Type B Vital Relays - Alstom

Type B Vital Relays 

Copyright © 1995, 1996, 2001, 2003, 2004, 2006, 2007 

Alstom Signaling Inc. 

B1 

B2 

Operation and Maintenance Manual 

P1457

Type B Vital Relays 

Copyright © 1995, 1996, 2001, 2003, 2004, 2006, 2007 


B1 

B2 

Operation and Maintenance Manual 


P1457, Rev. November 2007, Printed in U.S.A.

LIST OF EFFECTIVE PAGES 

P1457, Type B Vital Relays Operation and Maintenance Manual 

ORIGINAL ISSUE DATE: May 1995 

CURRENT REVISION AND DATE: November 2007 

CURRENT CHANGE AND DATE: November 2007 

− Update Biased-Neutral Relay Test Procedure 

PAGE 

Cover 

Title page 

Preface 

i thru viii 

CHANGE OR REVISION LEVEL 

Nov/07 

Nov/07 

Nov/07 

Nov/07 

1–1 thru 1–16 Nov/07 

2–1 thru 2–50 Nov/07 

3–1 thru 3–16 Nov/07 

4–1 thru 4–22 Nov/07 

5–1 thru 5–10 Nov/07 

6–1 thru 6–28 Nov/07 

7–1 thru 7–68 Nov/07 

A–1 thru A–16 Nov/07 

B–1 thru B–4 Nov/07 

C–1 thru C–8 Nov/07 

P1457, Rev. Nov/07 Alstom Signaling Inc.

THIS PAGE INTENTIONALLY LEFT BLANK. 


PREFACE 

NOTICE OF CONFIDENTIAL INFORMATION 

Information contained herein is confidential and is the property of Alstom 

Signaling Incorporated. Where furnished with a proposal, the recipient 

shall use it solely to evaluate the proposal. Where furnished to customer, it 

shall be used solely for the purposes of inspection, installation or 

maintenance. Where furnished to a supplier, it shall be used solely in the 

performance of the contract. The information shall not be used or 

disclosed by the recipient for any other purposes whatsoever. 

FOR QUESTIONS AND INQUIRIES, CONTACT CUSTOMER SERVICE AT 

1–800–717–4477 

OR 

WWW.ALSTOMSIGNALINGSOLUTIONS.COM 

ALSTOM SIGNALING INC. 

1025 JOHN STREET 

WEST HENRIETTA, NY 14586 

REVISION LOG 

Revision Date Description By Checked Approved 

0 May 1995 Original Issue 

1 March 1996 Update illustrations JF RD NI 

2 October 2001 Update illustrations JF RD NI 

3 September 2003 Update parts TS RD NI 

4 April 2004 Update style MAS RD NI 

5 September 2006 Update Installation 

Procedure, Appendix 

A, Parts Catalog and 

style; add AC 

Microchron II Timer 

Relay and Appendix C 

MAS RD 

JP 

NI 

6 November 2007 Update Biased-Neutral 

Relay Test Procedure 

MAS MR NI 




ABOUT THE MANUAL 

This manual is intended to provide the necessary information to maintain and ensure 

proper operation of Alstom Type B Vital Relays. 

The information in this manual is arranged into sections. The title and a brief description 

of each section follow: 

Section 1 – GENERAL DESCRIPTION: This section gives general information on the 

components of Alstom Type B Vital Relays. 

Section 2 – THEORY OF OPERATION: This section gives general information on the 

operation of Alstom Type B Vital Relays. 

Section 3 – INSTALLATION: This section describes the field installation and setup of 

Alstom Type B Vital Relays. 

Section 4 – PREVENTIVE MAINTENANCE: This section describes the preventive 

maintenance procedures performed on Alstom Type B Vital Relays. 

Section 5 – TROUBLESHOOTING: This section describes possible failures/symptoms 

along with the corrective action for Alstom Type B Vital Relays. 

Section 6 – PREVENTIVE MAINTENANCE: This section describes the testing and 

adjustment procedures associated with corrective maintenance of Alstom Type B Vital 

Relays. 

Section 7 – PARTS CATALOG: This section identifies and lists the spare parts 

associated with Alstom Type B Vital Relays. 

Appendix A – RELAY ENGINEERING DATA (ED) SHEET LIST: This section identifies 

the engineering data sheets for Alstom Type B Vital Relays. 

Appendix B – GLOSSARY: This section contains a glossary of terms used in this 

manual. 

Appendix C – TOOLS AND KITS: This section summarizes the tools and tool kit used 

for B relay installation, maintenance, and troubleshooting. 




MANUAL SPECIAL NOTATIONS 

In the Alstom manuals, there are three methods used to convey special informational 

notations to the reader. These notations are warnings, cautions, and notes. Both 

warnings and cautions are readily noticeable by boldface type two lines beneath the 

caption. 

Warning 

A warning is the most important notation to heed. A warning is used to tell the reader 

that special attention needs to be paid to the message because if the instructions or 

advice is not followed when working on the equipment then the result could be either 

serious harm or death. The sudden, unexpected operation of a switch machine, for 

example, or the technician contacting the third rail could lead to personal injury or death. 

An example of a typical warning notice follows: 

Caution 

WARNING 

DISCONNECT MOTOR ENERGY WHENEVER WORKING ON SWITCH 

LAYOUT OR SWITCH MACHINE. UNEXPECTED OPERATION OF 

MACHINE COULD CAUSE INJURY FROM OPEN GEARS, ELECTRICAL 

SHOCK, OR MOVING SWITCH POINTS. 

A caution statement is used when an operating or maintenance procedure, practice, 

condition, or statement, which if not strictly adhered to, could result in damage to or 

destruction of equipment. A typical caution found in a manual is as follows: 

Note 

CAUTION 

Turn power off before attempting to remove or insert circuit boards into a 

module. Boards can be damaged if power is not turned off. 

A note is normally used to provide minor additional information to the reader to explain 

the reason for a given step in a test procedure or to provide a background detail. An 

example of the use of a note follows: 

NOTE 

A capacitor may be mounted on the circuit board with a RTV adhesive. 

Use the same color RTV. 




Topic 

TABLE OF CONTENTS 

Page 

1. SECTION 1 – GENERAL DESCRIPTION ........................................................1–1 

1.1. INTRODUCTION TO VITAL RELAYS .........................................................1–1 

1.2. RELAY CHARACTERISTICS AND COMPONENTS...................................1–2 

1.2.1. Size .........................................................................................................1–2 

1.2.2. Identification ............................................................................................1–3 

1.2.3. Relay Prongs and Plugboard...................................................................1–5 

1.2.4. Mounting..................................................................................................1–7 

1.2.5. Registration .............................................................................................1–8 

1.2.6. Insulators.................................................................................................1–9 

1.2.7. Terminals...............................................................................................1–10 

1.2.8. Guide Rods............................................................................................1–14 

1.2.9. Wiring ....................................................................................................1–14 

1.2.10. Relay Contacts ......................................................................................1–15 

1.2.11. Coils ......................................................................................................1–15 

2. SECTION 2 – THEORY OF OPERATION........................................................2–1 

2.1. GENERAL ...................................................................................................2–1 

2.2. RELAY CONTACTS AND COILS................................................................2–3 

2.2.1. Definitions................................................................................................2–3 

2.2.2. Contact Groups .......................................................................................2–3 

2.2.3. Coils ........................................................................................................2–9 

2.3. BIASED-NEUTRAL TRACK RELAYS .......................................................2–13 

2.4. DC LINE RELAYS .....................................................................................2–15 

2.4.1. Neutral Line Relay .................................................................................2–15 

2.4.2. Biased-Neutral Line Relay.....................................................................2–16 

2.4.3. Magnetic-Stick Line Relay .....................................................................2–18 

2.4.4. Microchron II Timer Relays....................................................................2–21 

2.5. DC SPECIAL PURPOSE RELAYS............................................................2–29 

2.5.1. Highway Crossing Signal Flasher Relay................................................2–29 

2.5.2. Power-Transfer Relay............................................................................2–30 

2.5.3. Lamp-Control Relay...............................................................................2–32 

2.5.4. Switch-Overload Relay ..........................................................................2–33 

2.5.5. Code-Responsive Relay........................................................................2–34 

2.5.6. Code Rate Transmitter Relay ................................................................2–37 

2.5.7. Code-Following, VTB Relay...................................................................2–39 

2.6. AC TRACK RELAYS .................................................................................2–44 

2.6.1. Vane Relay............................................................................................2–44 

3. SECTION 3 – INSTALLATION.........................................................................3–1 

3.1. GENERAL ...................................................................................................3–1 

3.2. RELAY INSTALLATION TOOLS AND SUPPLIES ......................................3–1 

3.3. INSPECTION...............................................................................................3–1 

3.4. INSTALLATION ...........................................................................................3–2 

P1457, Rev. Nov/07 i Alstom Signaling Inc.

Topic 

TABLE OF CONTENTS (CONT.) 

Page 

4. SECTION 4 – PREVENTIVE MAINTENANCE .................................................4–1 

4.1. GENERAL ...................................................................................................4–1 

4.2. PREVENTIVE MAINTENANCE INTERVALS ..............................................4–2 

4.3. PREVENTIVE MAINTENANCE TOOLS......................................................4–3 

4.4. RELAY INSPECTION..................................................................................4–3 

4.5. ELECTRICAL TESTS..................................................................................4–9 

4.5.1. AC Light-Out Relay Test........................................................................4–11 

4.5.2. AC Vane Relay Test ..............................................................................4–12 

4.5.3. Biased-Neutral Relay Test.....................................................................4–13 

4.5.4. Code-Responsive Relay Test ................................................................4–14 

4.5.5. Code Rate Transmitter Relay Test ........................................................4–15 

4.5.6. Magnetic-Stick Relay Test.....................................................................4–16 

4.5.7. Microchron II Timer Relay Test..............................................................4–17 

4.5.8. Neutral Relay Test.................................................................................4–18 

4.5.9. Polarized Relay Test .............................................................................4–19 

4.5.10. Power-Transfer Relay Test....................................................................4–20 

4.5.11. Switch-Overload Relay Test ..................................................................4–21 

4.6. TIMING TESTS .........................................................................................4–22 

4.6.1. Code Rate Transmitter Relay Timing Test ............................................4–22 

4.6.2. Microchron II Timer Relay (DC) Timing Test .........................................4–22 

4.6.3. AC Microchron II Timer Relay Timing Test............................................4–22 

5. SECTION 5 – TROUBLESHOOTING...............................................................5–1 

5.1. GENERAL PHILOSOPHY ...........................................................................5–1 

5.2. GENERAL TROUBLESHOOTING ..............................................................5–1 

5.3. RELAY TROUBLESHOOTING TOOLS.......................................................5–1 

5.4. FIELD TROUBLESHOOTING .....................................................................5–2 

5.4.1. DC Relay Troubleshooting.......................................................................5–4 

5.4.2. AC Vane Relay Troubleshooting .............................................................5–6 

5.4.3. Microchron II Timer Relay Troubleshooting.............................................5–8 

6. SECTION 6 – CORRECTIVE MAINTENANCE ................................................6–1 

6.1. GENERAL PURPOSE.................................................................................6–1 

6.2. CORRECTIVE MAINTENANCE TOOLS.....................................................6–2 

6.3. REMOVAL AND REPLACEMENT PROCEDURES.....................................6–2 

6.3.1. B Relay Removal and Replacement........................................................6–2 

6.4. WIRING AND PLUGBOARD CHANGES.....................................................6–6 

6.4.1. Terminal Removal and Installation ..........................................................6–6 

6.4.2. Terminal Wiring .......................................................................................6–8 

6.4.3. Insulator Removal and Installation.........................................................6–10 

6.4.4. Current Test Terminal Wiring.................................................................6–11 

6.4.5. Voltage Test Terminal Wiring ................................................................6–12 

P1457, Rev. Nov/07 ii Alstom Signaling Inc.

Topic 

TABLE OF CONTENTS (CONT.) 

Page 

6.5. MECHANICAL TEST PROCEDURES.......................................................6–13 

6.5.1. Relay Structure Inspection ....................................................................6–14 

6.5.2. Mechanical Test and Adjustment Procedure .........................................6–17 

6.5.3. Microchron II Timer Relay Electronics Removal and Replacement .......6–23 

7. SECTION 7 – PARTS CATALOG ....................................................................7–1 

7.1. GENERAL ...................................................................................................7–1 

7.2. PARTS LIST................................................................................................7–1 

7.3. B1 NEUTRAL RELAYS ...............................................................................7–2 

7.4. B1 BIASED-NEUTRAL RELAYS .................................................................7–3 

7.5. B1 CODE-RESPONSIVE RELAY................................................................7–7 

7.6. B1 SLOW PICKUP, SLOW-RELEASE AND QUICK CROSSOVER 

RELAYS ....................................................................................................7–14 

7.7. B1 ELECTRONICALLY DRIVEN HIGHWAY CROSSING RELAY AND FLASHER 

MODULE ...................................................................................................7–15 

7.8. B2 NEUTRAL RELAY................................................................................7–18 

7.9. B2 BIASED-NEUTRAL RELAY .................................................................7–21 

7.10. B2 AC VANE RELAY, 2F-2B, TWO POSITION.........................................7–24 

7.11. B2 AC VANE RELAY, 4F-4B, TWO POSITION.........................................7–27 

7.12. B2 CODE RATE TRANSMITTER RELAY .................................................7–30 

7.13. B2 MICROCHRON II TIMER RELAY (DC)................................................7–36 

7.14. B2 AC MICROCHRON II TIMER RELAY ..................................................7–41 

7.15. TYPE VTB POLAR-BIASED RELAY .........................................................7–45 

7.16. B RELAY CONTACT GROUPS.................................................................7–54 

7.17. B RELAY PLUGBOARDS AND INSTALLATION SUPPLIES ....................7–58 

7.18. B RELAY REGISTRATION PLATES AND GASKETS...............................7–65 

A. APPENDIX A – RELAY ENGINEERING DATA (ED) SHEET LIST ................ A–1 

A.1. GENERAL ...................................................................................................A–1 

B. APPENDIX B - GLOSSARY............................................................................ B–1 

B.1. CONTACT DEFINITIONS............................................................................B–1 

B.2. GENERAL DEFINITIONS............................................................................B–2 

C. APPENDIX C – TOOLS AND KITS................................................................. C–1 

C.1. GENERAL .................................................................................................. C–1 

C.2. CORRECTIVE MAINTENANCE TOOLS AND TOOL KITS........................ C–1 

C.3. SHOP TEST RACK .................................................................................... C–5 

C.4. VANE RELAY TEST UNIT.......................................................................... C–6 

P1457, Rev. Nov/07 iii Alstom Signaling Inc.

Description 

LIST OF FIGURES 

Page 

Figure 1–1. Alstom Type B1 and Type B2 Type Vital Relays..................................... 1–1 

Figure 1–2. B1 Relay Nameplate, Nametag and Test Data Form .............................. 1–3 

Figure 1–3. Example B1 Relay Test Data Form......................................................... 1–4 

Figure 1–4. Plug Connection...................................................................................... 1–5 

Figure 1–5. B1 Plugboard .......................................................................................... 1–6 

Figure 1–6. Type B Plug Connections........................................................................ 1–7 

Figure 1–7. Registration Plates .................................................................................. 1–8 

Figure 1–8. Latching Insulator.................................................................................... 1–9 

Figure 1–9. Insulator Separates One Contact Terminal From the Other.................. 1–10 

Figure 1–10. Current Test Terminal ......................................................................... 1–11 

Figure 1–11. Voltage Test Terminal ......................................................................... 1–11 

Figure 1–12. Terminal Numbering of Type B, Size 1 (B1) DC Relays...................... 1–12 

Figure 1–13. Terminal Numbering of Type B, Size 2 (B2) DC Relays...................... 1–13 

Figure 1–14. B1 Relay showing Guide Rods and Nuts ............................................ 1–14 

Figure 1–15. Relay Contact Components ................................................................ 1–15 

Figure 1–16. Coil Terminal Numbers, B1 and B2 Relay (Rear View) ....................... 1–16 

Figure 2–1. Typical B1 Relay Components ................................................................ 2–2 

Figure 2–2. Heel Contact Engaging Pusher ............................................................... 2–4 

Figure 2–3. Three Different Contact Combinations .................................................... 2–4 

Figure 2–4. 2 Front (F) and 1 Back (B) Independent Regular Contacts ..................... 2–6 

Figure 2–5. 2 Front-Back (FB) Dependent Regular Contacts..................................... 2–6 

Figure 2–6. 2 Front-Back (FB) Dependent Heavy-Duty Contacts .............................. 2–7 

Figure 2–7. One Front and One Back Independent Heavy-Duty Contacts with Magnetic 

Blowouts................................................................................................................ 2–8 

Figure 2–8. Coil Construction, One Winding .............................................................. 2–9 

Figure 2–9. Coil Construction, Two Windings ............................................................ 2–9 

Figure 2–10. Type B1 Biased-Neutral Relay, Pre-1991 Cover................................. 2–13 

Figure 2–11. Type B1 Biased-Neutral Relay, Post-1991 Cover ............................... 2–13 

Figure 2–12. Typical B1 Track Relay Wiring ............................................................ 2–14 

Figure 2–13. B1 and B2 Neutral Line Relays Wiring ................................................ 2–15 

Figure 2–14. Voltage of Right Polarity Applied......................................................... 2–16 

Figure 2–15. No Voltage Applied.............................................................................. 2–17 

Figure 2–16. Voltage of Wrong Polarity Applied....................................................... 2–17 

Figure 2–17. Magnetic-Stick Relay, Reverse Position.............................................. 2–18 

Figure 2–18. Armature Picked Up with Normal Polarity ........................................... 2–19 

Figure 2–19. Armature Held Up By Permanent Magnet's Attraction ........................ 2–19 

Figure 2–20. Armature Knocked Down with Reverse Polarity.................................. 2–20 

Figure 2–21. B1 Magnetic-Stick Relay Wiring .......................................................... 2–20 

Figure 2–22. Microchron II Timer Relay Cover......................................................... 2–21 

Figure 2–23. Relay Contacts, Front View................................................................. 2–25 

Figure 2–24. AC Microchron II Timer Relay Schematic............................................ 2–25 

Figure 2–25. AC Motor Timer Plugboard Wiring Diagram ........................................ 2–27 

Figure 2–26. Electronically-Driven Flasher Relay Wiring ......................................... 2–29 

P1457, Rev. Nov/07 iv Alstom Signaling Inc.

Description 

LIST OF FIGURES (CONT.) 

Page 

Figure 2–27. Type S1/4 Half-Wave Rectifier for Power-Transfer Relay ................... 2–30 

Figure 2–28. Power-Transfer Relay Wiring .............................................................. 2–31 

Figure 2–29. Lamp-Control Relay Wiring ................................................................. 2–32 

Figure 2–30. Switch-Overload Relay Wiring............................................................. 2–33 

Figure 2–31. Code-Responsive Relay De-energized ............................................... 2–34 

Figure 2–32. Code-Responsive Relay Energized..................................................... 2–35 

Figure 2–33. Code-Responsive Relay Wiring .......................................................... 2–36 

Figure 2–34. Code Rate Transmitter Relay Operation ............................................. 2–37 

Figure 2–35. Code Rate Transmitter Relay Wiring................................................... 2–38 

Figure 2–36. VTB Plugboard.................................................................................... 2–39 

Figure 2–37. Polar-Biased Single Armature Relay................................................... 2–40 

Figure 2–38. VTB Relay Energized.......................................................................... 2–41 

Figure 2–39. VTB Relay, Two Armatures De-energized .......................................... 2–41 

Figure 2–40. VTB Relay, Two Armatures Energized................................................ 2–42 

Figure 2–41. VTB Relay Wiring................................................................................ 2–43 

Figure 2–42. Vane Relay Structure .......................................................................... 2–44 

Figure 2–43. Vane Relay Components .................................................................... 2–45 

Figure 2–44. Magnet Movement Drags the Metal Disc ............................................ 2–46 

Figure 2–45. Eddy Current Induction by Permanent Magnet ................................... 2–47 

Figure 2–46. Local and Track Current Cycles .......................................................... 2–48 

Figure 2–47. Parallel Hookup of Windings ............................................................... 2–49 

Figure 2–48. Series Hookup of Windings ................................................................. 2–50 

Figure 2–49. AC Vane Relay.................................................................................... 2–50 

Figure 4–1. Spanner Nut Wrench............................................................................... 4–3 

Figure 5–1. DC Relay Does Not Pick ......................................................................... 5–4 

Figure 5–2. DC Relay Does Not Release................................................................... 5–5 

Figure 5–3. AC Vane Relay Does Not Pick ................................................................ 5–6 

Figure 5–4. AC Vane Relay Does Not Release.......................................................... 5–7 

Figure 5–5. Microchron II Timer Relay (AC or DC) Does Not Pick............................. 5–9 

Figure 5–6. Microchron II Timer Relay (AC or DC) Does Not Release..................... 5–10 

Figure 7–1. B1 Neutral Relays ................................................................................... 7–2 

Figure 7–2. B1 Biased-Neutral Relays ....................................................................... 7–3 

Figure 7–3. B1 Code-Responsive Relay .................................................................... 7–7 

Figure 7–4. B1 Slow Pickup, Slow-Release and Quick Crossover........................... 7–14 

Figure 7–5. B1 Electronically Driven Highway Crossing Relay and Flasher Module 7–15 

Figure 7–6. B2 Neutral Relay ................................................................................... 7–18 

Figure 7–7. B2 Biased-Neutral Relay ....................................................................... 7–21 

Figure 7–8. B2 AC Vane Relay, 2F-2B, Two Position .............................................. 7–24 

Figure 7–9. B2 AC Vane Relay, 4F-4B, Two Position .............................................. 7–27 

Figure 7–10. B2 Code Rate Transmitter Relay ........................................................ 7–30 

Figure 7–11. B2 Microchron II Timer Relay (DC) ..................................................... 7–36 

P1457, Rev. Nov/07 v Alstom Signaling Inc.

Description 

LIST OF FIGURES (CONT) 

Page 

Figure 7–12. B2 AC Microchron II Timer Relay........................................................ 7–41 

Figure 7–13. Type VTB Polar-Biased Relay............................................................. 7–45 

Figure 7–14. B Relay Contact Groups...................................................................... 7–54 

Figure 7–15. B Relay Extra Heavy-Duty (EHD) Contact Group Magnet Detail ........ 7–55 

Figure 7–16. B Relay Plugboards and Installation Supplies..................................... 7–59 

Figure 7–17. Example Installation Supplies ............................................................. 7–60 

Figure 7–18. B Relay Registration Plates and Gaskets............................................ 7–66 

Figure C–1. Alstom B Relay Tools .............................................................................C–3 

Figure C–2. Shop Test Rack ......................................................................................C–5 

Figure C–3. Vane Relay Test Unit, Front Panel .........................................................C–6 

Figure C–4. Vane Relay Test Unit Circuit with Relay .................................................C–7 

P1457, Rev. Nov/07 vi Alstom Signaling Inc.

Description 

LIST OF TABLES 

Page 

Table 1–1. Relay Sizes and Weights.......................................................................... 1–2 

Table 1–2. Plugboard Dimensions ............................................................................. 1–5 

Table 2–1. Typical Relay Contact Combinations........................................................ 2–5 

Table 2–2. Coil Connections and Timing Characteristics ......................................... 2–11 

Table 2–3. AC Microchron II Timer Relay Operating Characteristics ....................... 2–26 

Table 2–4. Replaceable AC Motor Timers ............................................................... 2–28 

Table 3–1. B Relay Pre-Installation Inspection Procedure ......................................... 3–1 

Table 3–2. B Relay Installation Procedure ................................................................. 3–3 

Table 3–3. Microchron II Timer Relay (DC) Installation Procedure ............................ 3–7 

Table 3–4. Microchron II Timer Relay (DC) Surge Protection Installation 

Procedure............................................................................................................ 3–12 

Table 3–5. AC Microchron II Timer Relay Installation Procedure............................. 3–13 

Table 4–1. Preventive Maintenance Intervals ............................................................ 4–2 

Table 4–2. Typical B1 Relay Visual Inspection Procedure ......................................... 4–4 

Table 4–3. Vane Relay Visual Inspection Procedure ................................................. 4–6 

Table 4–3. Vane Relay Visual Inspection Procedure (Cont.) ..................................... 4–7 

Table 4–4. Microchron II Timer Relay Visual Inspection Procedure........................... 4–7 

Table 4–5. Miscellaneous Relay Visual Inspection Procedure ................................... 4–8 

Table 4–6. Electrical Test Procedures...................................................................... 4–10 

Table 4–7. AC Light-Out Relay Test Procedure ....................................................... 4–11 

Table 4–8. AC Vane Relay Test Procedure ............................................................. 4–12 

Table 4–9. Biased-Neutral Relay Test Procedure .................................................... 4–13 

Table 4–10. Code-Responsive Relay Test Procedure ............................................. 4–14 

Table 4–11. Code Rate Transmitter Relay Test Procedure...................................... 4–15 

Table 4–12. Magnetic-Stick Relay Test Procedure .................................................. 4–16 

Table 4–13. Microchron II Timer Relay Test Procedure........................................... 4–17 

Table 4–14. Neutral Relay Test Procedure .............................................................. 4–18 

Table 4–15. Polarized Relay Test Procedure........................................................... 4–19 

Table 4–16. Power-Transfer Relay Test Procedure ................................................. 4–20 

Table 4–17. Switch-Overload Relay Test Procedure................................................ 4–21 

Table 5–1. Troubleshooting Symbols ......................................................................... 5–3 

Table 6–1. Corrective Maintenance Procedures ........................................................ 6–1 

Table 6–2. B Relay Removal and Replacement Procedure ....................................... 6–2 

Table 6–3. Terminal Removal Procedure................................................................... 6–6 

Table 6–4. Terminal Installation Procedure................................................................ 6–7 

Table 6–5. Terminal Soldering Procedure.................................................................. 6–8 

Table 6–6. Terminal Crimping Procedure................................................................... 6–9 

Table 6–7. Insulator Removal and Installation Procedure ........................................ 6–10 

Table 6–8. Current Test Terminal Wiring Procedure................................................ 6–11 

P1457, Rev. Nov/07 vii Alstom Signaling Inc.

Description 

LIST OF TABLES (CONT.) 

Page 

Table 6–9. Voltage Test Terminal Wiring Procedure................................................ 6–12 

Table 6–10. Relay Structure Inspection Procedure.................................................. 6–14 

Table 6–11. Mechanical Test and Adjustment Procedure ........................................ 6–17 

Table 6–12. Microchron II Timer Electronics Removal Procedure ........................... 6–24 

Table 6–13. Microchron II Timer Electronics Replacement Procedure..................... 6–27 

Table 7–1. B Relay Drawings and Parts Lists ............................................................ 7–1 

Table 7–2. B1 Neutral and Biased-Neutral Relay Part Numbers................................ 7–4 

Table 7–3. B1 Code-Responsive Relay Part Numbers ............................................ 7–10 

Table 7–4. B1 Slow Pickup, Slow-Release, and Quick-Crossover and Electronically 

Driven Highway Crossing Relay and Flasher Part Numbers ............................... 7–16 

Table 7–5. B2 Neutral Relay Part Numbers ............................................................. 7–19 

Table 7–6. B2 Biased-Neutral Relay Part Numbers ................................................. 7–22 

Table 7–7. B2 Vane Relay, 2F-2B, Two Position Part Numbers .............................. 7–25 

Table 7–8. B2 Vane Relay, 4F-4B, Two Position Part Numbers .............................. 7–28 

Table 7–9. B2 Code Rate Transmitter Relay Part Numbers..................................... 7–32 

Table 7–10. B2 Microchron II Timer Relay Part Numbers ........................................ 7–38 

Table 7–11. B2 AC Microchron II Timer Relay Part Numbers .................................. 7–42 

Table 7–12. VTB Polar Biased Relay Part Numbers................................................ 7–46 

Table 7–13. B Relay Coil and Compression Spring Part Numbers .......................... 7–50 

Table 7–14. B Relay Contact Group Part Numbers ................................................. 7–56 

Table 7–15. B Relay Contact Group Pusher and Clip Part Numbers ....................... 7–57 

Table 7–16. B Relay Plugboard and Terminal Board Part Numbers ........................ 7–60 

Table 7–17. B Relay Registration Plate and Gasket Part Numbers ......................... 7–67 

Table A–1. ED sheets Listed By Catalog Number......................................................A–2 

Table A–2. ED sheets Listed By Drawing Number.....................................................A–9 

Table C–1. Alstom B Relay Tools...............................................................................C–1 

Table C–2. B Relay Tools Not Available From Alstom ...............................................C–4 

P1457, Rev. Nov/07 viii Alstom Signaling Inc.

General Description 

1. SECTION 1 – GENERAL DESCRIPTION 

1.1. INTRODUCTION TO VITAL RELAYS 

For over 70 years, Alstom Signaling, Inc. has continually perfected the Type B relays. 

They are the standard relay of the signaling industry. Types B and VTB plug-in relays 

meet applicable manual parts of American Railway Engineering and Maintenance of 

Way Association (AREMA). 

Alstom Type B plug-in relays are used in vital circuits, and are rack-installed in 

equipment rooms and in wayside cases and housings. These relays are divided into two 

sizes, B1 and B2, as shown in Figure 1–1. Some B relays are energized by DC voltage, 

others by AC voltage. A vital relay is designed so that the probability of its failing to 

return to a prescribed state when it is de-energized is so low that for all practical 

purposes it is considered to be nonexistent. 

ALS 

ALS 

B1 RELAY 

B2 RELAY 

Figure 1–1. Alstom Type B1 and Type B2 Type Vital Relays 

There are more than a dozen types of Type B relays, available in about 200 

configurations. They are designed to meet the important requirements of safety, 

reliability, low maintenance and long operating life. Replacement parts for relays 

decades old may still be available should it become necessary to extend their operating 

life. Alstom furnishes its customers relay application and adjustment instructions, either 

as part of a contract or upon request. 

P1457, Rev. Nov/07 1–1 Alstom Signaling Inc.


1.2. RELAY CHARACTERISTICS AND COMPONENTS 

1.2.1. Size 

Type B relays are made in two sizes, Size 1 and 2, and are referred to as B1 and B2 

relays. Two Size 1 relays occupy the same space as one Size 2 relay. Additionally, 

there is a special size relay, Type VTB code-responsive, which occupies the plugboard 

space for a B2 relay, but is not the same depth. Table 1–1 provides exact sizes and 

weights. 

Table 1–1. Relay Sizes and Weights 

Dimensions and Weights Size 1 Size 2 VTB 

Height of relay 6-5/16 in. 6-5/16 in. 7-11/16 in. 

Width of relay 2-7/16 in. 4-15/16 in. 4-15/16 in. 

Depth without plugboard 8-9/16 in. 8-9/16 in. 6-7/16 in. 

Depth including plugboard fully wired 

(approx.) 

15-1/2 in. 15-1/2 in. 13-3/8 in. 

Weight of relay with plugboard (weight of 

wiring not included) 

7 to 10 lbs. 10 to 15 lbs. 6 to 7 lbs. 

Weight of plugboard alone without wiring 1 lb. 2 lbs. 2 lbs. 



1.2.2. Identification 

All Type B relays carry nameplates that contain the drawing number (part number) and 

catalog number of the relay. Relay drawing number is also shown on the registration 

plates of the relay. When inquiring about a particular relay, always provide the catalog 

or drawing number. 

The drawing and catalog numbers can be used with the tables in Appendix A to look up 

the relay's Engineering Data (ED) Sheet number. The ED sheet contains technical 

specifications referenced during some maintenance procedures. 

Each B2 Relay has a Test Data Form on the cover and a name plate located inside the 

relay, visible from the front of the cover. 

Each B1 relay cover contains two recesses to allow attachment of two metalized 

polyester film or mylar tags with permanent adhesive: 

• a tag for relay operating and testing data 

• a tag for circuit nomenclature 

B1 Relays manufactured prior to 1991 have a different cover than those relays 

manufactured after 1991. The most obvious difference is the handle on the front of the 

relay. B1 relay nameplate, nametag and test data form locations for relays 

manufactured pre and post 1991 are shown in Figure 1–2. 

2 PIECE METAL 

HANDLE 

PLASTIC HANDLE 

MOLDED TO COVER 

NAMEPLATE 

NAMETAG 

TEST DATA 

FORM 

PRE 1991 STYLE 

POST 1991 STYLE 

Figure 1–2. B1 Relay Nameplate, Nametag and Test Data Form 



The information provided on the test data form includes the relay serial number, data 

from the specification sheet for the relay, the initials of the Alstom employee who tested 

the relay, and the date the form was completed. 

An example B1 relay test data form is shown in Figure 1–3. This example form includes 

the following: 

• Space 1 - The serial number as shown on relay nameplate. 

• Space 2 - The minimum DROP AWAY (D.A.) value from specification sheet in Amps 

for a DC relay or Volts for an AC relay. For example, on a 921-09 relay the space 

contains 0.077A for the minimum DROP AWAY. An "A" for Amps should be added 

or "VAC" for AC relays. 

• Space 3 - The maximum PICKUP (P.U.) value from specification sheet in the same 

style as in Space 2. 

• Space 4 - The maximum WORKING Current (W.C.) value from specification sheet in 

the same style as in Space 2. 

• Space 5 - The initials of the Alstom employee who tested the relay. 

• Space 6 - The date the form was completed in Month/Day/Year format (for example 

7/26/94). 

SERIAL NO. 

D.A.(MIN) 

P.U. (MAX) 

W.C. (MAX) 

INSP. 

1 

2 

3 

4 

5 6 

DATE 

Figure 1–3. Example B1 Relay Test Data Form 



1.2.3. Relay Prongs and Plugboard 

All Type B relays plug onto plugboards. Relay contacts and coil(s) are brought out 

through the base of the relay as prongs. The plugboard has wedge shaped plug 

insulators. There are two terminals per insulator, one on each side. The terminals are 

installed from behind the plugboard. See Figure 1–4 for a simplified mating diagram. For 

exact dimensions, see Table 1–2. 

TOP TERMINAL 

PLUGBOARD 

RELAY 

CONTACT 

BLOCK 

WIRES TO 

WIRE HARNESS 

RELAY 

SPRINGS 

INSULATOR 

SLIDING 

CONTACT 

BOTTOM 

PRONGS 

TERMINAL 

Figure 1–4. Plug Connection 

Table 1–2. Plugboard Dimensions 

Dimension B1 B2 

Overall Height 9-7/16 in. 9-7/16 in. 

Overall Width 2-1/2 in. 5 in. 

Overall Depth 10-1/2 in. 10-1/2 in. 

Diameter of mounting holes (clearance for 1/4 in. bolt) 9/32 in. 9/32 in. 

Vertical distance between centerlines of mounting holes 8-13/16 in. 8-13/16 in. 

There should be about a 5-inch clearance behind a plugboard to give room for wire 

distribution in a relay rack. 



When a relay is plugged in, two relay guide rods align the relay so that all prongs 

properly align with their corresponding insulators. The prongs slide onto their respective 

plugboard terminals, thus making contact. Figure 1–5 shows a B1 plugboard; including 

the location of the relay guide rods. 

Because plugboard terminals are connected to the wires in cables behind the 

plugboard, no wiring changes are necessary when replacing a Type B relay. 

TOP WIRE 

TERMINAL 

16 

15 

26 

25 

36 

35 

36 

35 

26 

25 

16 

15 

6 

5 

INSULATOR 

RELAY 

GUIDE 

RODS 

14 

13 

12 

11 

24 

23 

22 

21 

34 

33 

32 

31 

CONTACT 

TERMINALS 

34 

33 

32 

31 

3 

24 

23 

22 

21 

2 

14 

13 

12 

11 

1 

4 

3 

2 

1 

BOTTOM 

WIRE 

TERMINAL 

MALE 

REGISTRATION 

PLATE 

3A 

3B 

3C 

COIL 

TERMINALS 

3B 

3A 

3C 

3D 

3D 

1E 

3E 

TEST 

TERMINALS 

3E 

1E 

FRONT VIEW 

REAR VIEW 

Figure 1–5. B1 Plugboard 



1.2.4. Mounting 

The B relays plug on to plugboards. The contacts and the coil terminals of the relay 

protrude through the base of the relay as prongs. The plugboard has wedge-shaped 

plug insulators with flat metal terminals on the two faces of the wedge. Two rods guide a 

relay being plugged in, allowing the pairs of relay prongs to meet with corresponding 

wedges, spreading the prongs apart. The prongs slide onto the respective plugboard 

terminals making contact as shown in Figure 1–6. 

CONTACT BLOCK 

IN RELAY 

PLUGBOARD 

CONTACT PRONGS 

TERMINAL 

Figure 1–6. Type B Plug Connections 



1.2.5. Registration 

Registration plates prevent plugging a relay into the wrong place in a rack or module. 

Figure 1–7 shows two registration plates, one with holes, the other with pins. The plate 

with holes is attached to the base of the relay. The plate with pins is attached to the 

plugboard. If a relay that does not belong on the plugboard should be slipped on the 

guide rods, it is prevented from making contact with the terminals in the plugboard 

because the registration pins and holes do not correspond with one another. 

16 

15 

14 

13 

12 

11 

26 

25 

24 

23 

22 

21 

36 

35 

34 

33 

32 

31 

MALE 

REGISTRATION 

PLATE 

3A 

3B 

3C 

3D 

FEMALE 

REGISTRATION 

FEMALE 

REGISTRATION PLATE 

PLATE 

RELAY 

1E 

3E 

PLUGBOARD 

Figure 1–7. Registration Plates 



The registration feature takes care of six important differences in relays: 

• Differences in timing 

• Differences in contact arrangement 

• Differences in contact opening 

• Differences between track and line relays 

• Differences in coil resistance 

• Differences in coil arrangement 

1.2.6. Insulators 

Insulators are made of molded plastic and fit into slots in the plugboard. Each insulator 

is held in place by a locking latch molded into a spring beam on one side of the insulator 

as shown in Figure 1–8. An extractor tool must be used to remove the terminals prior to 

removing the insulators. To release the insulator so that it can be pulled out of the 

plugboard, squeeze the spring beam and push the insulator towards the front of the 

plugboard. 

There are 11 insulators in a B1 plugboard and up to 20 in a B2 plugboard. 

PLUGBOARD 

SPRING BEAM 

SQUEEZE TOWARDS 

INSULATOR TO RELEASE 

INSULATOR 

INSULATORS 

EXTRACTOR 

CRIMP WIRES TO 

TERMINAL CONNECTIONS 

Figure 1–8. Latching Insulator 

NOTE 

An integral beam latch secures the insulator to the plugboard. 



1.2.7. Terminals 

B relay plugboards contain contact terminals, coil terminals and test terminals as shown 

in Figure 1–5. There are two types of terminals, solder terminals and crimp terminals. 

Refer to Section 3, Installation, for installation supplies. 

1.2.7.1. Contact Terminals 

There are two contact terminals per insulator, one on the top and one on the bottom as 

shown in Figure 1–9. Each terminal is completely insulated from the adjacent one, by 

either the insulator or the wall of plastic material that surrounds each insulator and 

terminal assembly. 

TOP TERMINAL 

(SOLDER TYPE) 

RELAY CONTACT END 

TOP TERMINAL 

(CRIMP TYPE) 

INSULATOR 

WIRE CONNECTOR END 

BOTTOM TERMINAL 

(SOLDER TYPE) 

BOTTOM TERMINAL 

(CRIMP TYPE) 

Figure 1–9. Insulator Separates One Contact Terminal From the Other 

The terminal slips into place from behind the plugboard. First, the wire is connected to 

the terminal; then the terminal is pushed into the proper slot in the plugboard. 

On B1 plugboards, there are slots for 18 contact terminals for circuits through relay 

contacts and 4 for circuits through the coils. On B2 plugboards, there are slots for 36 

contact terminals and 4 coil terminals. 



1.2.7.2. Test Terminals 

A current test terminal is provided on the plugboard directly under the relay, as shown in 

Figure 1–10, to allow the checking of current flow through the relay coils. 

NOTE 

Not all relay plugboards are equipped with a current and voltage test 

terminal. 

FRONT 

PLUGBOARD 

HALF 

NUT 

TO CABLE 

HARNESS 

B2 

PLUGBOARD 

1E 

6E 

INSULATING 

BUSHING 

TERMINAL 

POST 

SPANNER 

NUT 

B1 

PLUGBOARD 

1E 

3E 

CURRENT TEST 

TERMINALS 

COPPER 

STRAP 

CURRENT TEST TERMINAL 

TO RELAY 

COIL TERMINAL 

CIRCUIT SYMBOL 

Figure 1–10. Current Test Terminal 

A voltage test terminal is provided on the plugboard next to the current test terminal, as 

shown in Figure 1–11, to allow the checking of voltage across the relay coils. 

FRONT 

TO CABLE 

HARNESS 

1E 

6E 

B2 PLUGBOARD 

TO COIL 

TERMINAL 

B1 PLUGBOARD 

1E 

3E 

VOLTAGE TEST TERMINAL 

CIRCUIT SYMBOL 

VOLTAGE TEST 

TERMINAL 

Figure 1–11. Voltage Test Terminal 



1.2.7.3. Numbering of Contacts and Plugboard Terminals 

From the front of the relay, the vertical columns of contacts and their plugboard 

terminals are numbered 1, 2, 3, etc. from left to right. The contact springs in each row 

are numbered from bottom to top 1, 2, 3, etc. These numbers are molded into the 

plugboard adjacent to the slots. Thus, all contact terminal numbers contain two digits, 

as shown in Figures 1–12 and 1–13. The first digit indicates the column; the second 

indicates the row. For example, terminal 36 is the third column from the left, sixth row 

from the bottom. The terminal 23 is the second column from the left, third row from the 

bottom. 

Only the springs with contacts are numbered. The stops and pressure plate springs are 

not numbered. 

16 

26 

36 

36 

26 

16 

6 

15 

25 

35 

35 

25 

15 

5 

14 

24 

34 

34 

24 

14 

4 

13 

12 

23 

22 

33 

32 

33 

32 

23 

22 

13 

12 

3 

2 

11 

21 

31 

31 

3 

21 

2 

11 

1 

1 

MALE 

REGISTRATION 

PLATE 

3A 

3B 

3C 

3B 

3A 

3C 

3D 

3D 

1E 

3E 

3E 

1E 

FRONT VIEW 

REAR VIEW 

Figure 1–12. Terminal Numbering of Type B, Size 1 (B1) DC Relays 



16 

26 

36 

46 

56 

66 

66 

56 

46 

36 

26 

16 

15 

14 

25 

24 

35 

34 

45 

44 

55 

54 

65 

64 

65 

64 

55 

54 

45 

44 

35 

34 

25 

24 

15 

14 

13 

23 

33 

43 

53 

63 

63 

53 

43 

33 

23 

13 

12 

22 

32 

42 

52 

62 

62 

52 

42 

32 

22 

12 

11 

21 

31 

41 

51 

61 

61 

51 

41 

31 

21 

11 

1C 

MALE 

REGISTRATION 

PLATE 

6C 

6C 

1C 

1D 

6D 

6D 

1D 

1E 

3E 

4E 

6E 

6E 

4E 

3E 

1E 

FRONT VIEW 

REAR VIEW 

Figure 1–13. Terminal Numbering of Type B, Size 2 (B2) DC Relays 



1.2.8. Guide Rods 

Two guide rods, which extend from the face of the plugboard 8-1/2 inches, help guide 

the relay into alignment with the insulators on the plugboard. 

Each rod has a knurled nut and a lock nut to secure the relay on its plugboard, as 

shown in Figure 1–14. 

LOCK NUTS 

GUIDE RODS 

KNURLED 

NUTS 

Figure 1–14. B1 Relay showing Guide Rods and Nuts 

1.2.9. Wiring 

Wires strapped together in cable form are supported behind the plugboard. Each wire is 

identified with a tag and then connected to its terminal. The terminal is pushed into its 

slot in the plugboard and locked in place. 

The plugboard back can accommodate the mounting of a two-post terminal block as 

shown in Figure 1–16. This can be used to terminate coil leads where coils in a relay 

are circuited independent of one another. 



1.2.10. Relay Contacts 

Relays are furnished with specific contact arrangements. In all relays, the contacts are 

leaf springs molded in blocks. Each block is called a contact group. One end of the 

spring is formed into a prong, which makes contact with the plugboard terminal. The 

other end has a contact. Figure 1–15 shows a typical configuration of the relay contact 

components. 

FRONT 

CONTACT 

PRESSURE 

PLATE 

PLUGBOARD 

CONTACTS 

HEEL 

STOP 

PLATE 

Figure 1–15. Relay Contact Components 

1.2.11. Coils 

On B1 and B2 DC relays, there is space enough on each of the two cores for one fulllength 

coil, approximately 4 inches long. Coils shorter than this are used when the cores 

are partly filled with copper or aluminum washers or slugs for use in slow-acting relays. 

1.2.11.1. Identifying Coil Leads 

The two leads of a coil are designated as "in" and "out" leads. From the prong end of a 

coil, the IN lead is attached to the prong that is closer to the center of the coil. The OUT 

lead is attached to the prong furthest from the center. 

If a coil has two windings, the winding nearer the prongs is connected to the prongs. 

Leads of the second winding are tagged and have terminals applied. 



1.2.11.2. Numbering of Coil Terminals 

Two digit coil terminal identifiers consisting of a number and a letter are molded in the 

phenolic plugboard. The number is taken from the vertical row in which the terminal is 

located. The letter shows its position in that row. Letter A is given to the highest 

terminal, letter D to the lowest terminal for B relays. Letter E is use to designate test 

terminals. See Figure 1–16. 

3A 

1C 

COIL 

TERMINALS 

3B 

3D 

3C 

1D 

SPARE TERMINAL 

BLOCK 

(P/N 46048-053-01) 

IF SO EQUIPPED 

6D 

6C 

1C 

1D 

COIL 

TERMINALS 

3E 

1E 

TEST 

TERMINALS 

6E 

1E 

TEST 

TERMINALS 

B1 

B2 

Figure 1–16. Coil Terminal Numbers, B1 and B2 Relay (Rear View) 


Theory of Operation 

2. SECTION 2 – THEORY OF OPERATION 

2.1. GENERAL 

This section covers the functions of Alstom Type B relays. 

B relays contain various arrangements of contacts and coils. Information is presented 

as follows: 

• Relay Contacts and Coils 

• B1 Relays 

• B2 Relays 

Figure 2–1 identifies typical B1 relay components. Some type B2 relays look very 

similar to the typical B1 relay shown, others do not. See the B2 relay discussions for 

relay descriptions. 



COMPRESSION SPRING 

COVER 

COIL SPRING STUD 

ARMATURE STOP SCREW 

BRIDGE OR ARM. EXTENSION 

PUSHER 

BACK CONTACT 

HEEL CONTACT 

FRONT CONTACT 


BASE 

CONTACT GROUP 

PRESSURE PLATES 

STOP PLATES 

PUSHER JAW 

PUSHER RETAINING CLIPS 

ROLLER ON FINGER 

ARMATURE 

ARMATURE 

RETAINING 

PLATE 

ADJ. NUT 

LOCK NUT 

YOKE 

NUT 

ARMATURE 

BEARING 

PLATE 

NAME 

PLATE 

SAFETY 

PIN 

COIL 

REGISTRATION COIL 

PLATES PRONGS 

ADJUSTABLE RESIDUAL SCREW 

CORE 

NOTE: SOME PARTS MAY DIFFER IN DETAIL FROM THOSE SHOWN ABOVE BUT NAME 

DESIGNATION REMAINS THE SAME. 

Figure 2–1. Typical B1 Relay Components 



2.2. RELAY CONTACTS AND COILS 

2.2.1. Definitions 

The following terms are used in the descriptions of how relay contacts operate: 

• Front -Relay contact that is open when relay is de-energized. 

• Heel - Contact that is driven by pusher. 

• Back - Relay contact that is made when relay is de-energized (normally closed). 

• Make - Specified dimension that will cause all front or back contacts to be just made 

(closed) when a gauge of the specific dimension is inserted between the armature 

residual screw and core face with the relay energized. 

• Break - All front or back contacts are just open when a gauge of a specific 

dimension is inserted between the armature residual screw and the core face with 

the relay de-energized. 

• Break-before-make - In a dependent front-heel-back contact, the back contact will 

break before the front contact makes as the relay is energized. 

• Makes-before-break - In a dependent front-heel-back contact, the front contact will 

make before the back contact breaks. 

A complete glossary of terms used in this manual is available in Appendix B. 

2.2.2. Contact Groups 

There are typically six springs per contact group, furnished in various combinations of 

contacts. The AC Vane Relay contact groups contain four springs. 

Springs are furnished for each group in various combinations of contacts. For example, 

a contact group can have two dependent front-back (FB) contacts or three independent 

contacts (front or back). 

• A dependent FB contact uses three springs, one for the stationary front (F), one for 

the stationary back (B), and one for the movable heel. 

• An independent contact uses two springs, one for the stationary contact (front or 

back), and one for the movable heel. 



The relay armature, as shown in Figure 2–2, has a bridge attached to it, which engages 

a pusher. The pusher engages a roller on the heel contact to move the heel contact up 

or down in response to the movement of the relay armature. 

HEEL CONTACT 

ROLLER 

ARMATURE 

BRIDGE 

PUSHER 

Figure 2–2. Heel Contact Engaging Pusher 

Typical contact groups are shown in Figure 2–3. 

2 Front-Back (FB) Dependent Contacts 1 Front (F) 2 Back (B) Independent Contacts 

3 Back (B) Independent Contacts 

Figure 2–3. Three Different Contact Combinations 



2.2.2.1. Contact Combinations 

A B1 relay has space for three contact groups. For example, a relay with 6 front-back 

dependent contacts has three groups, each with 2 front-back contacts. A relay with 4 

front-back dependent contacts and 2 front and 1 back independent contacts also has 

three groups, two with 2 front-back dependent contacts, and one with 2 front and 1 back 

independent contacts. 

A typical B2 relay has space for six contact groups. For example, a relay with 12 frontback 

contacts has six groups, each with 2 front-back contacts. The B2 AC Vane relay 

has a different configuration with space for four contact groups. 

Table 2–1 shows the contact combinations normally furnished with B relays. For the 

configuration of specific arrangements, see Section 7. 

Table 2–1. Typical Relay Contact Combinations 

Type 

B1 Relays 

(3 Contact Groups) 

B2 Relays 


B2 Vane Relays 


Neutral 2FB, 4FB, 4F-2B, 12FB 

4FB-2F-1B, 6FB 

Biased-Neutral 4FB-2F-1B, 6FB 8FB-4F-2B, 12FB 

Magnetic-Stick 4 NR 

Power-Transfer 2FB, 6FB 

Light-Out 4FB, 4F-2B, 6FB 

AC Vane 

2FB, 4FB 

FB 

Front-Back Dependent Contact 

F 

Front Independent Contact 

B 

Back Independent Contact 

NR 

Normal-Reverse Dependent Contact 



2.2.2.2. Regular Contacts 

Contacts for regular service are rated for a resistance load of 4 amperes continuously. 

Front contacts are silver-impregnated-carbon to silver; back contacts are silver to silver. 

See Figures 2–4 and 2–5. 

FRONT CONTACT SILVER 

IMPREGNATED CARBON 

HEEL SILVER 

BACK CONTACT SILVER 

Figure 2–4. 2 Front (F) and 1 Back (B) Independent Regular Contacts 

Figure 2–5. 2 Front-Back (FB) Dependent Regular Contacts 



2.2.2.3. Heavy-Duty Contacts 

Heavy-duty contacts, shown in Figure 2–6, are commonly used in circuits of the first and 

second voltage ranges where the continuous resistive load current is more than four 

amperes. The first voltage range is 30 volts or less; the second voltage range is over 30 

volts to 175 volts inclusive. Front contacts are usually Silver-Impregnated-Carbon to 

Silver; back contacts are Silver to Silver. 

For the rating of contacts on relays containing heavy-duty (HD) contacts consult the 

specific relay's Engineering Data (ED) sheet. 

Figure 2–6. 2 Front-Back (FB) Dependent Heavy-Duty Contacts 



2.2.2.4. Contacts with Magnetic Blowouts 

Heavy-duty contacts equipped with magnetic blowouts, shown in Figure 2–7, are 

generally used in d-c circuits carrying inductive loads where the continuous current is 

more than four amperes and where operation is in the second or third voltage ranges. 

The third voltage range is over 175 volts to 250 volts inclusive. 

For the rating of contacts on relays containing heavy-duty contacts with blowout 

magnets (XHD) consult the specific relay's Engineering Data (ED) sheet. 

MAGNETIC 

BLOWOUT 

MAGNETIC 

BLOWOUT 

Figure 2–7. One Front and One Back Independent Heavy-Duty Contacts 

with Magnetic Blowouts 

Both front and back contacts are the heavy-duty type just described. Magnets are held 

in clips close to the contacts. The effect is to "blow" or disperse the electric arc before it 

has a chance to grow and burn. The front contact opening is usually 0.125” minimum for 

this type of contact. 

Using magnetic blowout contacts sacrifices the space of one contact group in the relay. 



2.2.3. Coils 

A coil may be made up of one or more separate windings, leads from these windings 

being fastened to prongs that engage with the plugboard terminals or to terminals that 

go on a binding post within the relay. See Figures 2–8 and 2–9. 

A typical coil is wound on a phenolic spool that slips over one core of the relay. Every 

coil is identified with its drawing number and nominal resistance. 

IN 

WINDING DIAGRAM 

OUT 

IN 

OUT 

CAP REMOVED 

CAP 

Figure 2–8. Coil Construction, One Winding 

"IN" FOR "A" WINDING 

"A" 

"B" 

"IN" FOR "B" WINDING 

"OUT" FOR "A" WINDING 

"OUT" FOR "B" WINDING 

"A" 

WINDING 

"B" 

WINDING 

WINDING DIAGRAM 

CAP 

IN 

OUT 

LEADS FOR "B" WDG. 

CAP REMOVED 

Figure 2–9. Coil Construction, Two Windings 



2.2.3.1. One-Coil Relays (Slow Acting Relays) 

One core of a relay can be completely filled with copper washers or a slug of aluminum 

or copper to make the relay slow acting. In this case, only one coil is used to operate 

the relay. The more washers used, or the longer the slug, the slower the relay operates. 

If the relay is to be slightly slow acting, short coils on the cores usually provide enough 

room for the required number of washers or a short slug. If the relay is to be slower 

acting, one coil is put on the lower core and a slug is put on the upper core. 

The circuit of a one-coil B1 relay is shown in Table 2–2 (3A and 3B). The IN lead of the 

coil is connected to the 3C terminal on the plugboard; the OUT lead is connected to the 

3D terminal. Positive energy is applied through the current test terminal 3E to terminal 

3C. 

The circuit for a one-coil B2 relay is shown in Table 2–2 (3A and 3B). The IN lead of the 

coil is in contact with the 6C terminal on the plugboard; the OUT lead contacts the 6D 

terminal. Positive energy is applied through the current test terminal 6E to terminal 6C. 

B2 neutral relays with slugs are rarely used, as there is seldom the need for B2 slowrelease 

relays with such large contact capacity. 

2.2.3.2. Two-Coil Relays 

In two-coil B1 relays, the upper coil plugs onto terminals 3A and 3B of the plugboard, 

the lower coil onto terminals 3C and 3D. Connections between the coils are made on 

the back of the plugboard for series, parallel, or single coil operation. The circuits in 

Table 2–2 show these possibilities. 

In two-coil B2 relays, from the front of the relay, the left-hand coil plugs onto terminals 

1C and 1D, the right-hand coil onto terminals 6C and 6D. See Table 2–2 for a brief 

explanation of circuit description, timing characteristics and application notes. 


P1457, Rev. Nov/07 2–11 Alstom Signaling Inc. 

1 

Circuit 

B1 Relay B2 Relay 

E = 2 RI 

I 

– 

3A 

R 

R 

3D 

2 

3B 

3C 

E = (1/2r)(2I) 

2I 

– r 

3A 

r 

3B 

3D 3C 

3A 

– 

3B 

4 

– 

– 

3E 

3E 

3D 3C 3E + – 

3D 3C 3E 

3A 

3D 

3B 

3C 

3E 

+ 

+ 

+ – 

+ 

– 

1C R 

R 

6D 

– r 

1C r 

6D 

– 

Table 2–2. Coil Connections and Timing Characteristics 

1D 

6C 

1D 

6C 

6E 

6E 

6D 6C 6E 

+ 

6D 6C 6E 

1C 

6D 

1D 

6C 

+ 

+ 

+ 

+ 

6E 

Circuit 

Description 

Series 

Multiple 

One coil 

separating slugs 

on other core 

One coil 

separating slugs 

on other core 

Series with 

rectifier shunted 

across coils 

Timing 

Characteristics 

Pickup normal 

Release normal 

Pickup fast 

Release normal 

Release slow: up 

to as high as 

three (3) seconds 

Pickup slow: up 

to as high as 

three (3) seconds 

Pickup normal 

Release slow, 

but less slow 

than 3A or 3B 

Notes 

I = WORKING current 

R = resistance of one coil 

E = voltage required to get 

full pressure on the front 

contact 

Voltage across coils is one 

half (1/2) the voltage across 

the coils of item 1 above 

Timing is affected when 

controlled over line because 

of line drop 

Timing is affected when 

controlled over line because 

of line drop 

Do not use in circuits 

subject to lightning 

Do not energize from a 

battery whose other circuits 

are subject to lightning 

Theory of Operation


5 

6 

– 

– 

7 

– 

8 

9 

– 

– 

Circuit 

B1 Relay B2 Relay 

3A 

3D 

3A 

3D 

3A 

3D 

3A 

3D 

3A 

3D 

3B 

3C 

3B 

3C 

3B 

3C 

3B 

3C 

3B 

3C 

3E 

3E 

3E 

+ 

+ 

+ 

+ 

3E 

+ 

3E 

– 

– 

– 

– 

– 

Table 2–2. Coil Connections and Timing Characteristics (Cont.) 

1C 

6D 

6D 

1C 

6D 

1C 

1C 

6D 

1C 

6D 

1D 

+ 

6C 6E 

6C 

1D 

6C 

1D 

1D 

6C 

1D 

6C 

6E 

6E 

+ 

+ 

+ 

6E 

+ 

6E 

Circuit 

Description 

Multiple with 

rectifier shunted 

across coils 

One coil 

operating, one 

coil shunted 

One coil 

operating, one 

coil shunted 

when armature 

is picked up 

Series with 

resistor shunted 

across coils 

Series with 

resistor and 

capacitor 

shunted across 

coils 

Timing 

Characteristics 

Pickup fast 

Release slow, 

but less slow 

than 4 

Pickup slow 

Release slow, 

but less slow 

than 4 

Pickup normal 

Release slow, 

but less slow 

than 3A, 3B, or 4 

Pickup normal 

Release slow, 

but less slow 

than 3A, 3B, or 4 

Pickup normal 

Release slow, 

slower than 3A or 

3B, up to ten (10) 

seconds 

Notes 

Do not use in circuits 

subject to lightning 

Shunt should be applied to 

the lower coil of B1 relays to 

get the maximum slow 

release effect 

The lower the resistor, the 

slower the relay; takes more 

current, will therefore affect 

operation of any relays in 

series 

The greater the capacity of 

the capacitor, the slower the 

relay; a resistor should 

always be used in series in 

case the capacitor shorts 

Theory of Operation


2.3. BIASED-NEUTRAL TRACK RELAYS 

All biased-neutral track relays (B1 and B2) have normal pickup and release timing 

characteristics. Figures 2–10 and 2–11 illustrate typical B1 biased-neutral relays. 

Figure 2–10. Type B1 Biased-Neutral Relay, Pre-1991 Cover 

Figure 2–11. Type B1 Biased-Neutral Relay, Post-1991 Cover 



Figure 2–12 shows typical B1 relay wiring. 

2 WINDINGS IN PARALLEL 

(FRONT VIEW) 

16 

15 

14 

13 

12 

11 

26 

25 

24 

23 

22 

21 

36 

35 

34 

33 

32 

31 

UPPER COIL 

LOWER COIL 

I 

O 

I 

O 

3A 

3B 

3C 

3D 

(-) 

1E 

(+) 

3E 

PLUGBOARD JUMPERS 

TO PARALLEL COILS 

THICK WIRING IS PLUGBOARD WIRING. 

THIN WIRING IS RELAY WIRING. 

I ="IN" LEAD 

O = "OUT" LEAD 

Figure 2–12. Typical B1 Track Relay Wiring 

Another application of the biased-neutral function is in the DC high percentage release 

track relay that can be used in track circuits up to 20,000 feet long. With its low nominal 

resistance of 0.5 ohm (with coils connected in parallel), this B1 relay provides fast, high 

shunting sensitivity under poor ballast conditions while giving excellent protection 

against foreign current. In addition, this relay will not pick up when 50 times reverse 

polarity WORKING current is applied. 

The operation of a biased-neutral line relay is discussed under Heading 2.4.2. 



2.4. DC LINE RELAYS 

2.4.1. Neutral Line Relay 

Type B neutral line relays are made in both Size 1 and Size 2. They have normal pickup 

and release, are available as slow-release, slow pickup, and slow pickup and release. 

In the normal pickup and release relays, the coils are full length. In slow-release and 

slow pickup relays, coils of shorter lengths are used to make room for slugs on the 

cores. In relays where one coil only is used (a full-length slug being on the other core), 

the coil is usually placed on the lower core. Figure 2–13 shows coil connections. 

2 COILS IN SERIES 

B1 NEUTRAL 

(FRONT VIEW) 

2 COILS IN SERIES 

B2 NEUTRAL 

(FRONT VIEW) 

12 FRONT 

BACK SETS 

OF CONTACTS 

UPPER COIL 

LOWER COIL 

I 

O 

I 

O 

3A 

3B 

3C 

3D 

3E 

(–) 

1C 

(–) I 

1D 

PLUGBOARD 

O 

JUMPER 

TO SERIES COILS 

(+) 

I 

O 

6E 

6C 

6D 

(+) 

THICK WIRING IS PLUGBOARD WIRING 


I = "IN" LEAD 


Figure 2–13. B1 and B2 Neutral Line Relays Wiring 

Various resistances are available, but the nominal 500-ohm relay is recommended for 

most purposes. 



2.4.2. Biased-Neutral Line Relay 

The biased-neutral line relay is basically a relay with a neutral structure. It is, however, 

equipped with a permanent magnet and a leakage strip bridging the cores and placed 

between the coils and the armature. The effect on the operation is to allow the relay to 

pick up only if voltage of the proper polarity is applied. 

In other respects, the relay is essentially like a regular neutral relay. It is built in Sizes 1 

and 2. 

Figures 2–14 through 2–16 how the relay works. 

- 

S 

VOLTAGE OF 

CORRECT 

POLARITY 

+ 

N 

ARMATURE 

PICKS UP 

Figure 2–14. Voltage of Right Polarity Applied 



S 

NO VOLTAGE 

N 

ARMATURE 

DOES NOT 

PICK UP 

Figure 2–15. No Voltage Applied 

+ 

S 

VOLTAGE OF 

WRONG 

POLARITY 

- 

N 

ARMATURE 

DOES NOT 

PICK UP 

Figure 2–16. Voltage of Wrong Polarity Applied 



2.4.3. Magnetic-Stick Line Relay 

Magnetic-stick relays are commonly used in switch control and indication circuits. 

Magnetic-stick or "polar stick" relays operate by responding to a change in the direction 

of the current flow through their coils. The armature stays in its last operated position 

when energy is cut off. 

The armature is polarized by two permanent magnets. Internal nominal 150-ohm 

resistors can be connected by plugboard jumpers for operation on 2, 10 or 20 volts. 

Figures 2–17 through 2–20 show relay operation and different contact closures resulting 

from armature movement. Figure 2–21 depicts the normal wiring connections. 

R 

PUSHER 

N 

NORMAL 

CONTACTS 

OPEN 

S 

N 

NO VOLTAGE 

ARMATURE 

Figure 2–17. Magnetic-Stick Relay, Reverse Position 



R 

N 

NORMAL 

CONTACTS 

CLOSED 

S 

N 

RECOMMENDED 

VOLTAGE TO 

POSITION RELAY 

NORMAL 

Figure 2–18. Armature Picked Up with Normal Polarity 

NORMAL 

CONTACTS 

CLOSED 

R 

N 

S 

N 

NO VOLTAGE 

Figure 2–19. Armature Held Up By Permanent Magnet's Attraction 



R 

N 

REVERSE 

CONTACTS 

CLOSED 

S 

N 

RECOMMENDED 

VOLTAGE TO 

POSITION RELAY 

REVERSE 

Figure 2–20. Armature Knocked Down with Reverse Polarity 

(FRONT VIEW) 

16 26 36 

25 

24 

14 34 

13 23 33 

22 

21 

11 31 

NORMAL CONTACTS ARE 13, 16, 33 AND 36 

REVERSE CONTACTS ARE 11, 14, 31 AND 34 

FOR SERIES COIL CONFIGURATION AT 10 VOLTS, 

WITH + ON 21 AND - ON 26 AND 23 & 25 JUMPERED 

THE NORMAL CONTACTS CLOSE. 

WITH - ON 21 AND + ON 26 AND 23 & 25 JUMPERED 

THE REVERSE CONTACTS CLOSE. 

I 

O 

I 

O 

3E 


THIN WIRING IS INTERNAL RELAY WIRING. 

I = "IN" LEAD 


Figure 2–21. B1 Magnetic-Stick Relay Wiring 



2.4.4. Microchron II Timer Relays 

The ‘Microchron II® Timer’ is a timing relay mechanism consisting of a timing package 

and a relay assembly housed within a B2 relay enclosure. See Figure 2–22. 

abcd 

LED LOCATION 

(DC TIMER) 

Handle 

PCB SLOT 

LED LOCATION 

(AC TIMER) 

DC TIMER 

THUMBWHEEL CUTOUT 

AC TIMER 

THUMBWHEEL CUTOUT 

Figure 2–22. Microchron II Timer Relay Cover 

The Alstom relay identified as "Microchron II Timer Relay" is a DC relay. Alstom also 

manufactures the "AC Microchron II Timer Relay," an AC version. 

2.4.4.1. Fail-Safe Performance 

The Vital design of the Microchron II Timer Relay ensures that a time delay interval 

shorter than that selected cannot be performed. Component degradation or failure can 

only lead to a longer than selected time delay. 



2.4.4.2. Microchron II Timer Relay (DC) 

Designed to replace existing DC motor timers, the Microchron II Timer Relay possesses 

a delay range from 1 second to 19 minute and 59 seconds. The range is adjustable in 1- 

second increments. Delay is initiated once input power is applied. 

The timing package consists of two printed circuit boards that perform time select and 

voltage regulation/relay driver and delay processing operations. The front edge of the 

delay processor provides visual indications of the delay sequencing. Those provided 

include ‘DELAY COMPLETE’ and ‘TIMING/POWER ON’. The time selection is 

accomplished by removing the cover from in front of the thumbwheel select switch 

assembly and placing the thumbwheels in the desired position. 

Four wires run external to the timer assembly: two wires for input power, that are 

terminated on the relay contact block and two wires that are connected to the B relay 

coils on the relay assembly. Connections between the timer and relay assemblies are 

accomplished using pin and socket type connectors. 

The relay mechanism consists of a B1 neutral relay with two series connected coils 

each with a nominal DC resistance of 250 ohms. Contact configuration is 3 fronts (silver 

impregnated carbon to silver), 2 backs (silver to silver impregnated carbon), and 2 frontback 

(silver impregnated carbon to silver, silver to silver). 

The Microchron II Timer is normally de-energized. Once power is applied, the 

microprocessor begins the vital program. Initially vital functions are tested and data 

memory is checked for failures. Next, the time selected on the thumbwheel switches is 

scanned and appropriate delay counters are initialized. The delay sequence then 

begins. The ‘TIMING/POWER ON’ indicator flashes at one-second intervals as the 

delay proceeds. A signature analysis following completion of the delay is a final check 

that all operations have been properly performed. Successful performance of the 

signature analysis allows the program to enter the vital output routine that provides a 10 

kHz signal needed to energize the B relay. The indicator ‘DELAY COMPLETE’ is 

illuminated at that time. Slight illumination of the ‘TIMING/POWER ON’ indicator 

provides visual indication that power is being applied to the unit. 

2.4.4.2.1. Operating Specifications 

• Input voltage (DC) : 8V to 31.5 VDC 

• Maximum Current Draw: 0.100 Amps @ 15VDC Input 

• Relay Maximum PICKUP and WORKING Current: 0.0121 Amps 

• Relay Coil Resistance (series connected coils): 500 ohms (Nominal) 

• Operating Temperature: -40°C to +70°C 



2.4.4.2.2. Application Considerations 

Because the Microchron II timer design is different from that of the DC motor-operated 

timer, it always returns to the off position when energy is removed. Thus, it provides full 

“set” time from the instant energy is applied. Because of this characteristic, no backcheck 

contacts are required. 

The Microchron II timer, however, with back-check contacts facilitates its use as a 

replacement for the types B2 and KB motor timers without wiring changes. Two backcheck 

contacts are in plugboard positions 43-44 and 53-54, as on the Type B2 motoroperated 

timer. Two front contacts in plugboard positions 45-46 and 55-56, as on the 

Type B2 motor timer, also permit the Microchron II timer to be a replacement for Types 

B2 and KB timer relays if the following WARNING is obeyed: 

WARNING 

THE MICROCHRON II TIMER MAY NOT BE INTERCHANGEABLE WITH 

A MOTOR OPERATED TIMER IN EVERY CIRCUIT APPLICATION. 

DIFFERENCES IN OPERATION OF THE MOTOR TIMER BACK 

CONTACT REQUIRE CONSIDERATION OF THE CHECK CONTACT 

OPERATION IN THE SPECIFIC APPLICATION TO ENSURE THAT THE 

SAFETY PERFORMANCE OF THE CIRCUIT IS NOT COMPROMISED. 

BACK CONTACTS, OR CHECK CONTACTS, ON THE TYPE B2 AND KB 

MOTOR TIMERS OPEN AT THE BEGINNING OF THE TIMING CYCLE. 

BACK CONTACTS ON THE MICROCHRON II TIMER RELAY OPEN AT 

THE END OF THE TIMING CYCLE. 

WHILE IT IS DOUBTFUL THAT THERE IS A PROBLEM WITH THE 

MAJORITY OF CIRCUITS IN USE, AS AN ADDED SAFETY 

PRECAUTION TO PREVENT AN INADVERTENT SUBSTITUTION, THE 

MICROCHRON II TIMER RELAY HAS A REGISTRATION PLATE 

DIFFERENT FROM ANY OTHER TYPE B2 DC MOTOR TIMER. 



2.4.4.3. AC Microchron II Timer Relay 

The Alstom AC Microchron II Timer Relay is a vital time element relay unit consisting of 

a standard vital neutral relay structure and a solid-state timer. There are two versions of 

this unit. One version operates at 60 Hz and the other version operates at 25 Hz. This 

relay is referenced as the 25 Hz version in this manual. 

• The 60 Hz unit operates from a nominal 110 Volts root mean square (Vrms) AC at 

60 Hz power. 

• The 25 Hz unit operates from a nominal 55 Volts root mean square (Vrms) AC at 25 

Hz power. 

NOTE 

To assure safe application of the AC Microchron II Timer Relay 60 Hz unit, 

all application circuits must be reviewed by Alstom engineering before it 

will be approved for use. 

For both units, the timing range can be set from 1.0 seconds to 19 minutes 59.9 

seconds in 0.1-second increments, with accuracy held to +0.1% of the setting plus a 

maximum delay of 0.75 seconds. Normal operating temperature ranges between -40°C 

to 70°C (-40°F to 160°F). The primary components of the AC Microchron II Timer Relay 

are the same for all B relays, including both the 25 Hz and 60 Hz versions of this relay, 

see Figure 2–1. 

The timer module contains a microcontroller and Complementary Metal Oxide 

Semiconductor (CMOS) technology integrated circuits. The timer and relay structure are 

housed in a standard Alstom Type B2 relay enclosure. The unit plugs onto a B2 

plugboard. 

The vital relay structure of the unit has two series-connected coils. The contacts 

available for external use include one front-back 26-25-24 (silver impregnated-carbon to 

silver and silver to silver), three fronts 13-14, 15-16, 35-36 (silver impregnated-carbon to 

silver), and one back check circuit connected to contacts 11-12 (silver to silver). The 

remaining contacts are not available for external use due to the requirement for 

backward compatibility with AC Motor Timers and the common registration plate. The 

relay contacts are the same for both the 25 Hz and 60 Hz versions of the relay. Figure 

2–23 shows a front view of the relay contacts. 



Group Space- Front View 

6 

5 

4 

3 

2 

1 

1 2 3 

Make-before- 

Break Contact 

Contact read as (Column,Row) 

AC in 

(Start) 

Electrical 

Short 

4 5 6 

Safety 

Contacts 

Medium Duty 

Contacts 

Figure 2–23. Relay Contacts, Front View 

The unit contains two circuit boards, the Thumbwheel Switch Board and a Timer 

Processor Board. The Thumbwheel Switch Board contains a five-section thumbwheel 

switch to set the time and an AC to DC converter circuit. The Timer Processor Board 

contains a vitally programmed 8-bit microcontroller, low voltage shutdown and 

reset/watchdog Integrated Chip (IC), DC to DC converter, secondary reference clock 

and vital relay driver. Figure 2–24 is a schematic of relay component interaction. 

Relay Contact 

Block Assembly 

AC input 

55 

#18 WHITE 

56 

#18 BLACK 

BLACK 

OUT 

OUT 

Top Coil 

Bottom Coil 

Thumbwheel Switch Board 

IN - 

RED 

IN + RED 

3 

Timer Processor 

Board 

1 

1 

J2- 

J2- 

2 

2 

31166-299-01 

(110 Vrms/60 Hz) 

or 

31166-299-02 

(55 Vrms/25 Hz) 

Unregulated 

31166-300-01 

DC 

3 (110 Vrms/60 Hz) + #18 WHITE 

2 

or 

P2- 31166-353-01 P2- 

P2- 

P2-- #18 BLACK 

1 (55 Vrms/25 Hz) 4 

J2- 

J2- 

4 

Figure 2–24. AC Microchron II Timer Relay Schematic 



Table 2–3 summarizes the AC Microchron II Timer Relay operating characteristics. 

Table 2–3. AC Microchron II Timer Relay Operating Characteristics 

Relay 50800-103-01 50800-104-01 

Input Voltage 

Range 

Input Power While 

Timing 

88 to 135 Vrms, 60 Hz AC 44 to 66 Vrms, 25 Hz AC 

11 mA rms at 88 Vrms 






Input Power After 

Timing with Relay 

Energized 







The Timer Processor Board interfaces with the Thumbwheel Switch Board through a PC 

edge connector. The four-wire connector on the Thumbwheel Switch Board is used to 

provide AC power to the AC to DC converter (two wires), and route unregulated DC 

power to the Timer Processor Board (two wires). 

Vital software verifications continuously check the result of the microcontroller’s and 

supporting hardware’s functions. The microcontroller electronically energizes the relay 

coils after a set time delay interval has been reached. Any interruption of power to the 

relay causes the unit to reset and immediately return to the beginning of the timing 

interval. 

Indicators on the unit include a red LED that pulses during the timing cycle and 

becomes steady when the timing cycle is complete. A green LED illuminates at the 

completion of the timing cycle. 



2.4.4.3.1. Application Considerations 

The AC Microchron II Timer Relay has a common registration plate to the AC Motor 

Timer. The timer is designed to replace the AC Motor Timers listed in Table 2–4. The 

application of the AC Motor Timer used a check circuit wired between contacts 12 and 

53. This circuit consisted of two sets of contacts wired in series. The first set of relay 

contacts, 11 and 12, is a back check contact of the relay structure. The second set of 

contacts, 53 and 63 constitute a back check contact of the motor structure. 

Figure 2–25 shows a wiring diagram for the AC Motor Timer Plugboard with the two 

sets of contacts wired in series so that if one of them is open, the circuit opens. 

Verifying the closure of both sets of contacts verifies the timer has reset and a full timing 

cycle runs the next time power is supplied. 

NOTE 1: Thin lines represent internal wiring of Relay. 

Thick lines represent external Plugboard wiring. 

Control 

3E 

4E 

Test Terminal 

Check Circuit 

Plug Terminals 

TIME 

16 

15 

14 

13 

12 

11 

MBB 

26 

25 

24 

23 

22 

21 

36 

35 

34 

33 

32 

31 

46 

45 

44 

43 

M 

Motor 

56 

55 

54 

53 

+ 

Clutch 

- 

CHECK 

66 

65 

64 

63 

- 

+ 

Upper Coil 

(Slow Release) 

Lower Coil 

(Operating) 

+ 

- 

IN 

OUT 

IN 

OUT 

Plugboard Wiring 

Figure 2–25. AC Motor Timer Plugboard Wiring Diagram 



A jumper on the AC Microchron II Timer Relay has replaced the motor back check 

contact that existed between contacts 53 and 63 in the AC Motor Timer. The new AC 

Microchron II Timer Relay inherently provides full “set” time from the instant energy is 

applied; therefore, no “motor” back check contact is required for this function. 

2.4.4.3.2. Replaceable AC Motor Timers 

With proper installation, the AC Microchron II Timer Relay can replace certain AC Motor 

Timers. Table 2–4 shows the AC Motor Timers it can replace. 

WARNING 

THE AC MICROCHRON II TIMER RELAY MAY NOT BE 

INTERCHANGEABLE WITH A MOTOR-OPERATED TIMER IN EVERY 

CIRCUIT APPLICATION BECAUSE OF THE FOLLOWING DIFFERENCE 

BETWEEN THE TWO TIMERS: 

• AC MICROCHRON II TIMER RELAY - CHECK CIRCUIT OPENS 

AFTER TIME DELAY HAS EXPIRED, AND CLOSES WHEN POWER 

IS REMOVED 

• AC MOTOR TIMER - CHECK CIRCUIT OPENS AT BEGINNING OF 

TIME DELAY AND CLOSES WHEN POWER IS REMOVED 

Table 2–4. Replaceable AC Motor Timers 

AC Microchron II Timer Relay Part Number 

50800-103-01 (60 HZ operation) 

50800-104-01 (25 Hz operation) 

AC Motor Timer Part Number 

56007-050-01 

56007-051-01 

56007-060-01 

56007-061-01 

56007-066-01 

56007-067-01 

56007-067-02 

56007-068-01 

56007-068-02 

56007-062-01 

56007-063-01 

56007-065-01 

56007-069-01 

56007-070-01 



2.5. DC SPECIAL PURPOSE RELAYS 

2.5.1. Highway Crossing Signal Flasher Relay 

The electronically driven highway crossing flasher consists of a Type B1 neutral relay 

and a solid-state flasher module. The flasher module, attached to energy terminals on 

the back of the relays plugboard, establishes and maintains a flashing rate of 48 to 54 

flashes per minute (fpm) for highway crossing signals or 56 to 64 fpm for flashing 

wayside signal aspects. The drawing number of the flasher module determines the flash 

rate. Wiring is shown by Figure 2–26. 

(FRONT VIEW) 

16 

26 

36 

15 

25 

35 

14 

13 

12 

24 

23 

22 

34 

33 

32 



I ="IN" LEAD 


11 

21 

31 

I 

O 

3C 

3D 

R+ 

- 

+ 

1E 

3E 

(-) (+) 

Figure 2–26. Electronically-Driven Flasher Relay Wiring 

The flasher module drives the Type B1 neutral relay that has four dependent front-back, 

heavy-duty, lamp-control contacts. Full back contact pressure is maintained while the 

relay is not operating. 



2.5.2. Power-Transfer Relay 

A Type B power-transfer relay, built in Size 1 only, is essentially a DC neutral line relay 

operating on rectified alternating current. The rectifier (P/N 59899-005-03) is shown in 

Figure 2–27. 

B RELAY 1E POST 

RECTIFIER 

B RELAY 1E POST 

FRONT 

PLUGBOARD 

Figure 2–27. Type S1/4 Half-Wave Rectifier for Power-Transfer Relay 

While AC energy is on, the relay stays energized. If AC energy fails the relay armature 

drops and automatically transfers the circuits to local battery. The percent of release 

voltage, found by dividing the DROP AWAY voltage by the PICKUP voltage, is about 75 

percent at 70 degrees F. Power-transfer relay coil wiring is shown in Figure 2–28. 



(FRONT VIEW) 

1E 

16 26 36 

15 25 35 

14 24 34 

13 23 33 

12 22 32 

11 21 31 

I 

O 

I 

O 

3A 

3B 

3C 

3D 

3E 

6 

(-) 

5 

4 

3 

(+) 

2 

1 

(-) 

12-24 VAC 



I = "IN" LEAD 


Figure 2–28. Power-Transfer Relay Wiring 



2.5.3. Lamp-Control Relay 

Type B lamp-control relays, made in Size 1 only, regulate lamp circuits at highway 

grade crossings protected by flashing lights. The lamp-control contacts in space 1 

handle up to 15 amperes at 12 volts. The regular duty contacts in space 3 are for other 

circuits. 

When the relay is deenergized, the contact pusher in space 1 drops away from the 

lamp-control contact fingers. With this design, oscillations of the armature due to its 

striking the stop are not transmitted to the contacts when the relay is de-energized. The 

armature is completely disconnected from the contact fingers. 

Coil resistance is lower than the resistance of regular line relays to obtain fast pickup, 

opening the back contacts as rapidly as possible. Figure 2–29 shows standard wiring 

connections. 

(FRONT VIEW) 

36 

LAMP 

CONTROL 

CONTACTS 

15 

14 

13 

12 

35 

34 

33 

32 

REGULAR 

FRONT-BACK 

CONTACTS 

31 

I 

O 

I 

O 

3A 

3B 

3C 

3D 

(–) 

3E 

(+) 



I = "IN" LEAD 


Figure 2–29. Lamp-Control Relay Wiring 



2.5.4. Switch-Overload Relay 

The Type B1 switch-overload relay picks up on motor overload current through its lowresistance 

coil, and sticks up on control circuit energy through its high-resistance coil. 

See Figure 2–30 for an example of relay wiring. 

(FRONT VIEW) 

26 

25 

24 

23 

22 

21 

I 

O 

I 

O 

3A 

3B 

3C 

3D 

(–) 

(+) 

(+) 

(–) 

HOLD COIL 

PICK COIL 



I = "IN" LEAD 


Figure 2–30. Switch-Overload Relay Wiring 

Pickup of the relay releases the switch control relays, thus removing energy from the 

switch machine motor. When the polarity is reversed, the stick circuit opens and the 

overload relay releases, permitting reversal of the switch movement. 

Built-in thermal slow pickup characteristics prevent the relay from operating on normal 

starting surges of the switch motor. This feature also permits repeated switch operation 

that may dislodge the switch obstruction that is causing the overload. 

Switch-overload relays are available for low- or high-voltage switch machines. 



2.5.5. Code-Responsive Relay 

Type B code-responsive relays are built in Size 1 only. They are made with a light 

armature and contact structure so that they respond quickly to pulses of coded energy, 

even when the pulse frequency is as high as four pulses per second. 

Two types of structures are available. One structure has a maximum of two dependent 

front-back contacts and the other has a maximum of four dependent front-back 

contacts. The four-contact structure is usually supplied for heavy service, as the contact 

design provides more effective non-bounce characteristics. 

The relay armature is polarized by two permanent magnets so arranged as to allow the 

front contacts to close only if the proper polarity is applied. When the relay is deenergized, 

a bias spring, together with magnetic bias, returns the armature to the deenergized 

position to close the back contacts. Figures 2–31 and 2–32 show how the 

relay works. 

TRACK CIRCUIT DEENERGIZED 

+ – 

CODE TRANSMITTER 

SHUNTING RAILS 

N 

S 

Figure 2–31. Code-Responsive Relay De-energized 



TRACK CIRCUIT ENERGIZED 

+ – 


APPLYING BATTERY 

TO RAILS 

FRONT 

CONTACTS 

CLOSED 

N 

S 

Figure 2–32. Code-Responsive Relay Energized 

Figure 2–33 shows positive energy is connected to 3A and negative to 3C. All other B1 

relays have positive on 3C and negative on 3A. Each contact is connected internally to 

the terminal in the base for plug-in connection. Plugboard connections may be on 1 or 2 

terminals, depending on current values. 



(FRONT VIEW) 

16 

15 

14 

13 

26 

25 

24 

23 

12 

11 

22 

21 

I 

O 

I 

O 

3A 

3B 

3C 

3D 

(–) 

3E 

(+) 



I = "IN" LEAD 


Figure 2–33. Code-Responsive Relay Wiring 



2.5.6. Code Rate Transmitter Relay 

Type B code rate transmitter relays are built only in Size 2. This relay has an oscillating 

armature secured to a vertical shaft that is supported at both ends by bearings. Affixed 

to the upper part of the shaft is one cam. The cam opens and closes sets of contacts. 

Below the cam is an armature positioned between two pole pieces. Below the armature 

is a spiral spring. These parts form the rotor for the relay. 

COIL 

D-C VOLTAGE 

APPLIED HERE 

COIL CONTACT 

BACK CODING 

CONTACTS 

CLOSED ON 

POWER STROKE 

LOWER CAM 

POLE PIECES 

UPPER CAM 

SHAFT 

FRONT CODING 

CONTACTS 

CLOSED ON 

BACK STROKE 

WEIGHT DISC 

ARMATURE 

POSTION 

(POWER 

STROKE) 

ARMATURE POSITION 

(BACK STROKE) 

ARMATURE 

IN DEENERGIZED 

POSITION 

SPIRAL COIL 

SPRING 

POWER STROKE 

(COUNTERCLOCKWISE) 

BACKSTROKE 

(CLOCKWISE) 

Figure 2–34. Code Rate Transmitter Relay Operation 



The lower cam actuates contacts on either side of the cam to alternately open and close 

once for each rotor oscillation. Rate of armature oscillation depends on the mass of the 

armature and the length of the spiral spring. Relays with nominal rates of 50, 75, 120, 

180, 220 and 270 cycles per minute are available. 

CAUTION 

Code rate transmitter relays are shipped with a locked rotor. This lock 

must be released before the relay is placed in service. For more 

information, see "INSPECTION AND INSTALLATION," Section 3. 

Code rate transmitter relays have a single nominal 150-ohm resistance coil that 

operates in a 10-volt circuit. A nominal 1000-ohm resistance is shunted across the coil 

to absorb the inductive voltage surge, which occurs each time the contact opens the coil 

circuit. 

In addition, a 0.25 mfd capacitor and a 150-ohm resistor form an RC network that is 

shunted across the coil contact to suppress arcing and eliminate electro-magnetic 

interference. See Figure 2–35. 

FRONT OF RELAY 

( - ) 

16 26 36 46 56 66 

11 21 31 41 51 61 

- + 

1B 1H 2B 2H 

5H 5F 6H 6F 

6E 

( + ) 



Figure 2–35. Code Rate Transmitter Relay Wiring 



2.5.7. Code-Following, VTB Relay 

Type VTB code-following relays are used in coded track circuits and coded line circuits 

for signal control. It is used as a two position polar-biased relay. 

The relay occupies the plugboard space of a B2 relay and has one or two armatures, 

depending upon circuit application. The VTB relay plugboard, Figure 2–36, bolts on a B 

relay rack. Both plugboard and current test terminals are standard design. Optional 

voltage test terminals are designed for a clip-on meter lead. 

10 

9 

10 

9 

8 

7 

6 

5 

FEMALE 

REGISTRATION 

PLATE 

8 

7 

6 

5 

CONTACT 

TERMINALS 

4 

3 

4 

3 

2 

1 

2 

1 

6 

1 

6C 

6D 

6E 4E 3E 1E 

1C 

1D 

COIL 

TERMINALS 

TEST 

TERMINALS 

Figure 2–36. VTB Plugboard 

A simplified operating diagram of the polar-biased single armature relay is shown in 

Figure 2–37. The armature support spring is bent to provide a mechanical bias, thus, 

together with the permanent magnet, holding the armature against the left pole face 

when the relay is de-energized. 



FRAME 

MAGNET 

ARMATURE 

CORE 

Figure 2–37. Polar-Biased Single Armature Relay 

The following describes the two position polar-biased assembly. Both cores are 

connected by a yoke strap and bolted to the relay frame, forming a U-shaped structure. 

The armature is polarized by an alnico permanent magnet, which is mounted directly 

above the armature on the relay frame. The frame completes the magnetic circuit to the 

cores. 

The armature is supported at the center by two springs, which act as a trunnionless 

bearing. Vertical armature support springs are fastened at the bottom to the yoke. 

Horizontal guide springs are fastened at one end beyond either the right or left pole 

faces. In the double armature relay, each armature can be operated independently but 

not simultaneously. Contact actuation arms are riveted to the armature at the junction of 

the vertical and horizontal support springs. The vertical armature spring supports the 

armature and provides a torque bias to return the armature to the de-energized position. 

With energy applied to the coils in the direction indicated in Figure 2–38, the armature is 

attracted to the right pole piece, overcoming the bias of the armature support spring. 

Magnetic flux is now concentrated in the right core. When energy is removed from the 

relay, the armature, because of biasing, returns to the left pole piece, Figure 2–39. 



Figure 2–38. VTB Relay Energized 

A simplified operating diagram of a VTB polar-biased relay with two armatures is shown 

in Figure 2–39. 

COIL B 

CORE B 

COIL A 

CORE A 

Figure 2–39. VTB Relay, Two Armatures De-energized 

These armatures are biased in opposite directions, armature A against the left-handed 

pole piece, and armature B against the right-hand pole piece. This provides a 

symmetrical magnetic path. The permanent magnet flux divides equally between the 

two armatures and cores and reinforces the effect of the biasing springs on both 

armatures. 



If coil B is energized in the direction shown in Figures 2–40, the flux through core B 

increases greatly. 

N 

A 

B 

+ 

COIL B 

- 

CORE B 

S 

COIL A 

CORE A 

Figure 2–40. VTB Relay, Two Armatures Energized 

As a result, the spring bias and permanent magnet flux acting on armature B are 

overcome and the armature is attracted to the left-hand pole piece. If, instead, coil A is 

energized to produce the proper direction of magnetic flux, armature B remains in its 

biased position and armature A is attracted to the right pole piece. 



Figure 2–41 shows typical VTB relay wiring. 

110 

610 

6 FRONT BACK CONTACT 

SETS SHOWN. 

CONTACT ARRANGEMENT 

DEPENDS ON VTB RELAY 

ORDERED. 

CONTACTS IN ROW 1 

OPERATED BY NORMAL COIL, 

IN ROW 6 BY REVERSE COIL. 

12 

1C 

1D 

I 

O 

REVERSE 

I 

O 

NORMAL 

62 

6C 

6D 



I = "IN" LEAD 


(–) 

1E 

(+) (–) (+) 

3E 

4E 6E 

LINE RELAY 

INDEPENDENT COILS 

1C 

1D 

I 

O 

I 

O 

6C 

6D 

1C 

1D 

I 

– 

O 

I 

+ 

O 

6C 

6D 

(–) (+) 

4E 6E 

LINE RELAY 

SERIES COILS 

TRACK RELAY 

SERIES COILS 

Figure 2–41. VTB Relay Wiring 



2.6. AC TRACK RELAYS 

2.6.1. Vane Relay 

Type B2 vane relays are used in AC track circuits. They are high efficiency two position 

relays requiring low wattage in the track element for operation. 

A vane of an aluminum alloy is secured to a horizontal shaft, with a trunnion at each 

end, which is supported by jewel bearings. They accurately position the vane in the airgap 

between the two magnetic field structures with ample working clearance as shown 

in Figure 2–42. 

BOTTOM VIEW OF 

VANE AND COILS 

TOP VIEW OF 

VANE AND COILS 

COUNTER 

WEIGHT 

SHAFT 

TRUNNION 

Winding 

Core 

Winding 

VANE 

LOCAL COIL 

Winding 

TRACK COIL 

Winding 

LOCAL COIL 

VANE 

TRACK COIL 

Core 

Core 

RELAY BASE 

Figure 2–42. Vane Relay Structure 

The local and track windings are fastened to the base of the relay, thus providing 

conduction of heat from the coils and laminations to the outside air. Both the vane and 

magnetic structure are compact, yet are designed for correct distribution of mass and 

magnetic flux. See Figure 2–43 for an illustration of relay components with the relay 

energized. 

Pushers of insulated material transmit the movement of the vane shaft to the contacts. 

These contacts are similar to the ones used in DC relays, being flat springs molded in a 

phenolic block. 



VANE 

CONTACTS 

PUSHER 

(FOR CONTACTS) 

RELAY BASE 

LOCAL COIL 

WINDING 

STOP 

ROLLER 

SHAFT 

BEARING 

COUNTERWEIGHT 

Figure 2–43. Vane Relay Components 

The local coil may be double-wound so that the two windings can be hooked up in 

series or in parallel. When connected in parallel, each winding operates at half-voltage, 

and it becomes possible to connect a phase-shifting device, should track operating 

conditions make it necessary. Track windings are furnished the same way. 

Examples of phase shifting devices are: 

• track filter (P/N 58496-117-01) 

• local filter (P/N 58496-118-01) 

The local filter is a combined two-section series tuned and parallel tuned filter. The track 

filter contains a fuse, a capacitor, and a variable inductor. 

The local and track filters are used to prevent line induced noise and traction energy 

from interfering with track circuit performance. The filter acts as a partial phase shifter to 

help establish a 90 degree phase shift between the track and local windings of the track 

relay. This is especially important at minimum ballast conditions. 



Figure 2–44 shows the operation of the vane relay. An aluminum disc with a shaft 

through the center is supported so that it is free to rotate. If a permanent magnet is 

rotated about the disc shaft in such a way that the magnetic lines of force cut through 

and across the disc, the disc will start to rotate in the same direction as the permanent 

magnet, and at a slightly slower speed. 

MOVEMENT OF 

NON-MAGNETIC DISC 

N 

N 

S 

S 

MOVEMENT OF 

PERMANENT MAGNET 

Figure 2–44. Magnet Movement Drags the Metal Disc 

Figure 2–45 is an enlarged view of a section of the disc showing what occurs. When the 

permanent magnet is rotated, the magnetic lines of force cut the disc and produce a 

voltage between two points on the disc. A current, commonly known as an "eddy" 

current, flows between these points and back to its origin by the shortest path. These 

eddy currents produce small magnetic forces that react with the magnetic force of the 

permanent magnet, producing rotation. 



EDDY CURRENT INDUCED BY 

PERMANENT MAGNET IN 

NON-MAGNETIC DISC 

N 

DISC 

S 

Figure 2–45. Eddy Current Induction by Permanent Magnet 

In the vane relay, two electromagnets are constantly energized while the relay is picked 

up, but the magnetism produced by one of the electro-magnets lags in time with respect 

to the other. The reaction on the vane relay of the two independent magnetisms, which 

are out of phase, produces rotation, the same as that produced by the moving 

permanent magnet in Figure 2–45. 

Figure 2–46 shows a complete cycle of local track currents plotted with the track current 

lagging the local current. The alternating current produces a lateral movement of flux in 

the air gap, as shown. Reference lines A, B, C, D, etc., divide the complete alternating 

current cycle into eighths, and the small figures represent instantaneous pictures or 

"snapshots" of what occurs in the relay magnetic circuit. 



A 

C 

E 

G 

A' 

+ 

LOCAL 

- 

LOCAL 

- 

LOCAL 

+ 

LOCAL 

+ 

LOCAL 

- 

TRACK 

+ 

TRACK 

- 

B 

TRACK 

D 

- 

TRACK 

+ 

F 

TRACK 

H 

+ 

LOCAL 

- 

- 

LOCAL 

+ 

- 

LOCAL 

+ 

+ 

LOCAL 

- 

+ 

TRACK 

- 

+ 

TRACK 

- 

- 

TRACK 

+ 

- 

TRACK 

+ 

LOCAL 

CURRENT 

TRACK 

CURRENT 

TRACK CURRENT LAGS LOCAL CURRENT BY 90° 

A B C D E F G H A' 

Figure 2–46. Local and Track Current Cycles 

At A and A', the local current is at a positive maximum value and the track current is 

zero. The local winding is producing all the magnetic lines of force and their paths are 

shown by the dotted lines. 



In each snapshot, notice the solid arrow, which is accentuated merely for reference and 

not because the lines of force are concentrated in that particular path. Compare the 

position of this arrow in snapshots B, C, D, and E. See how the arrow moves across the 

whole length of the air gap, cutting through and across the vane, much the same as the 

magnetic lines of force of the permanent magnet in Figure 2–45. All the other arrows do 

the same. Here, then, is the counterpart of the moving permanent magnet, except that, 

in this case, the magnetic structures are stationary, and the alternating current produces 

the magnetic flux motion. 

For the relay to produce maximum torque with the minimum power input, the local and 

track current must be out of step by a quarter of a cycle or 90 degrees. Track relays, 

under adverse track conditions, may require a phase-shifting device inserted in the local 

phase to approximate the ideal current relationship. 

Figures 2–47 and 2–48 show the parallel and series hookup of local and track windings, 

while Figure 2–49 shows relay and plugboard wiring along with some vane relay 

supporting components. 

PARALLEL HOOKUP 

LO1– 

14 

T1– 

64 

LO2– 

13 

LO1+ 

12 

T2– 

63 

T1+ 

62 

LO2+ 

11 

61 

HEAVY LINES ARE 

PLUGBOARD WIRING 

T2+ 

T = TRACK WINDING 

LO = LOCAL WINDING 

Figure 2–47. Parallel Hookup of Windings 



SERIES HOOKUP 

LO1– 

14 

T1– 

64 

LO2– 

13 

LO1+ 

12 

T2– 

63 

T1+ 

62 

LO2+ 

11 

T2+ 

61 



T = TRACK WINDING 

LO = LOCAL WINDING 

Figure 2–48. Series Hookup of Windings 

NX55 

BX55 

14 

13 

12 

11 

2 FRONT 

2 BACK 

64 

63 

62 

61 

NX110 

BX110 

14 

13 

12 

11 

2 FRONT 

2 BACK 

64 

63 

62 

61 

LOCAL WINDING 

IN PARALLEL 

LOCAL WINDING 

IN SERIES 

1E 6E 1E 6E 

TAPPED RESISTOR 

BALANCE IMPEDANCE 

(P/N 42960-002-02) 

FIXED RESISTANCE 

RNX 

RBX 

TAPPED RESISTOR 

NON-ELECTRIFIED RAILROADS 



RNX 

ELECTRIFIED RAILROADS 

RBX 

Figure 2–49. AC Vane Relay 


Installation 

3. SECTION 3 – INSTALLATION 

3.1. GENERAL 

This section contains general installation procedures for Type B relays. Included is a 

procedure for inspecting each relay prior to installation, followed by the installation and 

adjustment procedure. 

3.2. RELAY INSTALLATION TOOLS AND SUPPLIES 

See Appendix C for a summary of B relay tools. See Section 7 for a listing of installation 

plugboards and supplies. 

3.3. INSPECTION 

Upon receipt of a shipment of Type B relays, inspect them for cleanliness and overall 

condition. Also, always verify the operating characteristics of the relay before installing it 

in a particular circuit. 

Prior to installing a Type B relay, follow the inspection procedure provided in Table 

3–1. Refer to section 2, Figure 2–1 for an illustration identifying the basic B relay 

components. 

Table 3–1. B Relay Pre-Installation Inspection Procedure 

Step 

Procedure 

1 Check that the relay cover and seal are not damaged. 

WARNING 

BREAKING THE RELAY COVER SEAL VOIDS THE WARRANTY 

ON THE RELAY. 

2 Verify that the relay prong surfaces are clean and not bent. 

While the prongs of the relay that engage with the terminals in the plugboard are 

clean and adjusted when they leave the factory, there is always the chance that 

they may become dirty or bent in handling. If prongs are dirty, clean by 

burnishing. 

3 When relay racks complete with plugboards are received, verify they are clean 

and not broken or cracked. The terminals should lie close to the insulators. The 

guide rods should be straight and at right angles to the plugboard. 


Installation 

3.4. INSTALLATION 

The B relay plugs into a plugboard assembly mounted on rack support bars. Plugboard 

assemblies: 

• are available in either B1 or B2 sizes 

• use insulators for separating the solder or crimp type terminals 

• hold the guide rods for alignment and securing the relay 

• hold the registration plates 

• can be provided with current or voltage test posts 

For a listing of plugboards, specialty parts, and mounting hardware refer to Section 

7.17., B Relay Plugboards and Terminal Boards. 

Most B relays are installed using the procedure provided in Table 3–2. 

Microchron II Timer Relay installation includes setting the timer. Follow the steps in 

Table 3–3 in the order provided to install a Microchron II Timer Relay (DC) or the steps 

in Table 3–5 to install an AC Microchron II Timer Relay. 

Built-in surge circuitry in the Microchron II Timer Relay provides adequate protection 

from transients on the power leads for circuits confined to a bungalow or train control 

relay room containing an installed Microchron II Timer Relay. If the energy circuit has 

contacts remote from the bungalow, follow the procedure in Table 3–4 to provide 

additional surge protection. 

NOTE 

To assure safe application of the AC Microchron II Timer Relay, all 

application circuits must be reviewed by Alstom engineering before it will 

be approved for use. 


Installation 

Table 3–2. B Relay Installation Procedure 

Step 

Procedure 

1 Verify the relay cover and seal are not damaged. 

2 Verify the surfaces of the relay prongs that engage with the terminals in the 

plugboards are clean and not bent. 

While the relay prongs are clean and adjusted when they leave the factory, they 

may become dirty or bent during storage and handling. 

• If prongs are dirty, clean by burnishing. 

• If prongs are bent, bend them back into position so the make contact when 

the relay is installed. 

3 Select the proper relay by checking the order reference number provided on the 

nameplate on the front of the relay. This number also appears on the detailed 

plans furnished with the installation and on the plugboard registration plate. 

REGISTRATION 

PLATE NUMBER 

NAME 

PLATE 

NAMETAG 

4 Slide the relay Nametag into slot. 

TEST DATA 

FORM 


Installation 

Table 3–2. B Relay Installation Procedure (Cont.) 

Step 

Procedure 

5 Code rate transmitter relays are shipped with the rotor locked to prevent 

damage to the relay. 

Before placing the relay into service the rotor must be unlocked by moving the 

arm on the back of the relay as shown below. 

ROTOR LOCKED FOR SHIPMENT 

Arm is located at back of transmitter. 

TO UNLOCK ROTOR FOR SERVICE 

Slide arm at back of transmitter to 

the position shown below 

Arm 

Arm 

Back of Transmitter 

Back of Transmitter 

A visual examination of the relay should also be performed to verify that with the 

arm in the unlocked position the rotor lock does not contact the rotor in any 

position of the rotor. 

After the relay is installed to its plugboard, the code rate of the relay should be 

verified to ensure it is correct. 


Installation 


Step 

Procedure 

6 Grasp the relay on the top and bottom of the cover; slide it onto the guide rods. 

If adjacent relay prohibits grasping of relay on top and bottom, use the handle 

on the front to push the relay along the guides. 

7 Press the relay firmly into place so that the back of the relay is snug against its 

plugboard. 

PLUGBOARD 

RELAY 

BASE 

CAUTION 

Do not exert excessive pressure on the relay. Pressure greater 

than finger pressure could damage the relay or plugboard. 


Installation 


Step 

Procedure 

8 Hold the relay in this position with one hand while putting on the knurled 

retaining nuts. The nuts should be tightened only until they just touch the end of 

the tube, but do not exert pressure against the relay. 

TUBE 

GUIDE ROD 

KNURLED 

NUTS 

KNURLED 

NUTS 

CAUTION 

DO NOT use the retaining nuts to pull the insulators and prongs 

into engagement. 

9 Screw on the lock nuts, holding the retaining nuts with the fingers to prevent their 

turning while tightening the lock nuts with an AAR wrench. 

LOCK NUTS 


Installation 

Table 3–3. Microchron II Timer Relay (DC) Installation Procedure 

Step 

Procedure 

1 Verify the relay cover and seal are not damaged. 

2 Verify the surfaces of the relay prongs that engage with the terminals in the 

plugboards are clean and not bent. 

While the relay prongs are clean and adjusted when they leave the factory, they 

may become dirty or bent during storage and handling. 


• If prongs are bent, bend them back into position so the make contact when 


3 Consider the operating characteristics of the Microchron II Timer Relay before 

installing any in a particular circuit. 

Select the proper relay by verifying relay characteristics: 

• Input Range is 8-31.5 VDC 

• Maximum Current Draw is 100 mA max at 15 Volts 

• Input Power required is regulated DC battery or an extremely well filtered 

rectified AC battery 

WARNING 

THE MICROCHRON II TIMER RELAY MAY NOT BE INTERCHANGEABLE 

WITH A MOTOR OPERATED TIMER IN EVERY CIRCUIT APPLICATION. 

DIFFERENCES IN OPERATION OF THE MOTOR TIMER BACK CONTACT 

REQUIRE CONSIDERATION OF THE CHECK CONTACT OPERATION IN 

THE SPECIFIC APPLICATION TO ENSURE THAT THE SAFETY 

PERFORMANCE OF THE CIRCUIT IS NOT COMPROMISED. BACK 

CONTACTS, OR CHECK CONTACTS, ON THE TYPE B2 AND KB MOTOR 

TIMERS OPEN AT THE BEGINNING OF THE TIMING CYCLE. BACK 

CONTACTS ON THE MICROCHRON II TIMER RELAY OPEN AT THE END 

OF THE TIMING CYCLE. 

WHILE IT IS DOUBTFUL THAT THERE IS A PROBLEM WITH THE MAJORITY 

OF CIRCUITS IN USE, AS AN ADDED SAFETY PRECAUTION TO PREVENT 

AN INADVERTENT SUBSTITUTION, THE MICROCHRON II TIMER RELAY 

HAS A REGISTRATION PLATE DIFFERENT FROM ANY OTHER TYPE B2 

MOTOR TIMER. 


Installation 

Table 3–3. Microchron II Timer Relay (DC) Installation Procedure (Cont.) 

Step 

Procedure 

4 CAUTION 

To prevent possible damage to the Microchron II Timer Relay, it is 

necessary to use a filter unit when the timer is to be operated from 

unfiltered full-wave, rectified AC, unless there are standby 

batteries. If the timer is powered with unfiltered, rectified AC 

voltage without a filter unit, it will not operate and could possibly 

damage the timer. 

If the power source is unfiltered AC, then follow Step 5 to install a filter unit on 

the relay. 

For filtered DC or filtered rectified AC, go to step 6. 

5 Install a filter board onto the relay plugboard as shown: 

(+) 

6E 

3E 

52 51 

TE 

R1 

A 

CR1 

+ 

C1 

TYPICAL CIRCUIT 

4E 

(–) 

66 

56 

46 

65 

55 

45 

64 

54 

44 

63 

53 

43 

62 

52 

42 

FILTER BOARD 58496-116-01 

includes 3E-4E mounting 

hardware and 3 connectors 

61 

51 

41 

CR1 A TO 52 

6D 

6C 

C1 

R1 

1C 

1D 

TO 51 

4E 

3E 

TO 6E 

SOLDERTAB 

SIDE VIEW 

REAR VIEW 

6E 

4E 

3E 

1E 

NOTE: 

PLUGBOARD KITS 

P/N 59686-007-14 FOR CRIMP TERMINALS 

P/N 59686-007-12 FOR SOLDER TERMINALS 


Installation 


Step 

Procedure 

6 For a new installation, install the plugboard in the Type B relay rack, connect the 

power as shown, and wire the contacts as required by the external circuits. 

(FRONT VIEW) 

46 56 66 

(FRONT VIEW) 

46 56 66 

64 

63 

43 53 

42 

52 

51 

61 

(–) 

A 

FILTER 

64 

63 

43 53 

42 

52 

51 

61 

TIMER 

ASSEMBLY 

TIMER 

ASSEMBLY 

I 

O 

I 

O 

I 

O 

I 

O 

6E 

(+) 

(–) 

3E 

4E 

6E 

(+) 

WIRING OF MICROCHRON TIMER FOR DC OPERATION 

WIRING OF MICROCHRON TIMER FOR OPERATION ON 

UNFILTERED FULL-WAVE RECTIFIED AC 

THICK WIRING IS PLUGBOARD WIRING . 

THIN WIRING IS WIRING WITHIN THE RELAY. 

I = "IN" LEAD 


7 Attach the mating registration plate (packed with the Microchron II Timer Relay) 

to the plugboard and plug in the timer. 


Installation 


Step 

Procedure 

8 For a timer with a tamper evident color seal, remove the plastic seal. For a timer 

with a lead seal, remove seal, thumbnuts, and cover to expose the thumbwheel 

switches. 

GREEN LED 

RED LED 

THUMBWHEEL 

SWITCHES 

1 0 2 0 

TAMPER EVIDENT COLOR SEAL 

(P/N 37947-059-00, RED TINT) 

(P/N 37947-058-00, GREEN TINT) 

9 Adjust the thumbwheel switches to the desired timing interval. 

NOTE 

Certain switches contain “stops” and only rotate between 

allowable settings. For example, the “Tens of Minutes” switch can 

only rotate between the “0” and “1” positions and the “Tens of 

Seconds” switch can only rotate between the “0” and “5” positions. 


Installation 


Step 

Procedure 

10 When setting the time, use the standard representation. 

Tens 

Minutes 

Unit 

Minutes 

Tens 

Seconds 

Unit 

Seconds 

1 9 5 9 

This example shows a setting of 19 minutes and 59 seconds. A time set at 89 

seconds would read 01:29. 

11 Energize the timer and verify the elapsed time with an external timing device 

from the instant energy is applied until the relay front contacts close. 

The operational relay timing must be within ±0.1% of the time pre-selected by 

the thumbwheel switches plus a maximum delay of 0.75 seconds. 

If the timing is not within acceptable limits, remove and replace the relay. 

Then perform the mechanical and electrical tests provided in Section 6, 

Corrective Maintenance, on the malfunctioning relay. 

12 For timers with a tamper evident color seal (see figure in Step 8), replace the 

plastic seal. For relays with a tamper evident lead seal (P/N 35285-000-00), 

replace switch cover, thumbnuts, seal, and crimp seal. 

13 Verify the time setting. 


Installation 

Table 3–4. Microchron II Timer Relay (DC) Surge Protection Installation Procedure 

Step 

Procedure 

1 Install an equalizer (Alstom P/N 56937-021-00) across the power leads ahead of 

where the leads will be wired to the Microchron II Timer Relay. 

REMOTE 

CONTACTS 

LOCAL 

CONTACTS 

6E 52 51 TE 

REMOTE 

SIGNAL BATTERY 

MICROCHRON II 

TIMER 

EQUALIZER 

PART NO. 56937-021-00 AND 

TERMINAL BLOCK 46048-022-08 

Electrical parameters of this equalizer are 1000 ohms minimum at 1.5 volts DC 

and breakdown range of 75 to 150 volts DC, not to exceed 150 volts DC. 


Installation 

Table 3–5. AC Microchron II Timer Relay Installation Procedure 

Step 

Procedure 

1 Check that the relay cover and seal are not damaged. 

2 Verify that the relay prong surfaces are clean and not bent. 

While the prongs of the relay that engage with the terminals in the plugboards 

are clean and adjusted when they leave the factory, there is always the chance 

that they may become dirty or bent in handling. 


• If prongs are bent, bend them back into position so they make contact when 


3 Review the operating characteristics of the relay and verify the appropriate relay 

is being installed before proceeding. 

Relay 50800-103-01 50800-104-01 

Input Voltage Range 

Input Power While Timing 

Input Power After Timing 

with Relay Energized 

88 to 135 Vrms, 60 Hz 

AC 







WARNING 

44 to 66 Vrms, 25 Hz AC 







THE AC MICROCHRON II TIMER RELAY MAY NOT BE 

INTERCHANGEABLE WITH A MOTOR-OPERATED TIMER IN 

EVERY CIRCUIT APPLICATION BECAUSE OF THE 

FOLLOWING DIFFERENCE BETWEEN THE TWO TIMERS: 

• AC MICROCHRON II TIMER RELAY - CHECK CIRCUIT 

OPENS AFTER TIME DELAY HAS EXPIRED, AND CLOSES 

WHEN POWER IS REMOVED 

• AC MOTOR TIMER - CHECK CIRCUIT OPENS AT 

BEGINNING OF TIME DELAY AND CLOSES WHEN POWER 

IS REMOVED 

4 For a new installation, check plugboard to ensure proper connections; refer to 

ED50800-103-01 for the 60 Hz relay or ED50800-104-01 for the 25 Hz relay. 


Installation 

Table 3–5. AC Microchron II Timer Relay Installation Procedure (Cont.) 

Step 

Procedure 

5 Attach the mating registration plate (packed with the AC Microchron II Timer 

Relay) to the plugboard and plug in the relay. 

6 Detach the cover that seals access to the thumbwheel switches by removing the 

tamper evident lead seal, two thumbnuts, and sliding the clear plastic cover off 

the studs. 

COVER 

1 2 3 4 

5 

THUMBWHEEL SWITCHES 

7 Adjust the thumbwheel switches to the desired timing interval. 

NOTE 

Certain switches contain “stops” and only rotate between 

allowable settings. For example, the “Tens of Minutes” switch can 

only rotate between the “0” and “1” positions and the “Tens of 

Seconds” switch can only rotate between the “0” and “5” positions. 


Installation 

Table 3–5. AC Microchron II Timer Relay Installation Procedure (Cont.) 

Step 

Procedure 

8 When setting the time, use the standard representation. 

Tens 

Minutes 

Unit 

Minutes 

Tens 

Seconds 

Unit 

Seconds 

Tenth of 

Seconds 

1 9 5 9 9 

This example shows a setting of 19 minutes and 59.9 seconds. A time set at 

89.9 seconds would read 01:29.9. 

9 Energize the timer and verify the elapsed time with an external timing device 

from the instant energy is applied until the relay front contacts close. 

A red LED illuminates when power is first applied; it blinks until the delay set on 

the switches has expired. 

Then, a green LED illuminates to indicate that the delay has expired. 

The operational relay timing must be within ±0.1% of the time pre-selected by 

the thumbwheel switches plus a maximum delay of 0.75 seconds. 

If the timing is not within acceptable limits, remove and replace the relay. 

Then perform the mechanical and electrical tests provided in Section 6, 

Corrective Maintenance, on the malfunctioning relay. 

10 Reseal access to the thumbwheel switches by sliding the clear plastic cover 

over the two studs and securing it in place with the two thumbnuts. Install a new 

tamper evident lead seal (P/N 35285-000-00), using the holes in the studs, and 

crimp securely. 

11 Verify the time setting. 


Installation 



Preventive Maintenance 

4. SECTION 4 – PREVENTIVE MAINTENANCE 

4.1. GENERAL 

This section includes the preventive maintenance procedures associated with proper 

Type B relay operation. These procedures are provided as a minimum requirement, and 

may need to be modified due to local operational conditions or requirements. 

Tests and inspections must include the following: measurement of PICKUP current and 

DROPAWAY current, timing of slow operating and timing relays, and visual inspection 

of contacts for damage or misalignment, corrosion or other contamination of parts, loose 

parts inside cover, broken seal, cracked, broken or discolored covers and wear particles 

on inside of cover. 

WARNING 

NOTIFY AND OBTAIN PERMISSION FROM CENTRAL CONTROL 

PRIOR TO PERFORMING ANY ELECTRICAL TESTS ON RELAYS. 

DURING THE ELECTRICAL TESTS RELAYS ARE INTENTIONALLY, 

MANUALLY ACTIVATED. THIS ACTIVATION AFFECTS THE RELAY 

CIRCUIT(S) AND POSES A POTENTIAL THREAT TO RAIL SAFETY. IT 

MAY PROVIDE FALSE INFORMATION, INTERRUPT OPERATION, AND 

CAUSE ALARMS TO INADVERTENTLY SOUND AND/OR BE 

DISPLAYED. TAKE ALL STEPS NECESSARY TO ENSURE THE SAFE 

PASSAGE OF TRAFFIC IS MAINTAINED. 

NOTIFY CENTRAL CONTROL WHEN TESTING IS COMPLETE AND 

THE RELAY IS BACK IN OPERATION. 

B relays identified as not passing inspection or meeting defined tolerances during the 

relay electrical test must be removed from service. To return a relay to service, the 

mechanical tests and adjustments provided in Section 6, Corrective Maintenance must 

be performed, followed by electrical tests to verify relay performance. 

The following test and adjustment procedures require qualified maintenance personnel 

to test the relay portion of Type B relays. 

Specifications for testing and inspecting all Alstom relays are given on relay Engineering 

Data (ED) sheets. Relay drawing and catalog numbers can be used with Appendix A to 

look up the Engineering Data (ED) Sheet number. To determine a relay's drawing or 

catalog number, refer to Heading 1.2.2., Identification. For copies of ED sheets, consult 

your Alstom Sales Representative or Alstom Customer Service. 

Troubleshooting procedures are provided in Section 5, Troubleshooting. Mechanical 

tests and relay replacement procedures are provided in Section 6, Corrective 

Maintenance. 



4.2. PREVENTIVE MAINTENANCE INTERVALS 

Preventive maintenance procedures are performed on B relays with the covers on and 

sealed. The tests are a good check on the overall performance of the relay, and are 

completed easily and quickly. 

Preventive maintenance consists of three procedures: 

• Visual Inspection 

• Electrical Test 

• Timing Test, where applicable 

Table 4–1 shows the recommended preventive maintenance time intervals. 

Table 4–1. Preventive Maintenance Intervals 

Relay Type 

Preventive Maintenance Interval 

Carborne Relays 

Every 6 years 

Vital Wayside Relays 

Every 4 years 

DC Polar and Vane Relays 

Every 2 years 

Master (or Primary) Relays, spring tension* 

Every 2 years 

Microchron II Timer Relays 

Every year 

* Any master or primary relay of the torque type, that depends on spring tension to return contacts to the 

de-energized position in noncoded continuous inductive automatic train stop or train control systems. 

Vital wayside, DC Polar and Vane Relays can be inspected and tested while installed in 

racks or they may be removed from service and plugged on a shop test board for 

preventive maintenance. Electrical tests of relays in the relay racks are limited to 

measuring operating values and comparing the values to the specifications provided in 

the Engineering Data (ED) sheets. Relay drawing and catalog numbers can be used 

with Appendix A to look up the Engineering Data (ED) Sheet number. To determine a 

relay's drawing or catalog number, refer to Heading 1.2.2., Identification. 

Carborne and Master Relays must be removed from service for inspection and testing. 

Relay removal and installation procedures are provided in Section 6, Corrective 

maintenance. 

NOTE 

Relays not passing any of the preventive maintenance tests or inspections 

must be replaced and not returned to service until the operating 

characteristics and conditions are in accordance with Alstom Engineering 

Data (ED) sheet specifications. 



4.3. PREVENTIVE MAINTENANCE TOOLS 

See Appendix C for a summary of B relay tools. 

A specific wrench is used to turn the terminal nut on the current test post to open the 

coil circuit. Figure 4–1 shows a Spanner Nut Wrench (also called the "E" post wrench, 

P/N 55393-003-01). 

Figure 4–1. Spanner Nut Wrench 

The Shop Test Rack, P/N 56573-002-01, is used to test relays in the shop. See 

Appendix C for details about the Shop Test Rack. 

Electrical tests for operating values on Type B2 two element vane relays are made with 

the Vane Relay Test Unit, P/N 20182-111-01. See Appendix C for details about this test 

unit. 

4.4. RELAY INSPECTION 

All Type B relays must be visually inspected prior to performing electrical tests. Each 

Type B relay is in a clear plastic case and the parts to be inspected can be seen with 

the cover installed and sealed. 

WARNING 

BREAKING THE RELAY COVER SEAL VOIDS THE WARRANTY ON 

THE RELAY. 

Visual inspection includes checking contacts for damage or misalignment, corrosion or 

other contamination of parts, loose parts inside cover, broken seal, cracked, broken or 

discolored covers and wear particles on inside of cover. The inspection procedure 

provided in Table 4–2 describes how to inspect a typical B1 relay. Table 4–3 describes 

how to inspect a vane relay. Table 4–4 is a general relay inspection procedure 

applicable to all other relays. 

NOTE 

If any damage is detected, the relay must be removed from service and 

replaced. 



Table 4–2. Typical B1 Relay Visual Inspection Procedure 

Step 

Procedure 

1 Check that the relay cover and seal are not cracked, broken or discolored. 

2 Verify that relay components are not loose inside the cover. 


COVER 




PUSHER 

BACK CONTACT 

HEEL CONTACT 

FRONT CONTACT 


BASE 

CONTACT GROUP 


STOP PLATES 

PUSHER JAW 



ARMATURE 

ARMATURE 

RETAINING 

PLATE 

ADJ. NUT 

LOCK NUT 

YOKE 

NUT 

ARMATURE 

BEARING 

PLATE 

NAME 

PLATE 

SAFETY 

PIN 

COIL 


PLATES PRONGS 


3 Verify the contacting surfaces are clean, smooth, and not bent or mis-aligned. 

CORE 



Table 4–2. Typical B1 Relay Visual Inspection Procedure (Cont.) 

Step 

Procedure 

4 Verify that normally open co-acting contacts meet squarely and simultaneously 

when relay is energized. Contacts should have wipe as armature goes through 

to its front stop. 

When relay is deenergized, normally closed contacts should meet squarely and 

simultaneously. Contacts should have wipe as armature goes to its backstop. 

During pick up and drop away, armature must move freely on its bearing plate. 

5 If components inside the cover are loose, mis-aligned, or required cleaning, 

remove and replace the relay. 

6 If a relay is removed for any reason during the inspection procedure, the 

mechanical tests in Section 6 may be performed as specified. The relay may not 

be returned to service until the operating characteristics and conditions are in 

accordance with Alstom ED sheet specifications. 



Table 4–3. Vane Relay Visual Inspection Procedure 

Step 

Procedure 



PUSHER 

BACK CONTACT 

HEEL CONTACT 

FRONT CONTACT 


BASE 

CONTACT GROUP 


STOP PLATES 

SHOCK INDICATOR 

SHAFT BEARING 

COUNTER WEIGHT 

VANE 

LOCAL COIL WINDING 

3 Verify the contacting surfaces are clean, smooth, and not bent or mis-aligned. 

Relay vane must not contact either local or track lamina in any position of the 

vane. 


when relay is energized. Contacts should have wipe as vane goes through to its 

front stop. 


simultaneously. Contacts should have wipe as vane meets its backstop. 

During pick up and drop away, vane must move freely in its jewel bearings. 

There should be no indication of friction or binding in the bearings. 

If any friction or binding is observed the relay must be removed and replaced. 



Table 4–3. Vane Relay Visual Inspection Procedure (Cont.) 

Step 

Procedure 







Table 4–4. Microchron II Timer Relay Visual Inspection Procedure 

Step 

Procedure 

1 Check that the relay cover and seal are not cracked, broken or discolored. If 

any damage is detected, the relay must be removed from service and replaced. 


3 See that the contacting surfaces are clean, not bent or mis-aligned. 

4 If prongs are dirty, clean by burnishing, 

5 If components inside the cover are loose, mis-aligned, or require cleaning, 


If a relay is removed for any reason during the inspection procedure, the 

corrective maintenance in Section 6 must be performed as specified. 



Table 4–5. Miscellaneous Relay Visual Inspection Procedure 

Step 

Procedure 



Many components are common to all B1 and B2 relays, reference Section 7 for 

drawings of specific relay components. 

3 Verify any contacting surfaces are clean, smooth, and not bent or mis-aligned. 

4 For relays with flexible connectors, the connectors must be intact and must not 

touch any adjacent parts. 

Any coils must be secured in place and in good condition. 


when relay is energized. Contacts should have wipe as armature goes through 

to its front stop. 


simultaneously. Contacts should have wipe as armature goes to its backstop. 

During pick up and drop away, armature must move freely on its bearing plate. 









4.5. ELECTRICAL TESTS 

Electrical tests are made to verify the operating current values and to check contact 

resistances of the relay. If the relay does not operate at the proper values, readjust the 

relay to the readjustment values specified on the relay ED sheets. Relay drawing and 

catalog numbers can be used with Appendix A to look up the Engineering Data (ED) 

Sheet number. To determine a relay's drawing or catalog number, refer to Heading 

1.2.2., Identification. 

See Table 4–6 for a summary of relay specific electrical test procedures included in this 

manual. 

WARNING 

NOTIFY AND OBTAIN PERMISSION FROM CENTRAL CONTROL 

PRIOR TO PERFORMING ANY ELECTRICAL TESTS ON RELAYS. 

DURING THE ELECTRICAL TESTS RELAYS ARE INTENTIONALLY, 

MANUALLY ACTIVATED. THIS ACTIVATION AFFECTS THE RELAY 

CIRCUIT(S) AND POSES A POTENTIAL THREAT TO RAIL SAFETY. IT 

MAY PROVIDE FALSE INFORMATION, INTERRUPT OPERATION, AND 

CAUSE ALARMS TO INADVERTENTLY SOUND AND/OR BE 

DISPLAYED. TAKE ALL STEPS NECESSARY TO ENSURE THE SAFE 

PASSAGE OF TRAFFIC IS MAINTAINED. 

NOTIFY CENTRAL CONTROL WHEN TESTING IS COMPLETE AND 

THE RELAY IS BACK IN OPERATION. 

To power most B1relays, apply a variable current source to the coil leads, refer to the 

specific relay wiring diagram in Section 2. To power an AC vane relay, see Table 4–8. 



Table 4–6. Electrical Test Procedures 

Electrical Test Procedure 

Table 

AC Light-Out Relay Test Procedure 4–7 

AC Vane Relay Test Procedure 4–8 

Biased-Neutral Relay Test Procedure 4–9 

Code-Responsive Relay Test Procedure 4–10 

Code Rate Transmitter Relay Test Procedure 4–11 

Magnetic-Stick Relay Test Procedure 4–12 

Microchron II Timer Relay Test Procedure 4–13 

Neutral Relay Test Procedure 4–14 

Polarized Relay Test Procedure 4–15 

Power-Transfer Relay Test Procedure 4–16 

Switch-Overload Relay Test Procedure 4–17 



4.5.1. AC Light-Out Relay Test 

The AC Light-Out Relay is available in two coil configurations: 

• A pair of low resistance coils wired in series 

• A low resistance coil and high resistance coil 

To obtain DROPAWAY, PICKUP, and WORKING current values follow the procedure in 

Table 4–7. 

Table 4–7. AC Light-Out Relay Test Procedure 

Step 

Procedure 

1 Perform the visual inspection procedure in Table 4–2. 

2 Saturate the relay coils with current at the value shown on the Relays ED sheet. 

Coils are connected in series unless otherwise indicated. 

3 Slowly decrease current and obtain DROPAWAY, which is the value at which 

the back contacts just make. 

4 Open circuit. 

5 Close circuit and slowly increase the current to obtain PICKUP, which is the 

value at which the front contacts just make. 

6 Continue to slowly increase the current to obtain WORKING current, which is 

the value at which the armature is against the front stop. Frequently the PICKUP 

and WORKING current values are the same. 



4.5.2. AC Vane Relay Test 

To test a two-element vane relay follow the procedure provided in Table 4–8. To 

operate the text fixture see Appendix C. 

Table 4–8. AC Vane Relay Test Procedure 

Step 

Procedure 


2 Connect the relay, meters and transformer, if required, to the Vane Relay Test 

Unit. 

LINE 

EARTH 

NEUTRAL 

POWER 

12 11 

SW1 

FUSE 

2A 

TP1 

SW2 

12 

11 

LINE/TRACK 

POWER 

Rs 

FINE 

100 OHMS 

AC SUPPLY LINE 

SW-1 

POWER 

ON 

LINE/TRACK 

POWER 

Rp 

COURSE 

250 OHMS 

R1 

50 OHMS 

22 

21 SHUNT 

12 11 

SW3 

SHUNT 

11 12 

SW4 

CURRENT 

VOLTS 

COIL 

2 ELEMENT VANE RELAY 

COIL 

VOLTS 

CURRENT 

– + + – – + + – – + + - 

AMMETER 

0-250 mA 

VOLTMETER 

0-150 VOLTS 

11 

14 

12 

13 

LOCAL 

R 

TRACK 

61 

64 

62 

63 

VOLTMETER 

0-150 VOLTS 

AMMETER 

0-2 AMPS 

LOCAL 

TRACK 

3 Carefully adjust supply voltage (a tapped transformer is one means) so that the 

local element of the relay has the rated voltage imposed. 

Stabilize relay for at least one hour before taking electrical values with nominal 

voltage on the local element. 

Make allowance for the voltage drop across the milliammeter. Obtain local 

element readings. 

4 Shunt the local milliammeter and adjust the local element voltage so that the 

rated voltage is impressed. Hold this value constant during test. 

5 No voltmeter is required for the track element, as DROPAWAY, DROPAWAY to 

stop, PICKUP, and WORKING are expressed in current values. 

6 While holding the voltage on the local element constant at its rated value and 

with the relay in its normal position, vary the track element current by moving 

the slider on the potentiometer or adjustable resistor. Determine the 

DROPAWAY, DROPAWAY to stop, PICKUP, and WORKING current values for 

the track element. 



4.5.3. Biased-Neutral Relay Test 

Use the procedure in Table 4–9 to verify biased-neutral relay performance. 

Table 4–9. Biased-Neutral Relay Test Procedure 

Step 

Procedure 

1 Perform the B1 relay visual inspection procedure in Table 4–2. 











7 All biased-neutral relays are designed to ensure that they will not pick up when 

50 times normal WORKING voltage is applied in the reverse direction. 

Apply 50 times the normal WORKING voltage in the reverse direction. Relay 

should not pick up. 

If the relay picks up, remove it from service. 



4.5.4. Code-Responsive Relay Test 

To obtain operating values for the code-responsive relay follow the procedure in 

Table 4–10. 

Table 4–10. Code-Responsive Relay Test Procedure 

Step 

Procedure 


2 Saturate relay coils at current value specified on specific ED sheet. 

3 Operate relay several times by opening and closing circuit. 

4 Slowly reduce current to obtain DROPAWAY value. Two readings of 

DROPAWAY values should be taken, one to close back contacts and the other 

to allow the armature to touch its backstop pin. 

5 Open the circuit, close the circuit, and then slowly increase the current to obtain 

PICKUP and WORKING values. PICKUP is the current value at which the front 

contacts just close. WORKING is the current value at which the armature in the 

fully energized position is up against the stop. 



4.5.5. Code Rate Transmitter Relay Test 

To verify the code rate transmission in Cycles Per Minute (CPM), also referred to as the 

timing test, follow the procedure in Table 4–11. 

Table 4–11. Code Rate Transmitter Relay Test Procedure 

Step 

Procedure 


2 Apply power to the relay: connect the electric counter through one set of 

contacts, operating the code rate transmitter relay at rated voltage (refer to the 

relay ED sheet). 

IN 

10V 

DC 

+ 

CONTACT ON 


– 

PR1 

ELECTRIC COUNTER 

3 Connect a timer or oscilloscope to the time contacts. Verify that the time 

contacts remain closed at least 25.5 seconds during a one-minute run (42.5% 

min.). 

3 Determine the number of times the circuit is closed during one minute, this value 

is the code rate. 

4 With voltage at normal voltage, 10 percent below and 20 percent over normal 

rated voltage, and at 75% of rated voltage the code rate in Cycles Per Minute 

(CPM) must be held within the following limits unless the associated ED sheet 

indicates otherwise. 

Nominal Code 

Rate 

At Normal Volts At 10% Under or 20% 

over Normal Volts 

At 75% of Rated 

Volts 

50 ±1 ±2 ±5 

75 ±2 ±3 ±5 

120 ±2 ±3 ±5 

180 ±2 ±3 ±5 

220 ±2 ±3 ±5 

270 ±2 ±3 ±5 

6 To check starting voltage, gradually increase the voltage across the coil 

terminals and note the voltage when the rotor begins oscillation. This voltage 

should be within the ED sheet limit. 



4.5.6. Magnetic-Stick Relay Test 

To verify the performance of the magnetic-stick relay, follow the procedure in 

Table 4–12. 

Table 4–12. Magnetic-Stick Relay Test Procedure 

Step 

Procedure 


2 Stabilize relay by operating 5 to 10 times, alternately from NORMAL to 

REVERSE, at the saturation value specified on relays specific ED sheet. 

3 Saturate Reverse at value specified on ED sheet. 

4 Gradually reduce current to zero. 

5 Reverse polarity and gradually increase current to point where armature moves 

to normal contacts. Without further increase in current, armature must proceed 

through to full normal position against stop. This is the NORMAL PICKUP and 

WORKING current and must be within the limits specified on ED sheet. 

6 Saturate normal at value specified on ED sheet. 



to Reverse contacts. Without further increase in current, armature must proceed 

through to full reverse position against stop. This is the REVERSE PICKUP and 

WORKING current and must be within the limits specified on the ED sheet. 



4.5.7. Microchron II Timer Relay Test 

Follow the procedure in Table 4–13 to perform the electrical test on either the AC 

Microchron II Timer Relay or the Microchron II Timer (DC) Relay. 

Table 4–13. Microchron II Timer Relay Test Procedure 

Step 

Procedure 


2 Remove the timer electronics by following the procedure provided in 

Table 6–12. 

3 To power the relay, apply a variable current source to the coil leads (one coming 

from each relay coil), utilizing a meter tip plug to interface the current source 

with the female cap connectors on the coil leads. 

4 Apply saturation current as listed on the ED sheet for the relay. 

5 Slowly decrease current to relay to find the DROPAWAY value. This is visually 

determined by seeing the back contacts just make. Record this current value. 

6 Remove relay power. 

7 Reapply relay power and increase the output from the current source until the 

relay just makes its front contacts. Read the PICKUP value. Record this current 

value, this is the WORKING current. 

NOTE 

At this current value, the stop screw (residual screw) in the 

armature should continue to move until it hits the core surface. 

8 Compare measured values of the two currents with the ED sheet readjustment 

value. If these values are within the limits of the ED sheet, the relay is properly 

adjusted. If not, recheck adjustments against the foregoing instructions and 

retest the relay as per Steps 3 through 7. 

9 After the relay is checked and/or readjusted, reassemble the timer electronics 

by following the procedure provided in Table 6–13. 



4.5.8. Neutral Relay Test 

To obtain DROPAWAY, PICKUP, and WORKING current values follow the procedure 

provided in Table 4–14. 

Table 4–14. Neutral Relay Test Procedure 

Step 

Procedure 














4.5.9. Polarized Relay Test 

To obtain the operating values of polarized relays follow the procedure provided in 

Table 4–15. 

Table 4–15. Polarized Relay Test Procedure 

Step 

Procedure 


2 Stabilize relay by operating 5 to 10 times, alternately from Normal to Reverse, at 

the saturation value specified on relays specific ED sheet. 

3 Saturate Reverse at value specified on ED sheet. 



to normal contacts. Without further increase in current, armature must proceed 

through to full normal position against stop. This is the NORMAL PICKUP and 

WORKING current and must be within the limits specified on ED sheet. 

6 Saturate Normal at value specified on ED sheet. 



to reverse contacts. Without further increase in current, armature must proceed 

through to full reverse position against stop. This is the REVERSE PICKUP and 

WORKING current and must be within the limits specified on the ED sheet. 



4.5.10. Power-Transfer Relay Test 

Follow the procedure in Table 4–16 to test a Power-Transfer Relay. See specific ED 

sheet for exact details. 

Table 4–16. Power-Transfer Relay Test Procedure 

Step 

Procedure 


2 Apply power to the relay. 

3 Use this circuit for testing power-transfer relays: 

110 V 

60 Hz 

12 V 

MAX. 

0-15 V 

AC 

V 

RELAY UNDER TEST 

3B 

3A 

3C 

3D 

RECTIFIER 

Drawing No. 59899-005-03 

4 See specific ED sheet for specifications. 



4.5.11. Switch-Overload Relay Test 

The switch-overload relay requires special adjustment. See specific ED sheet for exact 

details and operating values. 

Table 4–17. Switch-Overload Relay Test Procedure 

Step 

Procedure 


2 See specific ED sheet for specifications. 

3 Apply the minimum specified operating current to the terminals of the pick up 

winding (low resistance) with positive energy on 3C and negative energy on 3D. 

After 1½ minutes back off overpressure spring until relay picks. Lock spring at 

this setting. 

4 Allow relay to cool at least 10 minutes. 

5 Apply the minimum specified operating current to the terminals of the pick up 

winding for 1½ minutes. Relay must not pick. After 1½ minutes, quickly increase 

current to maximum pick up current. Relay must pick up. Remove power. 

6 Check high resistance winding to insure the PICKUP and WORKING current 

value is within specified limits. 



4.6. TIMING TESTS 

4.6.1. Code Rate Transmitter Relay Timing Test 

The Code rate Transmitter Relay Timing Test is performed to check that the code rate 

transmitter relay contacts remain closed for the proper length of time. This test is 

included in Table 4–11, Code Rate Transmitter Relay Test Procedure. 

4.6.2. Microchron II Timer Relay (DC) Timing Test 

The Microchron II Timer Relay (DC) Timing Test is performed during the Microchron II 

Timer Relay (DC) installation procedure in Table 3–3. 

To verify that the relay timing is within limits, see Step 10 to determine the pre-selected 

relay timing by inspecting the thumbwheel settings and follow Step 11 to perform the 

test. 

4.6.3. AC Microchron II Timer Relay Timing Test 

The AC Microchron II Timer Relay Timing Test is performed during the AC Microchron II 

Timer Relay installation procedure in Table 3–5. 

To verify that the relay timing is within limits, see Step 8 to determine the pre-selected 

relay timing by inspecting the thumbwheel settings and follow Step 9 to perform the test. 


Troubleshooting 

5. SECTION 5 – TROUBLESHOOTING 

5.1. GENERAL PHILOSOPHY 

Troubleshooting helps to determine defective parts of equipment requiring repair or 

replacement. This is done through fault isolation diagrams and special instructions. 

5.2. GENERAL TROUBLESHOOTING 

General troubleshooting can be summarized as follows: 

• Understand and define the problem. 

• Confirm the problem. 

• Isolate the fault. 

• Perform corrective action. 

• Verify system operation. 

Standard troubleshooting, such as verifying wiring and energy, can be used to identify a 

failure. 

It is recommended that the following items be checked when troubleshooting a Type B 

relay problem: 

• Current Test Post (E Post) - check for tightness of spanner nut (if present, not all B 

relays have this post) 

• Plugboard Contacts - check that relay is properly seated 

• Voltage – check that it is provided to the coil 

5.3. RELAY TROUBLESHOOTING TOOLS 




5.4. FIELD TROUBLESHOOTING 

Troubleshooting procedures are provided in a logical order. The procedures must be 

performed in the given order to be correct. Any deviation from the order can result in an 

incorrect diagnosis or indication. This section covers only those troubles most frequently 

encountered during equipment operation. If a specific concern occurs that does not 

appear in this section, refer to the appropriate functional description in Section 2, and 

isolate the problem to a listed functional area or to a defective assembly or 

subassembly. 

Troubleshooting diagrams, in the form of fault isolation diagrams begin with a 

malfunction symptom. Then, based on observation/tests by the maintainer, the 

diagrams branch out to isolate probable causes of the malfunction. When a malfunction 

is external, a reference is given to refer the maintainer to the probable fault area for 

further troubleshooting. 

NOTE 

After performing replacements, repairs, or adjustments the maintainer 

must repeat the troubleshooting procedure. 

Troubleshooting symbols are described in Table 5–1. Fault isolation diagrams are 

provided as follows: 

• Figure 5–1, DC Relay Does Not Pick 

• Figure 5–2, DC Relay Does Not Release 

• Figure 5–3, AC Vane Relay Does Not Pick 

• Figure 5–4, AC Vane Relay Does Not Release 

• Figure 5–5, Microchron II Timer Relay (DC or AC) Does Not Pick 

• Figure 5–6, Microchron II Timer Relay (DC or AC) Does Not Pick 



Table 5–1. Troubleshooting Symbols 

Symbol 

Explanation 

Malfunction statement as derived from operator's report. 

Basic instruction for preparation of a test, procedure, or 

observation. The action taken results in a diagnostic 

decision. 

Result from previous action, which is answered yes or no. If 

result is within tolerance, answer yes. If not, answer no. Do 

not consider any gray areas between yes and no. 

Final step of instructions involving corrective measures. 

Reference publication indicates suspected problem area. 

Special instruction for continuation of troubleshooting 

diagram at referenced location. 



5.4.1. DC Relay Troubleshooting 

DC RELAY DOES 

NOT PICK UP 

CHECK FOR CORRECT 

VOLTAGE AT RELAY 

TEST TERMINALS 

(SEE WIRING DIAGRAM) 

YES 

OK? 

NO 

DOES 

RELAY HAVE 

SUPRESSOR UNIT? 

NO 

CHECK BOOK OF 

PLANS FOR 

RELAY LOGIC 

CIRCUITRY 

YES 

REPLACE SUPPRESSOR 

UNIT AND CHECK 

THAT RELAY PICKS UP 

YES 

OK? 

NO 

FAULT 

CORRECTED 



COIL TERMINALS 

(I.E. 3D, 3C, 3B, 3A, SEE 

WIRING DIAGRAM)) 

YES 

OK? 

NO 

REPLACE 

RELAY 

REPAIR RELAY 

PLUGBOARD 

WIRING 

Figure 5–1. DC Relay Does Not Pick 



DC RELAY DOES 

NOT RELEASE 

CHECK FOR VOLTAGE 

PRESENT AT RELAY 



YES 

OK? 

NO 

REFER TO 

BOOK OF PLANS 

FOR RELAY 

LOGIC 

CIRCUITRY 

REPLACE 

RELAY 

Figure 5–2. DC Relay Does Not Release 

NOTE 

Failure of a DC Relay to release with no voltage applied to the terminals 

could indicate a potential safety failure. Record the conditions and notify 

Alstom Signaling customer service as soon as possible. 



5.4.2. AC Vane Relay Troubleshooting 

AC VANE RELAY 

DOES NOT PICK UP 

CHECK FOR 

SPECIFIED TRACK 

VOLTAGE 

OK? 

NO 

REFER TO 

BOOK OF PLANS 

FOR RELAY 

LOGIC 

CIRCUITRY 

YES 

REMOVE RELAY FROM 

PLUG BOARD AND CHECK 

FOR SPECIFIED 

LOCAL VOLTAGE 

YES 

OK? 

NO 

REPLACE 

RELAY 

REPAIR 

PLUGBOARD 

WIRING 

Figure 5–3. AC Vane Relay Does Not Pick 



AC VANE RELAY 

DOES NOT 

RELEASE 

VOLTAGE 

PRESENT 

BETWEEN 

TERMINALS 1E 

AND 6E 

YES 

RELAY OPERATION 

IS NORMAL; 

REFER TO BOOK OF 

PLANS FOR RELAY 

LOGIC CIRCUITRY 

NO 

REPLACE 

RELAY 

Figure 5–4. AC Vane Relay Does Not Release 

NOTE 

Failure of an AC Relay to release with no voltage applied to the terminals 

could indicate a potential safety failure. Record the conditions and notify 

Alstom Signaling customer service as soon as possible. 



5.4.3. Microchron II Timer Relay Troubleshooting 

Both the AC and DC versions of the Microchron II Timer Relay contain a red LED and a 

green LED. 

The Red LED indicator is the TIMING/POWER ON indicator. It is lit when power is first 

applied. It will begin blinking OFF/ON at 1.0 second intervals until the delay set on the 

switches has expired. On the AC Microchron II Timer Relay, the final blink will be slightly 

quicker or longer depending on the tenth of second switch setting. Then the Red LED 

illuminates steady when the timing cycle is complete and power remains supplied. 

The Green LED indicator is the DELAY COMPLETE indicator. It is lit at the end of a 

delay. Once the delay has expired, the power that is driven through the Vital Relay 

Driver (VRD) tuned circuit to the vital relay also drives the Green LED to indicate the 

end of the delay. 

NOTE 

If the Microchron II Timer Relay completes its time cycle and the green 

LED illuminates, but the relay does not pick, check the relay coil 

connections. 

Failure of the green LED to illuminate, combined with a lack of relay 

energy following a correct timing interval could indicate a failure of the vital 

driver circuit. 



MICROCHRON II 

TIMER RELAY DOES 

NOT PICK UP 

DOES GREEN LED 

ILLUMINATE 

(OR BLINK)? 

YES 

DOES RED LED 

ILLUMINATE WHEN 

TIMING CYCLE IS 

COMPLETE AND POWER 

REMAINS SUPPLIED? 

OK? 

NO 


VOLTAGE AT TEST 

TERMINALS 


YES 

OK? 

NO NO 

OK? 

YES 

YES 

DID POWER 

REMAIN 

SUPPLIED? 

NO 

NO 

DOES RELAY 

HAVE FILTER 

UNIT? 

YES 

REPLACE FILTER 

UNIT AND CHECK 

RELAY PICKS AFTER 

DELAY 

CHECK BOOK OF 

PLANS FOR 

RELAY LOGIC 

CIRCUITRY 



COIL TERMINALS 

(I.E. 51, 52, SEE WIRING 

DIAGRAM) 

YES 

OK? 

NO 

NO 

NO 

OK? 

YES 

REPLACE 

RELAY 

REPAIR RELAY 

PLUGBOARD 

WIRING 

FAULT 

CORRECTED 

Figure 5–5. Microchron II Timer Relay (AC or DC) Does Not Pick 



MICROCHRON II 

TIMER RELAY DOES 

NOT RELEASE 

NO 

IS RED LED 

ILLUMINATED? 

YES 

CHECK FOR VOLTAGE 

PRESENT AT RELAY 



NO 

OK? 

YES 

REPLACE 

RELAY 

REFER TO BOOK OF 

PLANS FOR 

RELAY LOGIC 

CIRCUITRY 

Figure 5–6. Microchron II Timer Relay (AC or DC) Does Not Release 

NOTE 

Failure of a Microchron II Timer Relay to release with no voltage applied to 

the terminals could indicate a potential safety failure. Record the 

conditions and notify Alstom Signaling customer service as soon as 

possible. 


Corrective Maintenance 

6. SECTION 6 – CORRECTIVE MAINTENANCE 

6.1. GENERAL PURPOSE 

This section describes corrective maintenance procedures for Type B relays. Corrective 

maintenance is intended to restore malfunctioning equipment to an operable condition 

as quickly as possible. The procedures included in this section include: 

• Relay Removal and Replacement Procedures to remove relays not meeting 

inspection or electrical criteria 

• Relay Wiring Change Procedures for plugboards and terminals 

• Mechanical Test and Adjustment Procedures for relays removed from service 

Specifications for testing and inspecting all Alstom relays are given on relay Engineering 

Data (ED) sheets. Relay drawing and catalog numbers can be used with Appendix A to 

look up the Engineering Data (ED) Sheet number. To determine a relay's drawing or 

catalog number, refer to Heading 1.2.2., Identification For copies of ED sheets, consult 

your Alstom Sales Representative or Alstom Customer Service. 

Table 6–1. Corrective Maintenance Procedures 

Description 

Table 

B Relay Removal and Replacement Procedure 6–2 

Terminal Removal Procedure 6–3 

Terminal Installation Procedure 6–4 

Terminal Soldering Procedure 6–5 

Terminal Crimping Procedure 6–6 

Insulator Removal and Installation Procedure 6–7 

Current Test Terminal Wiring Procedure 6–8 

Voltage Test Terminal Wiring Procedure 6–9 

Relay Structure Inspection Procedure 6–10 

Mechanical Test and Adjustment Procedure (for standard B1 and 

B2 relays) 

6–11 

Microchron II Timer Electronics Removal Procedure 6–12 

Microchron II Timer Electronics Replacement Procedure 6–13 



6.2. CORRECTIVE MAINTENANCE TOOLS 


The Shop Test Rack, P/N 56573-002-01, is used to test relays in the shop. See 

Appendix C for details about the Shop Test Rack. 

6.3. REMOVAL AND REPLACEMENT PROCEDURES 

6.3.1. B Relay Removal and Replacement 

Table 6–2. B Relay Removal and Replacement Procedure 

Step 

Procedure 

1 To remove the B relay, loosen and remove two lock nuts from two guide rods. 

LOCK NUTS 

GUIDE RODS 

KNURLED 

NUTS 

2 Loosen and remove two knurled nuts from two guide rods. 

3 Grasping relay top and bottom with both hands, rock slightly from side to side to 

release the relay from plug connection. Remove relay. 

If an adjacent relay prohibits grasping the relay on top and bottom, use handle 

on front to pull relay along guide rods. 



Table 6–2. B Relay Removal and Replacement Procedure (Cont.) 

Step 

Procedure 

4 Check that the replacement relay is correct by verifying that the part number on 

the nameplate of relay matches the number on the plugboard registration plate. 

Remove nametag from defective relay and install on replacement relay. 

REGISTRATION 

PLATE NUMBER 

NAME 

PLATE 

NAMETAG 

TEST DATA 

FORM 

5 To replace the B relay, grasp the relay by the top and bottom of the cover; slide 

it onto the guide rods. 

If adjacent relay prohibits grasping of relay on top and bottom, use the handle 

on the front to push the relay along the guides. 




Step 

Procedure 

6 Press the relay firmly into place so that the back of the relay is snug against its 

plugboard. 

PLUGBOARD 

RELAY 

BASE 

CAUTION 

Do not exert excessive pressure on the relay. Pressure greater 

than finger pressure could damage relay or plugboard. 

7 Hold the relay in this position with one hand while putting on the knurled 

retaining nuts. The nuts should be tightened only until they just touch the end of 

the tube, but do not exert pressure against the relay. 

TUBE 

GUIDE ROD 

KNURLED 

NUTS 

KNURLED 

NUTS 

CAUTION 

DO NOT use the retaining nuts to pull the insulators and prongs 

into engagement. 




Step 

Procedure 

8 Screw on the lock nuts, holding the retaining nuts with the fingers to prevent 

their turning while tightening the lock nuts with an AAR wrench. 

LOCK NUTS 



6.4. WIRING AND PLUGBOARD CHANGES 

6.4.1. Terminal Removal and Installation 

To remove a terminal, follow the procedure in Table 6–3 in the order provided. 

Follow the procedure in Table 6–4 to install a terminal. 

Table 6–3. Terminal Removal Procedure 

Step 

Procedure 

1 Insert extractor P/N 59688-000-00 to raise the lock tab of the terminal so that it 

clears the shoulder on the insulator. 

SPRING BEAM 



EXTRACTOR 

INSULATOR 

LOCKING TAB 

LOCKING SHOULDER 

2 Pull on wire that is connected to terminal and withdraw terminal from plugboard. 

EXTRACTOR 

INSULATOR (P/N 59688-000-00) 

3 If no wire is attached to terminal, use long-nose pliers to extract terminal. 



Table 6–4. Terminal Installation Procedure 

Step 

Procedure 

1 Determine in which plugboard slot the terminal belongs. 

2 Insert terminal with lock tab against insulator. 

SPRING BEAM 



EXTRACTOR 

TERMINAL 

INSULATOR 

LOCKING TAB 

LOCKING SHOULDER 

Press in until lock tab clicks into place behind shoulder on insulator. 

3 Pull on wire to see if terminal is properly locked. This check is particularly 

important when using No. 10 wire. 

TERMINAL 



6.4.2. Terminal Wiring 

To wire a solder terminal, follow the procedure in Table 6–5. 

Follow the procedure in Table 6–6 to wire a crimped terminal. 

Table 6–5. Terminal Soldering Procedure 

Step 

Procedure 

1 Ring out the circuit for the right wire. Tag the wire. 

2 Strip wire insulation to expose 1/4 inch of bare wire. For wire sizes with outside 

diameters between 0.230 - .260 inches, strip off approximately 7/8 inch of the 

insulation and slide on rubber sleeve, P/N 35189-033-00, as shown: 

ROSIN 

CORE 

SOLDER 

INSULATION 

CLAMP 

WIRE 

CLAMP 

SLEEVE 

3 Clamp insulated portion of wire in one lug of terminal 55871-019-00. 

4 Clamp bare wire in the other lug. 

WARNING 

MAKE SURE THAT ALL STRANDS OF THE WIRE ARE 

CLAMPED UNDER THE LUG. LOOSE STRANDS EXTENDING 

THROUGH THE INSULATOR’S SPRING BEAM SLOT COULD 

CAUSE A SHORT CIRCUIT TO THE TERMINAL ON THE 

OPPOSITE SIDE OF THE INSULATOR. 

5 Heat the terminal at the bare wire until a small amount of solder flows to bond 

end of bare wire to terminal. Be aware that too much solder will jam lock tab. 

6 Proceed the same way to attach a second wire to the same terminal (if 

required). 

7 Inspect terminal to ensure no loose strands of wire are outside terminal lugs. 



NOTE 

For detailed instruction on use of crimp tool P/N 24745-148-00, including 

wire strip length, refer to Instructions Sheet 408-9904, produced by AMP, 

the tool manufacturer. 

Table 6–6. Terminal Crimping Procedure 

Step 

Procedure 

1 Strip wire insulation to expose bare wire to the length specified in the crimp 

tool's instruction sheet. Ring out circuit for this wire. Tag the wire. 

2 Select terminal 55871-098-00 for 10 - 14 AWG wire; use terminal 55871-074-00 

for 16 - 20 AWG wire. 

3 Place terminal in crimp tool P/N 24745-148-00, centering the terminal over 

correct crimp for AWG wire. 

4 Insert bare wire into terminal, keeping all strands inside barrel. 

WIRE CRIMP 

5 Crimp wire in terminal. 

CRIMP TERMINAL 

6 Repeat Steps 1 through 5 to attach a second wire to other terminal barrel (if 

required). 

7 Inspect crimps to ensure no loose strands of wire are outside the barrel of the 

terminal. 



6.4.3. Insulator Removal and Installation 

To remove and replace an insulator, follow the steps in Table 6–7 in the order provided. 

Table 6–7. Insulator Removal and Installation Procedure 

Step 

Procedure 

1 From the rear of the plugboard, squeeze the locking tab toward the insulator 

and push the insulator forward. 

LOCKING 

TAB 

SQUEEZE 

TOWARD 

INSULATOR 

2 Remove the insulator from the front of the plugboard. 

3 From the front of the plugboard, insert the new insulator end with the locking tab 

first. Push until the insulator is seated and the locking tab engages. The locking 

tab clicks when it engages. 

4 From the front of the plugboard, tug on the insulator to verify that the locking tab 

has engaged. 



6.4.4. Current Test Terminal Wiring 

To wire a current test terminal follow the procedure provided in Table 6–8. 

Table 6–8. Current Test Terminal Wiring Procedure 

Step 

Procedure 

1 Solder a wire jumper about eight inches long to connector. 

2 Pass wire from front of plugboard through hole next to current test terminal. On 

B1 plugboards this hole is to the right and below the one marked 3E. On B2 

plugboards, it is to the left and below the one marked 6E. 

3 Assemble current test terminal as shown: 

CONNECTOR 

04906-126-00 

SPANNER 

NUT 

TO CABLE 

WIRE JUMPER ABOUT 

8 INCHES LONG 

SOLDER WIRE JUMPER 

TO CONNECTOR 

TO COIL 

TERMINAL 

BEND AFTER WIRE 

IS ATTACHED 

ROSIN CORE SOLDER, 

SOLDER HERE 

DETAIL OF SOLDERED CONNECTION 

4 Slide connector into insulating bushing and at the same time push wire through 

hole. 

5 Tighten spanner nut with spanner nut wrench, P/N 55393-003-01, for B Relay 

Current Test Post (E Post). 

6 Bend end of connector against plugboard. 

7 Cut jumper wire to proper length and connect it to plugboard terminal. Refer to 

the detailed wiring plan. 

8 Put a terminal on the wire that comes from the cable and goes to that part of the 

test terminal that extends toward the back of plugboard. Connect them as 

shown in Step 3. 



6.4.5. Voltage Test Terminal Wiring 

To wire a voltage test terminal follow the procedure provided in Table 6–9. 

Table 6–9. Voltage Test Terminal Wiring Procedure 

Step 

Procedure 

1 Pass a wire jumper about eight inches long from front of plugboard through hole 

next to voltage test terminal. On B1 and B2 plugboards this hole is to the right 

and below the one marked 1E. Note that the space is provided on B2 

plugboards for more than one test terminal in cases where the coils in a relay 

have independent circuits. 

2 Put AAR ring terminals on wire and assemble to coil terminal as shown: 

TO CABLE 

TO COIL 

TERMINAL 

TO COIL 

TERMINAL 

WIRE JUMPER ABOUT 

8 INCHES LONG 

3 Cut jumper wire to proper length and connect it to plugboard terminal. Refer to 

the detailed wiring plan. 

4 Put terminals on the wires that come from cable and go to that part of test 

terminal that extends toward back of the plugboard. Connect them as shown. 



6.5. MECHANICAL TEST PROCEDURES 

The mechanical test procedures are performed to ensure that the relay structure is 

properly adjusted. Table 6–10 provides the Relay Structure Inspection Procedure. Table 

6–11 provides the Mechanical Test and Adjustment Procedure. 

The mechanical test and adjustment procedures take place with the B relay cover 

removed. These procedures include verification of armature air gap, bridge travel and 

contact group measurements. Components identified as not meeting defined tolerances 

during the relay mechanical test are adjusted during the test procedure. Mechanical 

adjustments must be followed by electrical tests to verify relay performance. 

WARNING 


THE RELAY. 



6.5.1. Relay Structure Inspection 

Before performing any adjustments or tests on a relay, the relay structure must be 

visually inspected. Section 7, Parts List, provides a comprehensive list and illustrations 

for all of the components of the typical B relay. This procedure applies to typical B 

relays and Microchron II Timer relays. 

Table 6–10. Relay Structure Inspection Procedure 

Step 

Procedure 

1 If any of the following conditions are not met, take note of the problem and 

correct it during the mechanical test. 

NOTE 

This procedure includes correcting identified problems. This 

procedure must be followed by relay mechanical and electrical 

tests. 


3 Break the cover seal and unscrew the knurled nuts. 

WARNING 

BREAKING THE RELAY COVER SEAL VOIDS THE WARRANTY 

ON THE RELAY. 

GUIDE ROD 

TUBE 

4 Remove the two round rubber washers and the cover. 

KNURLED 

NUTS 



Table 6–10. Relay Structure Inspection Procedure (Cont.) 

Step 

Procedure 

5 Remove contact group dust shield. Verify that the relay contact groups and 

mounting screws are tight. Tighten, if necessary. Replace contact group dust 

shield. 


COVER 




PUSHER 

BACK CONTACT 

HEEL CONTACT 

FRONT CONTACT 


BASE 

CONTACT GROUP 


STOP PLATES 

PUSHER JAW 



ARMATURE 

ARMATURE 

RETAINING 

PLATE 

ADJ. NUT 

LOCK NUT 

YOKE 

NUT 

ARMATURE 

BEARING 

PLATE 

NAME 

PLATE 

SAFETY 

PIN 

COIL 


PLATES PRONGS 


CORE 



6 Verify that the pusher retaining clips are properly assembled and do not bind on 

pusher, thus allowing free movement of pusher. The pusher clips cannot be 

adjusted or reassembled, replace if necessary. 

7 Verify that the pusher is not bent, broken or cracked due to being forced on the 

bridge (armature extension). Replace, if necessary. 



Table 6–10. Relay Structure Inspection Procedure (Cont.) 

Step 

Procedure 

8 Verify that each pusher does not rub against the contact springs or stop in any 

position. Adjust, if necessary. 

9 Verify that the armature does not bind, and rides properly on the armature 

bearing plate. Clearance between the front face of the armature and the edge of 

the armature retaining plate is .002 inches minimum and .004 inches maximum, 

for any position of the armature. Adjust, if necessary. 

10 Verify that the compression spring does not rub on stud in any position of the 

armature. Adjust, if necessary. 

11 Verify that the compression spring fits properly against shoulder on lock nut. 

Adjust, if necessary. 

12 Verify that the lock nut is properly in place on coil spring stud. Reseat and 

tighten, if necessary. 



6.5.2. Mechanical Test and Adjustment Procedure 

The Mechanical Test and Adjustment Procedure provided in Table 6–11 applies to 

standard B1 and B2 relays, not specialty relays. 

Table 6–11. Mechanical Test and Adjustment Procedure 

Step 

Procedure 

1 Inspect the relay components by following the procedure in Tables 6–10. 

NOTE 

If the relay is a Microchron II Timer Relay (AC or DC), first remove 

the timer using the procedure provided in Table 6–12. 

2 Mount the relay onto Shop Test Rack or on a plugboard, supporting it about 18 

inches above a bench on a plugboard holding stand. 

Secure the relay with two retaining nuts to hold the relay in place. 

Example Shop Test Rack 

G 

16 26 36 

15 25 35 

14 24 34 

13 23 33 

12 22 32 

11 21 31 

46 56 66 

45 55 65 

44 54 64 

43 53 63 

42 52 62 

41 51 61 

E 

F 

6C 

6D 

D 

C 

1C 

1D 

6C 

6D 

C 

D 

A 

B 

X 

This rack is designed for both B1 and B2 relays. One of the guide rods is 

removable. For testing B1 relays, screw the removable guide rod into location F. 

For testing B2 relays, screw it into location E. Meter leads should have alligator 

clips for clipping on to terminal posts G. 

3 Proceed with this procedure to check the following areas to verify that all 

adjustments are proper: armature air gap, bridge travel, back and front contact 

make and break, contact openings and pressures. 

4 Energize the relay when required. To power the relay, apply a variable current 

source to the coil leads (one coming from each relay coil), utilizing a meter tip 

plug to interface the current source with the female cap connectors on the coil 

leads. Refer to the relay wiring diagram if necessary. 



Table 6–11. Mechanical Test and Adjustment Procedure (Cont.) 

Step 

Procedure 

5 Verify the armature air gap measurement is as specified on the specific relay’s 

ED sheet. A feeler gauge of the same thickness as the specified air gap must 

pass freely between the armature and core heads at any point, except at the 

fixed safety pins, when the relay is energized. 

ARMATURE 

CORE 

SAFETY PINS 

LOCATED AT 

THE CORE 

HEADS 

CORE 

6 If the armature air gap is not acceptable, adjust the armature gap with the 

adjustable residual screw to obtain the required air gap. The screw must be 

locked tight in place by the lock nut provided. 

7 Verify the bridge travel measurement is as specified on the specific relay’s ED 

sheet. 

Use a feeler gauge of the same thickness as the specified air gap to verify the 

air gap between the bracket and the armature stop screw when the relay is 

energized. 

ARMATURE 

STOP SCREW 

GAP 

BRACKET 




Step 

Procedure 

8 If the bridge travel is not acceptable, adjust the bridge travel. Turn the armature 

stop screw until the bridge travel measurement is within specification. The screw 

must be locked tight in place by the lock nut provided. 

Generally, operating values of a relay are easier to obtain when this air gap is 

held to the minimum value. 

9 Make and break openings for front and back contacts are measured by inserting 

the proper thickness gauge between the adjustable residual screw and core 

face. 

• With the break gauge in place, all specified contacts are open. 

• With the make gauge in place, all specified contacts are closed. 

2 FRONT 

CONTACTS 

BACK CONTACT 

10 Verify the contact opening measurements meet the specifications indicated in 

the appropriate ED sheet. 

11 If the contact opening measurements are not acceptable, bend the pressure 

plate forcing the contact spring to the proper position to meet the acceptable 

make and break values. 

With the contact spring properly positioned, the stop plate is bent toward the 

contact spring until it just touches the spring. Note that the spring bears against 

the pressure plate and touches the stop plate. 

If a pressure plate or stop plate is bent too far away from a contact spring, this 

can be corrected by bending the plate to stop a little too near the spring and 

then bend the plate away from the spring. 

12 Use a pressure gauge to verify the contact pressure meets the specifications 

indicated in the appropriate ED sheet. 

When making contact pressure measurements, place the pressure as close to 

the contact as possible (at the center of the extreme outer end of the spring) to 

obtain a true reading. Back contact springs must move a minimum of 0.010 inch 

from the stop plate; this measurement is taken at the end of the stop plate. 




Step 

Procedure 

13 If the contact pressure is not acceptable, manually adjust the pressure plate and 

stop plate. 

PRESSURE 

PLATES 

STOP 

PLATES 

Contact pressure is created by contact follow resisted by the pressure plate. 

Contact follow is the total movement of the heel contact caused by the armature 

bridge raising the pusher (not affected by pressure or stop plates). Armature 

springs (heel contact spring) are adjusted with a down pressure before 

assembling the pusher. 

The adjustment of the contact group consists of positioning the pressure plate 

and stop plate on each stationary spring to ensure the correct amount of contact 

follow. 

Armature springs on all groups are adjusted with a down pressure. 

14 Using a pressure gauge at the adjustable residual screw, check the pressure 

required to just raise the bridge stop screw from its stop. Compare pressure 

value to the requirements indicated on the ED sheet. Adjust if necessary. 





Step 

Procedure 

15 Check that all armature springs on the contact block are adjusted with a down 

pressure. It is important to keep the down pressure about the same on all back 

contacts. Each roller on the contact spring bears on the bottom of its slot in the 

pusher, when the pusher is raised sufficiently to just open the back contacts. 

Typical B Relay 


COVER 




PUSHER 

BACK CONTACT 

HEEL CONTACT 

FRONT CONTACT 


BASE 

CONTACT GROUP 


STOP PLATES 

PUSHER JAW 



ARMATURE 

ARMATURE 

RETAINING 

PLATE 

ADJ. NUT 

LOCK NUT 

YOKE 

NUT 

ARMATURE 

BEARING 

PLATE 

NAME 

PLATE 

SAFETY 

PIN 

COIL 


PLATES PRONGS 


CORE 






Step 

Procedure 

16 Insert a .010 inch feeler gauge under the armature stop screw to hold the back 

contacts open. Using a smaller bar under the bottom of the pusher, gently push 

up on the bar to see that the pusher rises slightly, without moving the armature. 

While holding the armature in this position, verify that the roller on each heel 

spring rests on the bottom of the jaw in the pusher. 

17 Adjust the springs, if necessary, so they always open the front contacts in case 

of a failure at the bottom end of the pusher. 

18 For Microchron II Timer Relays, follow the electronics replacement procedure 

provided in Table 6–13, and then continue with Step 19. 

For all other relays, place the cover on the relay. Verify that the gasket in the 

base groove is seated properly and then assemble the two gasket washers over 

the relay support tubes. Install and tighten the knurled nuts and apply the seal. 

19 Check the contact prong spacing on the back of the relay with the appropriate 

gauges: P/N 56260-008-01 and P/N 56260-010-01. 

20 Follow the electrical test procedure for the relay, provided in Section 4. 



6.5.3. Microchron II Timer Relay Electronics Removal and Replacement 

Before performing tests on the relay portion of the Microchron II Timer Relay, the timer 

electronics must be removed from the relay structure. The timer electronics if referred to 

as the Motherboard for the DC version of the relay, and the Timer board for the AC 

version. 

NOTE 

The location of the timer electronics is on the left side of the relay as you 

face the front of the DC version of the relay and on the right side of the 

relay as you face the front of the AC version of the relay. 

Perform the procedures in the sequence provided. 

WARNING 


THE RELAY. 



Table 6–12. Microchron II Timer Electronics Removal Procedure 

Step 

Procedure 

1 Remove the relay cover and seal. 

2 Detach the white, four-position connector, P1 (located close to the relay base) 

from the Motherboard (DC version) or Timer board (AC version) by squeezing 

the side tabs while firmly pulling it away from the board. 

Front View of DC Relay 

P1 

P2 

VIEW SHOWN WITH SWITCH BOARD _ 

AND BRACKET REMOVED 

Top View of AC Relay 

(J1) 

(P1) 

(P2) 



Table 6–12. Microchron II Timer Electronics Removal Procedure (Cont.) 

Step 

Procedure 

3 For the AC version of the relay, detach the smaller, white, square shaped 4- 

position connector P2 from the bottom of the Thumbwheel board, by squeezing 

the side tab while pulling the connector away from the Thumbwheel board. 

Locate the black bracket securing the electronics package to the relay base. 

Remove and save the two flathead screws that hold the bracket to the base. Put 

the two flathead screws and washers in a safe place. 

(J1) 

(P1) 

SCREWS 

(P2) 

BRACKET 

Carefully set the electronics package/bracket assembly aside and continue to 

step 5. 

For the DC version of the relay, go to step 4. 

4 For the DC version of the relay remove the Motherboard and carefully set the 

board aside. 

NOTE 

Always handle printed circuit boards at a static safe station. 

Continue to step 5. 



Table 6–12. Microchron II Timer Electronics Removal Procedure (Cont.) 

Step 

Procedure 

5 Locate the relay coil drive connections within the free hanging, four position (P1) 

Motherboard connector. 

Side View of AC Relay 

1 

(P2) 

(J1) 

34 

(P1) 

4 

3 

2 

1 

6 Relay electrical tests are performed using the wires indicated in Step 5. 



Table 6–13. Microchron II Timer Electronics Replacement Procedure 

Step 

Procedure 

1 For the DC version of this relay install the Motherboard and go to Step 5. 

NOTE 

Always handle printed circuit boards at a static safe station. 

For the AC version of this relay, go to Step 2. 

2 Place the electronics package/bracket assembly onto the relay base. 

3 Confirm that the wires to the white, 4-position connector run through the notch in 

the bracket. 

4 Use the two flathead screws and washers from Step 3 of Table 6–12, the Timer 

Electronics Disconnect and Removal Procedure, to secure the assembly to the 

relay base and tighten firmly. 

5 Connect the smaller, square shaped, 4-position connector P2 to the 

thumbwheel board. The connector is keyed and only fits in one position. 

Top View of AC Relay 

(J1) 

(P1) 

(P2) 

6 Connect the four-position connector, P1 (located close to the relay base) from 

the Motherboard (DC version) or Timer board (AC version). 

7 Visually inspect the relay to verify that no wires are pinched between the relay 

base and the Motherboard (DC version) or Timer board (AC version). 



Table 6–13. Microchron II Timer Electronics Replacement Procedure (Cont.) 

Step 

Procedure 

8 Check for correct operation of the relay. 

NOTE 

If the relay completes its cycle (showing steady red LED during 

cycle) and then the green LED starts blinking but the relay does 

not pick, check the relay coil connections. 

9 Install the relay cover and seal the relay. 


Parts Catalog 

7. SECTION 7 – PARTS CATALOG 

7.1. GENERAL 

This section identifies and lists the component parts that may be ordered to repair the 

Alstom family of B relays at the shop level. It also includes a list of the plugboards and 

other relay parts required for installation. Parts are identified by drawing number and 

catalog number (where available) except for common hardware items that are identified 

by a generic description. All drawing numbers consist of 10 digits. Drawing numbers are 

equivalent to part numbers. Some parts do not have a catalog number. 

7.2. PARTS LIST 

Each illustration of B relay components is followed by a parts list giving part description, 

drawing number and catalog numbers of replaceable parts. Index numbers are listed to 

locate referenced parts in the illustration. Where applicable, references are provided to 

other pages to better show where parts are located in the assembly. This section of the 

manual covers all currently manufactured parts. 

Table 7–1. B Relay Drawings and Parts Lists 

Description Figure No. Table No. 

B1 Neutral and Biased-Neutral Relay 7–1, 7–2 7–2 

B1 Code-Responsive Relay 7–3 7–3 

B1 Slow Pickup, Slow-Release, Quick-Crossover and 

Electronically-Driven Highway Crossing Flasher Relay 

7–4, 7–5 7–4 

B2 Neutral Relay 7–6 7–5 

B2 Biased-Neutral Relay 7–7 7–6 

B2 AC Vane Relay 7–8, 7–9 7–7, 7–8 

B2 Code Rate Transmitter Relay 7–10 7–9 

B2 Microchron II Timer Relay (DC) 7–11 7–10 

B2 AC Microchron II Timer Relay 7–12 7–11 

VTB Polar-Biased Relay 7–13 7–12 

Coils and Springs — 7–13 

Contact Groups 7–14, 7–15 7–14 

Contact Group Pushers and Clips — 7–15 

Plugboards and Supplies 7–16, 7–17 7–16 

Registration Plates and Gaskets 7–18 7–17 


Parts Catalog 

7.3. B1 NEUTRAL RELAYS 

B1 

Figure 7–1. B1 Neutral Relays 


Parts Catalog 

7.4. B1 BIASED-NEUTRAL RELAYS 

B1 

Figure 7–2. B1 Biased-Neutral Relays 


Parts Catalog 

Table 7–2. B1 Neutral and Biased-Neutral Relay Part Numbers 

Ref. Description Drawing No. Catalog No. 

A BASE, includes tubes for studs 56013-016-02 P62-0506 

B 

B1 

C 

C1 

CONTACT GROUPS (See Figure 7–14 and 

Table 7–13) 

SCREW, for attaching contact groups,.138" 

–40X .625" long, flat head 

ARMATURE, includes bridge and residual 

screw and all riveted parts; for all Type B1 

Neutral Relays 

ARMATURE, includes bridge and residual 

screw and all riveted parts; for all Type B1 

Biased-Neutral Relays 

— — 

03306-120-ON P62-0200 

39043-022-01 P62-0312 

39043-017-01 P62-0311 

1 COVER 56029-096-00 P62-0579 

2 NUT LOCK, for nut (Ref. 3) 56024-000-00 P62-0575 

3 NUT, knurled 00846-023-00 P62-0142 

4 SPRING, for setting over pressure (specify 

drawing no. of relay where part is used) 

— — 

5 ARMATURE RETAINING PLATE 55914-001-00 P62-0473 

5A SCREW, slotted pan-head, .164" -32 x .31" 

long, with patch 

02430-036-00 N/A 

6 WASHER, rubber 30646-012-00 P62-0260 

7 NUT, knurled, for holding cover in place 56026-004-00 P62-0578 

8 SEAL, for relay 35285-000-00 P62-0299 

9 HOLDER, for Test Data Form 50023-039-00 P62-0356 

9A 

SCREW, .112" –24 x .38" long, pan head, 

tap 

06604-212-ON P62-0593 

10 RESIDUAL SCREW, .190" -48 x .33" long 20360-014-00 P62-0255 

10A NUT, for residual screw, .190" -48 x .09" 

thick, hex 

00577-021-00 P62-0128 

11 TEST DATA FORM 51553-088-00 P62-0383 

11A TEST DATA FORM for Switch-Overload 

Relay 

51553-100-00 P62-0383 

12 NAME PLATE BLANK 00401-942-00 P62-0110 

12A SCREW, .112" -40 x .19" long, pan head, 

Nylok 

02430-038-00 P62-0442 


Parts Catalog 

Table 7–2. B1 Neutral and Biased-Neutral Relay Part Numbers (Cont.) 


13 WASHER, for .563" diameter cores 01225-094-00 P62-0156 

13A WASHER, for .736" diameter cores 01225-103-00 P62-0157 

13B WASHER, fiber for .563" diameter cores 34017-031-00 P62-0293 

15 SPRING WASHER, for .563" diameter 

cores 

15A SPRING WASHER, for .736" diameter 

cores 

01225-104-00 P62-0158 

01255-105-00 P62-0159 

16 ARMATURE BEARING PLATE 55912-001-00 P62-0470 

16A SCREW, stainless steel, slotted, pan head, 

.112" -40 x .250" long, with patch 

17 COIL, top or bottom (specify drawing no. of 

relay where part is used) 

18 ARMATURE SCREW, .164" -32 x .63" long, 

fillister head 

02430-037-00 N/A 

— — 

01054-004-00 P62-0150 

18A NUT, thin hex elastic stop, .164" -32 42333-055-00 P62-0321 

19 SLUG, full-length for .563" diameter core 54960-003-00 P62-0425 

19A SLUG, half-length for .563" diameter core 54960-004-00 P62-0426 

19B SLUG, full-length for .736" diameter core 54960-005-00 P62-0427 

19C SLUG, half-length for .736" diameter core 54960-006-00 P62-0428 

20 SCREW, for mounting cores, .313" -24 x 

1.0" long, SEMS 

21 SCREW, for mounting contact group, .138"- 

40 x .63" long, slotted, fillister head 

23 TAG BLANK, for circuit designation 

contains 60 blank tags 

25 ARMATURE SCREW, .164" -32 x 1.0" long, 


28 MAGNET, for old-style relays, 2 required, 

charged to 84-86 points 

28A MAGNET, replacement for new- and oldstyle 

relays,1 required 

53141-025-00 P62-0844 

03306-120-ON P62-0215 

55085-208-00 P62-0432 

01054-011-00 P62-0151 

53007-043-00 P62-0822 

53007-058-00 P62-0818 

30 LEAKAGE STRIP 58898-008-00 P62-0675 

31 GASKET, for sealing coil cap opening 30646-005-00 P62-0276 

32 SHIELD, for covering contact groups 50737-091-00 P62-0227 


Parts Catalog 

Table 7–2. B1 Neutral and Biased-Neutral Relay Part Numbers (Cont.) 


33 GASKET, for between cover and base 13014-221-00 P62-0225 

34 YOKE 01224-038-00 N/A 


Parts Catalog 

7.5. B1 CODE-RESPONSIVE RELAY 

B 

B1 

Figure 7–3. B1 Code-Responsive Relay 


Parts Catalog 

46 (1F) 

46A (1FB) 

46B (1B) or (1R) 

46C (1F) or (1N) 

46D (1FB) 

46E (1FB) 

Figure 7–3. B1 Code-Responsive Relay (Cont.) 


Parts Catalog 

46F 

Figure 7–3. B1 Code-Responsive Relay (Cont.) 


Parts Catalog 

Table 7–3. B1 Code-Responsive Relay Part Numbers 


A BASE, complete, includes tubes 56013-016-04 P62-0508 

B CONTACT GROUP 57508-KN N/A 

B1 SCREW, for attaching contact groups, .138" 

-40 x .625" long, flat head 

03306-120-ON P62-0200 

1 NAME PLATE 00401-281-00 P62-0113 

2 SCREW, slotted, fillister head .190" -32 x 

1.25" long 

2A WASHER, internal tooth, .190" I.D., .381" 

O.D., .025" thick 

3 RESIDUAL ARMATURE SCREW, 

headless, .242" -40 x .34" long 

4 CONNECTOR, flexible, copper, approx. 1- 

foot long 

03410-140-ON P62-0219 

53029-003-00 P62-0973 

05100-033-00 P62-0198 

42760-112-01 P62-0327 

5 TEST DATA FORM, paper 51553-048-00 P62-0387 

5A 

TEST DATA FORM, for Polar-Stick Relays, 

paper 

6 NUT, for spring (Ref. 8), .242" -40 x .190" 

thick 

51553-049-00 P62-0388 

00846-039-00 P62-0693 

7 SUPPORT, for spring (Ref. 8) 54302-004-01 P62-0417 

8 ARMATURE SPRING, for all Code- 

Responsive Relays except the following: 

8A ARMATURE SPRING, for A62-0323 

(56001-670-13), A62-0519 (56001-679-06) 

8B ARMATURE SPRING, for A62-0567 

(56001-681-06), A62-0655 (56001-670-02), 

A62-0679 (56001-675-01) 

9 SCREW, for spring (Ref. 8), .242" -40 x 

.190" long 

10 TERMINAL BLOCK MOUNTING SCREW, 

.164" -32 x .30" long, fillister head 

10A WASHER, .174" I.D., .293" O.D., .031 " 

thick 

00586-149-00 P62-0135 

00586-138-00 P62-0782 

00586-145-00 P62-0848 

46453-002-00 P62-0340 

55160-033-00 P62-0440 

01273-003-ON P62-0334 

11 ARMATURE 29523-051-00 P62-0272 

11A ARMATURE, for Polar-Stick Relays 29523-072-00 P62-0273 


Parts Catalog 

Table 7–3. B1 Code-Responsive Relay Part Numbers (Cont.) 


12 SCREW, stainless steel, slotted, .164" -32 x 03408-010-ON P62-0435 

.31 " long 


O.D., .023" thick 

53029-068-00 P62-0402 

13 TUBE, for connector 43131-049-00 P62-0335 


15 WASHER, for coils 01225-170-00 P62-0163 

16 INSULATED TERMINAL BLOCK PLATE 30220-038-00 P62-0274 

17 MAGNET (specify drawing no. of relay 

where part is used) 

18 COIL, top or bottom (specify drawing no. of 


— — 

— — 

19 RELAY YOKE 01224-020-00 P62-0153 

20 SPRING, for magnets 00586-153-00 P62-0136 

21 BUSHINGS, for cores 06714-263-00 P62-0206 

23 SCREW, for short core, .313" -24 x 2.75" 

long, hex head cap 

23A LOCK WASHER, internal tooth for a .313" 

screw 

24 CONTACT BLOCK, with four contact 

supports (no contacts) 

03440-044-00 P62-0181 

53029-076-00 P65-0729 

57506-001-01 P62-0652 

25 CONTACT, silver-platinum 51321-023-00 P62-0361 

25A CONTACT, tungsten 51321-024-01 P62-0849 

26 PLATE, for contact fingers 55911-013-00 P62-0467 

27 SCREW, for fastening fingers to insulation 55718-001-00 P62-0456 

27A NUT, for screw (Ref. 27), .138" -40 x .09" 

thick, hex 

03614-007-00 P62-0183 

27B LOCK WASHER, for screw (Ref. 27) 01601-122-00 P62-0173 

28 FINGER, heel, with silver-platinum contacts 54614-034-01 P62-0421 

28A FINGER, heel, with tungsten contacts 54614-034-02 P62-0850 

29 TERMINAL BLOCK 47508-128-00 P62-0343 

30 SCREW, for long core, .313" -24 x 1.0" 

long, hex head cap 

03440-085-00 P62-0851 

31 SPACER, for magnets 38165-064-00 P62-0306 


Parts Catalog 



32 NUT, for screw (Ref. 33), .138" -40 x .09" 03614-007-00 P62-0183 

thick, hex 

33 SCREW, slotted, fillister head .138" -40 x 

.75" long 

34 NUT, for screws (Ref. 3,33), .242" -40 x .09" 

thick, hex 

35 NUT, for screw (Ref. 33) .242" -40 x .16" 

thick, hex 

46 CONTACT GROUP, 1 independent front, 

(tungsten) 

46A CONTACT GROUP, 1 dependent front & 

back (tungsten) 

46A CONTACT GROUP, 1 dependent front 

(silver platinum), 1 dependent back 

(tungsten) 

46A CONTACT GROUP, 1 dependent front & 

back (silver platinum) 

46B CONTACT GROUP, 1 independent front or 

normal (silver platinum) 

46C CONTACT GROUP, 1 dependent back or 

reverse (silver platinum) 

46D CONTACT GROUP, 1 dependent front & 

back (silver platinum) 

46E CONTACT GROUP, 1 dependent front & 

back (silver-impregnated carbon to silver) 

46F SCREW, for attaching contact groups, .138" 


03406-124-ON P62-0454 

53084-003-00 P62-0411 

39549-008-00 P62-0315 

58641-011-05 N/A 

58641-011-02 P62-0855 

58641-011-03 N/A 

58641-011-01 P62-0854 

58641-012-02 P62-0857 

58641-012-01 P62-0856 

58641-011-04 N/A 

58641-010-01 P62-0663 

06606-120-ON P62-0200 

48 NAME PLATE 00401-612-00 P62-0116 

48A SCREW, self-tapping, slotted .112" x .25" 

long 

54392-001-00 P62-0419 

48B WASHER, .156" I.D., .313" O.D., .031" thick 01250-004-ON P50-0422 

49 TUBING, 5mm x 1.25" long 55557-000-00 P62-0450 

49A TUBING, 7mm x 1.25" long 55557-004-00 P62-0451 

51 DUST SHIELD, for contact groups 50737-091-00 P62-0227 

52 GASKET, for between cover and base 13014-221-00 P62-0225 


Parts Catalog 



53 GASKETS, for between cover and knurled 30646-012-00 P62-0277 

nut 

54 COVER, with integral handle 56029-096-00 P62-0579 

57 PUSHER 58643-000-00 P62-0664 


Parts Catalog 

7.6. B1 SLOW PICKUP, SLOW-RELEASE AND QUICK CROSSOVER RELAYS 

7A 

7B 

SECTION B-B 

20 

Figure 7–4. B1 Slow Pickup, Slow-Release and Quick Crossover 


Parts Catalog 

7.7. B1 ELECTRONICALLY DRIVEN HIGHWAY CROSSING RELAY AND FLASHER 

MODULE 

11, 11A 

8, 8A, 8C, 8D 

(+) VOLTAGE 

(-) VOLTAGE 

8B 

Figure 7–5. B1 Electronically Driven Highway Crossing Relay and Flasher Module 


Parts Catalog 


Driven Highway Crossing Relay and Flasher Part Numbers 


1 SPRING, for setting back-contact pressure 00586-095-00 P62-0131 

2 YOKE 01224-025-00 P62-0154 

2A SCREW, .138" -40 x .88" long, slotted 


03406-128-ON P62-0453 

3 SCREW, stop for armature, .242" -40 x 

.344" long, flat point 

3A 

NUT, for armature stop screw, .242" -40 x 

.13" thick, hex 

05100-033-00 P62-0198 

53084-001-00 P62-0410 

4 SHUNT STRIP, two required 17378-023-00 P62-0243 

5 SHIM, 0.002" thick, eight required 53879-017-00 P62-0413 

5A SHIM, 0.003" thick, eight required 53879-018-00 P62-0414 

5B SHIM, 0.010" thick, four required 53879-019-00 P62-0415 

6 COIL, bottom, 124 ohms 56015-012-14 P62-0531 

6A COIL, bottom, 230 ohms 56015-011-15 P62-0530 

7 CONTACT GROUP, 2FB (silver-cadmiumoxide) 

7A 

CONTACT GROUP (See Figure 7–14 and 

Table 7–14) 

7B SCREW, for attaching contact groups, .138" 


8 RELAY FLASHER MODULE, electronic, 48- 

54 flashes per minute, includes modification 

kit for attaching module to relay plugboard. 

Can drive 1, 2 or 3 60 ohm Alstom 

FLASHER RELAYS. (SEE NOTE.) 

8A 

8B 

RELAY FLASHER MODULE, same as Ref. 

8, except 56-64 flashes per minute. (SEE 

NOTE.) 

KIT, modification kit containing hardware for 

mounting module: long e-posts, spacers, 

AAR nuts, AAR washers. 

56012-108-40 P62-0500 

— — 

03306-120-ON P62-0200 

30733-003-01 P62-0769 

30733-003-02 P62-0784 

17550-071-01 P62-0816 


Parts Catalog 


Driven Highway Crossing Relay and Flasher Part Numbers (Cont.) 


8C RELAY FLASHER MODULE, electronic, 48- 

54 flashes per minute, includes modification 

kit for attaching module to relay plugboard. 

Can drive one 18 ohm Alstom FLASHER 

RELAY. (SEE NOTE.) 

30733-003-03 P62-0861 

8D 

RELAY FLASHER MODULE, same as Ref. 

8C, except 56-64 flashes per minute. (SEE 

NOTE.) 

30733-003-04 P62-0862 

9 SPRING, for setting back-contact pressure 00586-056-00 P62-0130 

11 COIL, 18.0 ohms 56015-022-10 P62-0770 

11A COIL, 60.0 ohms 56015-008-27 N/A 

12 YOKE 01224-037-00 P62-0824 

NOTE 

For additional information on Alstom flasher modules, request Sales 

Bulletin SB-00003-001-00 from your Sales Representative or Alstom 

Customer Service. 


Parts Catalog 

7.8. B2 NEUTRAL RELAY 

8.50 

7.59 

63A 

20 

1C 

1D 

Figure 7–6. B2 Neutral Relay 


Parts Catalog 

Table 7–5. B2 Neutral Relay Part Numbers 


1 BASE, complete 56013-019-02 P62-0510 

2 CORE & BRACKET 56014-004-01 N/A 

3 ARMATURE, includes residual screw with 

jam nut, bridge travel screw with jam nut, 

bridges and safety pins 

39043-013-03 P62-0310 

4 COVER, w/Handle 56029-102-00 N/A 

5 YOKE 01224-012-00 P62-0830 



53141-025-00 P62-0844 

9 SCREW, .164-32 x .875 long with patch 02430-033-00 N/A 

10 NUT, .164-32 x .130 thick, hex 01272-005-ON P85-0276 

12 WASHER, flat, .172" I.D., .375" O.D., .031" 

thick 

01250-006-ON P62-0696 



15 SCREW, .164" -32 x .313" long with patch 02430-036-00 N/A 


18 NUT, .190-32 x .187 thick, lock, knurled 00846-023-00 P62-0142 

19 NUT, lock 56024-000-00 P62-0575 

20 SCREW, to hold contact groups, .138" -40 x 

,625" long, flat head 

03306-120-ON P62-0200 

21 RELAY SEAL 35285-000-00 P62-0299 

22 NAME PLATE 00401-194-00 P62-0111 

23 SCREW, for name plate, .086" -56 x .188" 

long 

03602-006-ON P62-0442 

24 SPRING WASHER, to keep coils tight 01225-105-00 P62-0159 

25 SCREW, .112" -40 x .25" long, with patch 02430-037-00 N/A 

27 HOLDER 50023-039-00 P62-0356 

29 SCREW, for holder (Ref. 10), .112" -40 x 

.375" long, self-tapping 

06604-212-ON P62-0594 


37 GASKET, between cover and base 13014-222-00 P62-0226 

38 SHIELD, for contact groups 50737-091-00 P62-0227 


Parts Catalog 

Table 7–5. B2 Neutral Relay Part Numbers (Cont.) 


39 GASKET, for coils 30646-005-00 P62-0276 

40 GASKET, between nut (Ref. 14) and cover 

(Ref. 4) 

42 WASHER, internal tooth, .086" I.D., .200" 

O.D., .015" thick 

60 COIL (specify drawing no. of relay where 

part is used) 

62 SPRING (specify drawing no. of relay where 

part is used) 

63 CONTACT GROUP (specify drawing no. of 


63A SCREW, for attaching contact groups, .138" 


67 WASHER, Copper (specify drawing no. of 

relay where part will be used) 

68 SLUG, Copper (specify drawing no. of relay 




30646-012-00 P62-0277 

53029-064-00 P62-0408 

56015 KN N/A 

00586 KN N/A 

56012 KN N/A 

03306-120-ON P62-0200 

01225 KN N/A 

54960 KN N/A 

55085-208-00 P62-0432 


Parts Catalog 

7.9. B2 BIASED-NEUTRAL RELAY 

8.50 

7.59 

SECTION THRU CORES AND 

MAGNETS LOOKING DOWN 

ON CORES NORTH TO RIGHT 

63A 

Figure 7–7. B2 Biased-Neutral Relay 


Parts Catalog 

Table 7–6. B2 Biased-Neutral Relay Part Numbers 


1 BASE, complete 56013-019-02 P62-0510 


3 ARMATURE, includes residual screw with 

jam nut, bridge travel screw with jam nut, 

bridges and safety pins 

39043-013-03 P62-0310 

4 COVER, w/Handle 56029-102-00 N/A 

5 YOKE 01224-012-00 P62-0830 



53141-025-00 P62-0844 

9 LEAKAGE STRIP 58898-007-00 P62-0674 

10 BRACKET 58897-002-00 P62-0672 

11 WASHER, for Ref. 49 01273-022-ON N/A 



53007-029-00 P62-3099 



15 SCREW, .164" -32 x .313" long with patch 02430-036-00 N/A 


18 NUT, .190-32 x .187 thick, lock, knurled 00846-023-00 P62-0142 

19 NUT LOCK 56024-000-00 P62-0575 

20 SCREW, to hold contact groups, .138" -40 x 

.625" long, flat head 

03306-120-ON P62-0200 

21 RELAY SEAL 35285-000-00 P62-0299 

22 NAME PLATE 00401-194-00 P62-0111 

23 SCREW, for nameplate, .086" -56 x .125" 

long 

24 WASHER, .653 I.D., 1.391 O.D., .022 thick, 

spring 

03602-004-ON P62-0695 

01225-104-00 P62-0158 

25 SCREW, .112" -40 x .25" long, with patch 02430-037-00 N/A 

27 HOLDER 50023-039-00 P62-0356 

29 SCREW, for holder (Ref. 27), .112" -40 x 

.375" long, self-tapping 

06604-212-ON P62-0594 



Parts Catalog 

Table 7–6. B2 Biased-Neutral Relay Part Numbers (Cont.) 


36 WASHER, internal tooth, .190" I.D., .381" 53029-003-00 P62-0973 

O.D., .025" thick, shk'proof 


38 SHIELD, for contact group 50737-091-00 P62-0227 

39 GASKET, for coils 30646-005-00 P62-0276 

40 GASKET, between nut (Ref. 14) and cover 30646-012-00 P62-0277 

43 SCREW, slotted, pan head, .190" -32 x .88" 

long 


O.D., .015" thick 

03610-128-ON P62-0178 

53029-064-00 P62-0408 

47 SUPPORT 54385-031-01 P62-0418 

48 SCREW, .190-32 x .38" Long, pan head 03610-112-ON P65-0200 

49 SCREW, .164-32 x .44" long, fillister head 03408-014-ON P62-0436 

60 COIL (specify drawing no. of relay where 

part is used) 

62 SPRING (specify drawing no. of relay where 

part is used) 

63 CONTACT GROUP (specify drawing no. of 




64 WASHER, Copper (specify drawing no. of 


65 SLUG, Copper (specify drawing no. of relay 




56015 KN N/A 

00586 KN N/A 

56012 KN N/A 

03306-120-ON P62-0200 

01225 KN N/A 

54960 KN N/A 

55085-208-00 P62-0432 


Parts Catalog 

7.10. B2 AC VANE RELAY, 2F-2B, TWO POSITION 

A 

14 (BLACK) (BLACK) 64 

13 (GRAY) (GRAY) 63 

12 (WHITE) (WHITE) 62 

11 (RED) (RED) 61 

VIEW SHOWING PARTS 

MOUNTED ON SCREW (REF.18) 

Figure 7–8. B2 AC Vane Relay, 2F-2B, Two Position 


Parts Catalog 

Table 7–7. B2 Vane Relay, 2F-2B, Two Position Part Numbers 


2 WASHER, .266 ID, .625 OD, .010 Thk Flat 01148-005-00 P62-0152 

3 CLIP, Locking 18547-080-00 P62-0246 

4 SCREW, .086-56 x .25 Lg Pan Hd 03602-008-ON N/A 

5 WASHER, .086 ID, .200 OD, .015 Thk 

Shk'prf 

53029-064-00 P62-0408 

6 NUT, .375-32 For Cover 56026-004-00 P62-0812 

10 FORM, for test data 51553-036-00 P62-0382 

12 SEAL, Plastic 35285-001-00 N/A 

14 NUT, .375-32 x .19 Thk Sq 42835-011-00 P62-0322 

15 BEARING COMP, Jewel 51527-001-03 N/A 

16 NUT, .313-32 x .13 Thk Hex 12578-002-00 P62-0222 

17 STOP 56563-003-00 P62-0597 

18 SCREW, .250-28 x 4.13 Lg Fill Hd 55470-019-00 P62-0447 

19 SPACER 49655-214-00 P62-0352 

20 NUT, .250-28 x .16 Thk Hex 01472-008-00 P62-0166 

21 BASE COMP 56013-014-01 P62-0505 

23 COVER COMP (W/Holder Assembled) 57287-002-12 N/A 

27 PIN, Bearing .091 x .750 Lg 00504-388-00 P62-0126 

31 PLATE, Name 00401-955-00 P62-0117 

34 NUT, .375-32 x .13 Thk Spanner 00846-028-00 P62-0143 

40 SPACER 49655-215-00 P62-0353 

41 WASHER, .254 ID, .687 OD, .036 Thk Flat 01148-006-00 P62-0698 

44 SHOCK INDICATOR 29006-004-00 N/A 

-- CARTON, SG 381-1 65191-014-05 N/A 

-- Z-PAD, SG 381-2 65191-015-05 N/A 

-- INSERT, SG 323-3 65191-054-05 N/A 

45 SCREW, .164-32 x 1.50 Lg, Pan Hd 03608-048-ON N/A 

46 WASHER, Stainless Steel 53029-068-00 P62-0402 

49 NUT, 10-32 x .125 Thk, Hex 00577-002-00 P62-0127 

49 NUT, 10-32 x .125 Thk, Hex 01272-007-ON P76-0129 

50 WIRE (Per 82J0004) 80599-003-01 N/A 


Parts Catalog 

Table 7–7. B2 Vane Relay, 2F-2B, Two Position Part Numbers (Cont.) 


THE FOLLOWING PARTS ARE TO BE SPECIFIED ON ORDERING SHEETS WHEN 

REQUIRED 

22 VANE COMP 51507 KN N/A 

28 MAGNET COMP. (Local) 51508 KN N/A 

29 MAGNET COMP. (Track) 51508 KN N/A 

35 REGISTRATION PLATE ASSEM. 58879 KN N/A 

36 CONTACT GROUP SPACE #1-6 56012 KN N/A 

37 GASKET GROUP 57108 KN N/A 


Parts Catalog 

7.11. B2 AC VANE RELAY, 4F-4B, TWO POSITION 

A 

14 (BLACK) (BLACK) 64 

13 (GRAY) (GRAY) 63 

12 (WHITE) (WHITE) 62 

11 (RED) (RED) 61 

VIEW SHOWING PARTS 

MOUNTED ON SCREW (REF. 18) 

Figure 7–9. B2 AC Vane Relay, 4F-4B, Two Position 


Parts Catalog 

Table 7–8. B2 Vane Relay, 4F-4B, Two Position Part Numbers 


2 WASHER, .266" I.D., .625" O.D., .010" 01148-005-00 P62-0152 

thick, flat 

3 CLIP, locking 18547-080-00 P62-0246 

4 SCREW, .086" -56 x .25" long, slotted pan 

head 


O.D., .015" thick 

03602-008-ON 

N/A 

53029-064-00 P62-0408 



12 SEAL, tamper evident seal 35285-000-00 P62-0299 

14 NUT, .375-32" x .19" thick, sq 42835-011-00 P62-0332 

15 JEWEL BEARING, for shaft 51527-001-03 N/A 

16 NUT, for bearing, .313" -32 x .13" thick, hex 12578-002-00 P62-0222 

17 STOP, resilient, for vane 56563-003-00 P62-0597 

18 SCREW, for stop, .250" –28 x 4.13" long, 


55470-019-00 P62-0447 

19 SPACER 49655-214-00 P62-0352 

20 NUT, .250-28" x .16" thick, hex 01472-008-00 P62-0166 

21 BASE, includes tubes for studs 56013-014-01 P62-0505 

22 VANE , complete (for relays with 2F-2B 

contacts) 

22 VANE, complete (for relays with 4F-4B 

contacts) 

51507-013-02 P62-0374 

51507-013-03 N/A 

23 COVER, with holder assembled 57287-002-12 N/A 

27 PIN, BEARING, .091" x .750" long 00504-388-00 N/A 

28 MAGNET COMP. (Local) (specify drawing 

no. of relay where part is used) 

29 MAGNET COMP. (Track) (specify drawing 

no. of relay where part is used) 

51508 KN N/A 

51508 KN N/A 

31 NAME PLATE 00401-955-00 P62-0117 

34 NUT, spanner, .375" -32 x .13" thick 00846-028-00 P62-0143 

36 CONTACT GROUP, 1F (AgC-S) – 1B 

(S-S) (specify quantity required) 

56012-108-11 P62-0493 


Parts Catalog 

Table 7–8. B2 Vane Relay, 4F-4B, Two Position Part Numbers (Cont.) 




03306-120-ON P62-0200 

37 CONTACT GROUP, blank 56012-046-01 P62-0700 

38 CONTACT GROUP, (with solder tabs) 56012-038-01 P62-0699 

40 SPACER, for stop 49655-215-00 P62-0353 

41 WASHER, flat, .254" I.D., .687" O.D., .036" 

thick 

01148-006-00 P62-0698 

44 SHOCK INDICATOR 29006-004-00 N/A 

45 SCREW, .164"-32 x 1.50" long, slotted pan 

head 

46 WASHER, internal tooth lock, for a .190-32" 

.164" screw 

03608-048-ON 

N/A 

53029-068-00 P62-0402 

49 NUT, .190" -32 x. 13" thick 01272-007-ON P76-0129 

39 GASKET (for right hand three contact 

groups- rear view) 

50 GASKET (for left hand three contact 

groups- rear view) 

13014-280-00 P62-0229 

13014-279-00 P62-0228 

51 GASKET (for base) 13014-222-00 P62-0226 

52 GASKET (for cover – two required per 

relay) 

30646-012-00 P62-0277 


Parts Catalog 

7.12. B2 CODE RATE TRANSMITTER RELAY 

ALS 

D1 

Figure 7–10. B2 Code Rate Transmitter Relay 


Parts Catalog 

Figure 7–10. B2 Code Rate Transmitter Relay (Cont.) 


Parts Catalog 

Table 7–9. B2 Code Rate Transmitter Relay Part Numbers 


A BASE, includes tubes for studs 56013-026-01 P62-0513 

B CONTACT GROUP, coil, IF contact (silverplatinum) 

57016-013-01 P62-0599 

C CONTACT GROUP, 2F and 2B, (silverplatinum) 

57016-013-02 P62-0600 

C1 CONTACT GROUP, 2F and 2B, (tungsten) 57016-013-03 P62-0601 

D CONTACT GROUP, 2FB contacts (silverplatinum) 

57016-013-04 P62-0602 

D1 SCREW, for attaching contact groups, .138" 03306-120-ON P62-0200 


E ROTOR, COMPLETE, 75 rate 57094-009-01 P62-0612 

E1 ROTOR, COMPLETE, 120 rate 57094-009-02 P62-0613 

E2 ROTOR, COMPLETE, 180 rate 57094-009-03 P62-0614 

E3 ROTOR, COMPLETE, 50 rate 57094-009-06 N/A 




G CONTACT GROUP, with soldering lugs 56012-028-01 P62-0491 

H CAPACITOR, COMPLETE, arc suppression 56644-001-03 P62-0598 

J RESISTOR MOUNTING BLOCK 57277-001-02 P62-0636 

1 TERMINAL WIRE 55083-012-00 P62-0431 

2 SLEEVING, 5mm dia. x 1.25" long 55557-000-00 P62-0450 

3 SCREW, for mounting contact blocks, .138" 23308-008-00 P62-0265 

-40 x 2.0" long 

3A SCREW, for mounting contact blocks, .138" 23308-005-00 P62-0264 

-40 x 1.625" long 

3B NUT, for screws (Ref. 3, 3A), .138" -40 x 03614-007-00 P62-0183 


3C LOCK WASHER, for nut (Ref. 3B) 01601-037-00 P62-0170 

4 FRAME 57491-001-00 P62-0651 


Parts Catalog 

Table 7–9. B2 Code Rate Transmitter Relay Part Numbers (Cont.) 


6 NAME PLATE 00401-956-00 P62-0112 

6A SCREW, for nameplate, .138" -40 x .25" 03406-108-ON P62-0189 

long, slotted, fillister head 

6B LOCK WASHER, internal tooth, .141" I.D., 53029-067-00 P62-0406 

.295" O.D., .021" thick 

7 COVER 57287-002-11 P62-0643 

8 COVER, for bearing 18575-000-00 P62-0248 

8A SCREW, slotted, flat head, .138" -40 x .375" 03306-112-ON P62-0104 

9 UPPER CAM 58728-001-02 P62-0850 

10 LOWER CAM 58728-001-01 P62-0849 


12 POLE, right-hand 57091-001-00 P62-0605 

12B POLE, left-hand 57091-002-00 P62-0606 

13 SCREW, .164" -32 x .50" long, slotted, flat 

head 

14 SCREW, for fastening pole to frame, .250" - 

28 x .50" long, fillister head 

15 SCREW, headless, for mounting contact 

blocks, .138" -40 x 1.188" long 


O.D., .021" thick 

15B WASHER, flat, .172" I.D., .375" O.D., .031" 

thick 

16 SCREW, for attaching Ref. 12 and 12A, 

.190" -32 x .75" long, slotted fillister head 

16A LOCK WASHER, internal tooth, .195" I.D., 

.381" O.D., .025" thick 

03308-016-ON P62-0297 

55370-001-00 P62-0835 

23308-004-00 P62-0263 

53029-067-00 P62-0406 

01250-006-ON P62-0696 

03410-124-ON P65-0208 

53029-069-00 P62-0401 

17 COIL, 150.0 ohm 31066-135-01 P62-0286 

18 RESISTOR, 150.0 ohm 59723-124-00 P62-0685 

19 SCREW, for attaching Ref. 20, .190" -32 x 

.50" long, slotted, fillister head 

03410-116-ON P62-0214 

20 BRACKET, frame 54297-003-00 P62-0416 

21 RESISTOR, 1000 ohm, used in multiple 

with coil, for arc suppression 

59723-000-00 P62-0714 


Parts Catalog 



22 SCREW, .190" -32 x .63" long, slotted, flat 03310-120-ON P50-0431 

head 

23 NUT, .190" -32 x. 13" thick 01272-007-ON P76-0129 

24 STOP 17185-000-00 P62-0237 

25 BUSHING 07350-261-00 P62-0209 

26 PUSHER, for Contact Group (Ref. C) 57019-000-00 P62-0716 

27 PUSHER, for Contact Group (Ref. D) 57019-003-00 P62-0717 

28 BUSHING, for Contact Groups 07350-275-00 P62-0210 

30 UPPER BEARING 57092-009-01 P62-0609 

31 UPPER CLAMPING PLATE, for ribbon 55911-036-00 P62-0469 

32 SHIM WASHER, .222" I.D., .417" O.D., 

.050" thick 

33 SHIM WASHER, .222" I.D., .417" O.D., 

.005" thick 

33A SHIM WASHER, .222" I.D., .417" O.D., 

.008" thick 

00975-007-00 P62-0715 

00975-005-00 P62-0146 

00975-006-00 P62-0147 

34 GUIDE, for spring 18559-000-00 P62-0247 

35 SPRING, for upper bearing 51055-008-00 P62-0359 

36 WASHER, .297" I.D., .432" O.D., .020" thick 01225-199-00 P62-0164 

37 RIBBON, COMPLETE 22148-000-02 P62-0256 

38 NUT, for locking cams in place, .313" -32 x 


12578-002-00 P62-0221 

39 ROTOR, with shaft, hub and roll-pin 57094-010-01 P62-0603 

40 SCREW, .190" -32 x .375" long, slotted, 


40A LOCK WASHER, internal tooth, .190" I.D., 

.381" O.D., .025" thick 

03410-112-ON P62-0218 

53029-069-00 P62-0401 

42 ROLL PIN 17188-000-00 P62-0238 

43 SPRING, for rotor 34956-004-00 P62-0295 

44 CUP WASHER, for nut 22539-008-00 P62-0257 

45 NUT, for holding spring on rotor, .50" -32 x 


06358-011-00 P62-0205 

46 LOWER BEARING 57092-008-01 P62-0608 

47 CLAMP 54847-011-00 P62-0423 


Parts Catalog 



48 SCREW, .190" -32 x .50" long, slotted 03310-116-ON P62-0176 


49 NUT, for lower bearing 39549-013-00 P62-0316 

50 LOWER CLAMPING PLATE, for ribbon 55911-035-00 P62-0468 

51 WEIGHT RING, .063" thick, nine required 

for 50 rate transmitters; eight required for 75 

rate transmitters ; three required for 96 rate 

transmitters 

51A WEIGHT RING, .031 " thick, one required 

for 75 rate; four required for 120 rate ; one 

required for 96 rate transmitters 

52 SCREW, .190" -32 x .88" long, slotted, 


43712-008-00 P62-0336 

43712-011-00 P62-0338 

03410-128-ON P62-0217 

52A NUT, .190" -32 x. 13" thick, hex 01272-007-ON P62-0129 

52B FLAT WASHER, .438" O.D., .200" I.D., .03" 

thick 

52C LOCK WASHER, internal tooth, .190" I.D., 

.381" O.D., .025" thick 

01250-009-ON P76-0247 

53029-069-00 P62-0401 

53 ARMATURE 57110-000-00 P62-0625 

54 BASE RING, one required for 50, 75, 96, 

120 and 180 rate transmitters 

55 STUD, for fastening stationary end of spring 

to arm 

43712-009-00 P62-0337 

20247-004-00 P62-0254 

56 STOP, for fastening end of spring on stud 38316-002-00 P62-0308 

57 ARM, for stud and stop 54818-014-00 P62-0422 

58 NUT, jam .250" -28 x .156" thick, hex 01472-007-00 P62-0165 


76 NUT, cover 56026-011-00 P62-0578 

76A GASKET, cover 30646-012-00 P62-0277 

77 SHIELD, for contact groups 50737-091-00 P62-0227 


Parts Catalog 

7.13. B2 MICROCHRON II TIMER RELAY (DC) 

28-29 

104 

102 

103 

105 

111 

108 

109 

110 

18 

108 

109 

110 

19 

20 

25 22 8 

30 

116 

106-107 

VIEW SHOWN WITH COVER (REF.13) 

SWITCH BOARD (REF.103) AND 

BRACKET (REF.105) REMOVED 

6 

13 

4 5 

7 

9 35 36 113-114 

1 

16 

23 

0 1 2 3 15 

33 

32 

11 

21 

31 

24 

27 

26 

112 34 

Fig. 1 

12 

3 2 

115 

10 

13A 

34 

Fig. 2 

Figure 7–11. B2 Microchron II Timer Relay (DC) 


Parts Catalog 

FRONT VIEW 

1 2 3 4 5 6 

NEUTRAL B2 TIMER 

2FB 

3F 

2B 

ARMATURE AIR GAP 

FRONT CONTACT OPENING 

REGISTERED IN SPACES 

(AgC-S, S-S) 

(AgC-S) 

(S-AgC) 

.010in. min. 

.050in (MIN.) 

1-4-6-11 

+ 

- 

Microchron II Timer Relay Contact Groups 

REQ EACH RELAY 

REQUIRES 

COIL 

REFERENCE 

CATALOG NO. 

CONTACT GROUP 56015-074-01 (2) A62-691 or 

A62-744 

SPACE 1 

SPACE 2 

SPACE 3 

ORDERING 

REFERENCE 

50800-101-01 or 

50800-101-02 

1 SPACE 4 56012-108-32 

1 SPACE 5 56012-108-39 

1 SPACE 6 56012-108-06 

Figure 7–11. B2 Microchron II Timer Relay (DC) (Cont.) 

NOTE 

The only difference between the 50800-101-01 (tinted seal) and 50800- 

101-02 (lead seal) relays is that 50800-101-02 has alternate sealing for 

time setting thumbwheel switches. 


Parts Catalog 

Table 7–10. B2 Microchron II Timer Relay Part Numbers 


1 BASE COMPLETE 56013-019-11 P62-0840 

2 COIL COMPLETE 56015-074-01 N/A 


4 ARMATURE COMPLETE 39043-022-01 P62-0312 

5 PLATE, Armature Bearing 55912-001-00 P62-0470 

6 PLATE, Armature Retaining 55914-001-00 P62-0473 

7 NUT, .190-32 x .187 thick, round lock 00846-023-00 P62-0142 

8 NUT, Lock 56024-000-00 P62-0575 

9 SPRING 00586-095-00 P62-0131 

10 YOKE 01224-038-00 N/A 

11 PLATE, Name 00401-925-00 N/A 

12 WASHER, .653" I.D., 1.391" O.D., .022" 

thick, spring 

01225-104-00 P62-0158 

13 COVER 56029-104-00 P62-0819 

13A COVER COMPLETE 57287-012-01 N/A 

14 CONNECTOR, Splice 00958-009-ON N/A 

15 HOLDER, Card 50023-039-00 P62-0356 

16 FORM 51553-089-00 N/A 

18 CONTACT GROUP 56012-108-32 P62-0792 



21 SCREW, .112” -40 x .19” long pan head , 

with patch 


with patch 


Self Tap 

24 SCREW, for attaching contact groups, 

.138” -40 x .63” long flat head 


with patch 

02430-038-00 P62-0442 

02430-037-00 N/A 

06604-212-ON P62-0594 

03306-120-ON P62-0200 

02430-036-00 N/A 


Parts Catalog 

Table 7–10. B2 Microchron II Timer Relay (DC) Part Numbers (Cont.) 


26 SCREW, .313” -24 x 1.00” long, hex head, 53141-025-00 P62-0845 

SEMS 

27 NUT, .164” -32 x .229” thick, elastic stop 42333-046-00 N/A 

28 RECEPTACLE (4 Pos) Mate-N-Lock (P1) 58920-483-00 N/A 

29 TERMINAL, Pin (#20-14 AWG) 55871-161-00 N/A 

30 GASKET, (Base) 13014-222-00 P62-0226 

31 SHIELD, Dust 50737-091-00 P62-0227 

32 GASKET 30646-012-00 P62-0277 

33 NUT, .375” -32 x .28” thick, special 56026-004-00 P62-0812 

34 SEAL 35285-000-00 P62-0299 

35 WIRE, #20 AWG Tefzel White, (Per 

82A0006) 

36 WIRE, #20 AWG Tefzel Black, (Per 

82A0006) 

80559-063-01 N/A 

80559-066-01 N/A 

102 BOARD ASSEMBLY (Mother) 31166-132-01 P62-0842 

103 BOARD ASSEMBLY (Switch) 31166-137-01 P62-0841 

104 BRACKET 54844-462-00 N/A 

105 BRACKET 54844-463-00 N/A 

106 SCREW, .138” -32 x .38” long pan head 03606-012-ON P50-0473 

107 WASHER, .138” I.D., .250” O.D., .031” 

thick, lock 

01273-002-ON P73-0275 

108 SCREW, .112” -40 x .25” long pan head 03604-008-ON P62-0759 

109 WASHER, .112” I.D., .270” O.D., .019” 

thick, shk’prf 

110 WASHER, .112” I.D., .375” O.D., .40” thick, 

flat 

53029-066-00 P65-0730 

01250-031-ON 

111 RIVET, Snap 34496-062-00 N/A 

112 TAMPER EVIDENT SEAL, red tint 37947-058-00 N/A 

112 TAMPER EVIDENT SEAL, green tint 37947-059-00 N/A 

113 TERMINAL 55083-012-00 P62-0431 

114 SLEEVE, insulating 55557-000-00 P62-0450 

115 TIE, cable 01232-001-ON P85-1222 

N/A 


Parts Catalog 

Table 7–10. B2 Microchron II Timer Relay (DC) Part Numbers (Cont.) 


116 TUBING, .125 shrink blk (Per 82P0004) 81411-019-01 N/A 

TAG, instruction (For 50800-101-01 Relay) 55085-720-00 N/A 

TAG, instruction (For 50800-101-02 Relay) 55085-728-00 N/A 


Parts Catalog 

7.14. B2 AC MICROCHRON II TIMER RELAY 

25 22 8 

101 

30 

18 

102 108-109-119 

(J1) 

19 

18 

118 

119 

(J1) 

(P1) 

(P1) 

(P2) 

20 

(P2) 

106 

107 

37-38 

120 

36 

113-114 

1 

9 

104 

7 5 4 6 

(P2) 

31 

31 

33 

1 

35 

24 

32 

(J1) 

34 

(P1) 

4 

3 

2 

1 

35 

26 

11 

21 

41 

13 36 28-29 

116 

27 

10 

115 

2-14 3 12-40 

16 

108 

109 

119 

1 2 3 4 

5 

103 

111 

23 

15 

DS3-PWR/TIMING 

DS4-DELAY COMPLETE 

1 2 4 5 

105 

34 

Figure 7–12. B2 AC Microchron II Timer Relay 


Parts Catalog 

Table 7–11. B2 AC Microchron II Timer Relay Part Numbers 


1 BASE COMPLETE 56013-019-14 N/A 

2 COIL COMPLETE 56015-074-01 N/A 


4 ARMATURE COMP 39043-022-01 P62-0312 

5 PLATE, Armature Bearing 55912-001-00 P62-0470 

6 PLATE, Armature Retaining 55914-001-00 P62-0473 

7 NUT, .190-32 x .187" thick, round lock 00846-023-00 P62-0142 

8 NUT, Lock 56024-000-00 P62-0575 

9 SPRING 00586-095-00 P62-0131 

10 YOKE 01224-037-00 P62-0824 

11 PLATE, Name 00401-925-00 N/A 

12 WASHER, .653" I.D., 1.391" O.D., .022" 

thick, spring 

01225-104-00 P62-0158 

13 COVER COMPLETE 57287-013-01 N/A 

14 CONNECTOR, Splice 00958-009-ON N/A 

15 HOLDER, Card 50023-039-00 P62-0356 

18 CONTACT GROUP, Space 1, 3 56012-108-02 P62-0479 

19 CONTACT GROUP, Space 2 56012-108-06 P62-0484 

20 CONTACT GROUP, Space 4, 5, 6 56012-050-01 N/A 

21 SCREW, .112" -40 x .19" long pan head 

Nylock 

22 SCREW, .112" -40 x .25" long pan head 

SEMS 

23 SCREW, .112" -40 x .38" long pan head, 

self tap 

24 SCREW, for attaching contact groups, 

.138" -40 x .63" long, flat head 

25 SCREW, .164" -32 x .31" long, pan head 

SEMS 

26 SCREW, .313" -24 x 1.00" long, hex head 

SEMS 

02430-038-00 P62-0442 

53141-027-00 P62-0844 

06604-212-ON P62-0594 

03306-120-ON P62-0200 

53141-026-00 P62-0845 

53141-025-00 P62-0846 

27 NUT, .164" -32 x .229" thick, elastic stop 42333-046-00 N/A 

28 RECEPTACLE (4 Pos) Mate-N-Lok (P1) 58920-483-00 N/A 


Parts Catalog 

Table 7–11. B2 AC Microchron II Timer Relay Part Numbers (Cont.) 


29 TERMINAL, Pin (#20-14 AWG) 55871-161-00 N/A 

30 GASKET, (Base) 13014-222-00 P62-0226 

31 SHIELD, Dust 50737-091-00 P62-0227 

32 GASKET 30646-012-00 P62-0277 

33 NUT, .375 -32 x .28 thick, special 56026-004-00 P62-0812 

34 SEAL 35285-000-00 P62-0299 

35 WIRE, #18 AWG Tefzel white (per 

82A0006) 

36 WIRE, #18 AWG Tefzel black (per 

82A0006) 

80559-108-01 N/A 

80559-065-01 N/A 

37 TERMINAL, Socket (#22-18 AWG) (for P2) 59825-248-00 N/A 

38 RECEPTACLE (4 pos), Mini Mate-N-Lock 

(P2) 

58920-513-00 N/A 

39 WIRE, #18 AWG (Per 82J0002) 80598-001-01 N/A 

40 WASHER, .578" I.D., 1.375" O.D., .031" 

thick, fiber 

34017-114-00 N/A 

41 HEAD 54863-002-00 N/A 

16 FORM for 50800-103-01 51553-104-00 N/A 

16 FORM for 50800-104-01 51553-105-00 N/A 

102 BOARD ASSEMBLY (Timer Processor) for 

50800-103-01 

102 BOARD ASSEMBLY (Timer Processor) for 

50800-104-01 

103 BOARD ASSEMBLY (Thumbwheel Switch) 

for 50800-103-01 

103 BOARD ASSEMBLY (Thumbwheel Switch) 

for 50800-104-01 

31166-299-01 N/A 

31166-299-02 N/A 

31166-300-01 N/A 

31166-353-01 N/A 

104 BRACKET, Board 54844-487-00 N/A 

105 BRACKET, Switch 54844-505-00 N/A 

106 SCREW, .138-32 x .38" long, pan head 03606-012-ON P50-0473 

107 WASHER, .138 ID", .250" O.D., .031" thick, 

lock 

01273-002-ON P73-0175 

108 SCREW, .112-40 x .25" long, pan head 03604-008-ON P62-0759 


Parts Catalog 

Table 7–11. B2 AC Microchron II Timer Relay Part Numbers (Cont.) 


109 WASHER, .112" I.D., .270" O.D., .019" 53029-066-00 P65-0730 

thick, shk’prf 

111 RIVET, Snap 34496-062-00 N/A 

112 INDICATOR, Shock 29006-004-00 N/A 

113 TERMINAL 55083-012-00 P62-0431 

114 SLEEVE, Insulating 55557-000-00 P62-0450 

115 TIE, Cable 01232-001-ON P85-1222 

116 TUBING, .125" Shrink, black (per 82P0004) 81411-019-01 N/A 

117 TAG, Instruction 55085-732-00 N/A 

118 NUT, .112-40 x .143" thick, hex elastic stop 42333-045-00 N/A 

119 WASHER, .112" I.D., .375" O.D., .040" 

thick, flat 

01250-031-ON 

120 TIE, Cable 01232-000-ON N/A 

N/A 


Parts Catalog 

7.15. TYPE VTB POLAR-BIASED RELAY 

Figure 7–13. Type VTB Polar-Biased Relay 


Parts Catalog 

Table 7–12. VTB Polar Biased Relay Part Numbers 


A CONTACT GROUP, three dependent front 56012-109-04 P62-0499 

and back silver-platinum contacts 

B 

B1 

B2 

C 

CONTACT GROUP, one dependent front 

back, two dependent fronts and one 

dependent back silver-platinum contacts 

CONTACT GROUP, except with one 

dependent front back, one dependent front, 

one dependent back silver-platinum 

contacts 

CONTACT GROUP, except with one 

dependent front back silver-platinum, one 

dependent back silver-platinum, one 

dependent front tungsten, one dependent 

back tungsten. 

CONTACT GROUP, two dependent front 

and back silver-platinum contacts 

56012-109-02 P62-0497 

56012-109-05 P62-0760 

56012-109-06 P62-0836 

56012-109-03 P62-0498 

1 GASKET, for cover 13014-312-00 P62-0230 

2 BASE, for relay 56023-034-00 P62-0574 

3 SCREW, .112"-40 x .25" slotted pan head 03604-008-ON P62-0759 

3A WASHER, .115" I.D., .270" O.D., .019" 

thick, internal tooth lock 

53029-066-00 P65-0730 

4 TERMINAL 55083-012-00 P62-0431 

5 SCREW, .164"-32 x .88" long. slotted pan 

head 

03608-028-ON P30-0447 

5A NUT, .164"-32 x .13" thick, hex 03891-011-00 P62-0186 

5B WASHER, .168" I.D., .340" O.D., .023" 

thick., internal tooth lock 

53029-068-00 P62-0402 

6 CONTACT GROUP, for coil connections 56012-060-01 P62-0496 

7 SLEEVING, for coil connections 55557-000-00 P62-0450 

8 PUSHER, for contact groups, has slot in 

back for right-hand contact group on double 

armature relays 

8A 

PUSHER, has slot in front edge, for single 

armature relays and for left-hand contact 

group on double armature relays 

55863-053-00 P62-0465 

55863-052-00 P62-0464 


Parts Catalog 

Table 7–12. VTB Polar Biased Relay Part Numbers (Cont.) 


8B CLIP, two required per contact group (USE 56025-001-00 P62-0577 

ONLY ONCE) 

9 COVER, for relay 56029-031-00 P62-0581 

10 BUSHING, for tube 45896-029-00 P62-0754 

12 SPACER 50514-012-00 P62-0755 

13 BRACKET COMPLETE 18470-001-01 P62-0746 

14 SCREW, .138" - 32 x .31" long., slotted pan 

head 

03606-010-ON P85-0464 

14A NUT, .138" - 32 x. 25" thick, hex 01272-010-ON P65-0498 

14B WASHER, .141" I.D., .295" O.D., .021" 


15 SCREW, .190" - 32 x .75" long., slotted pan 

head 

16 BLOCK, for cores, for double-armature 

relays 

53029-081-00 P62-0837 

03610-124-ON P65-0208 

53336-012-00 P62-0758 

17 YOKE, for cores 01224-034-00 P62-0740 

18 FRAME, only 18476-000-00 P62-0748 

19 TUBE, for fastening relay to plugboard 29474-047-00 P62-0270 

20 SEAL 35285-000-00 P62-0299 

21 HANDLE, for relay 41909-022-00 P62-0319 



53007-060-00 P62-0838 

23 NUT, .190" - 32 x .13" thick x .38" hex 01272-007-ON P76-0129 

24 SCREW, .164" - 32 x .63" long, crowned 

head 

07499-002-00 P62-0211 

24A NUT, .164" - 32 x .13" thick, hex 03891-011-00 P62-0186 

24B WASHER, .168" I.D., .340" O.D., .023" thick 53029-068-00 P62-0402 

25 CORE, for double armature relay 29514-173-00 P62-0750 

25A CORE, for single-armature relay 29514-172-00 P62-0749 

26 SPRING, pressure, for coils 13108-030-00 P62-0233 

27 HOLDER, for test data form 50023-039-00 P62-0356 


Parts Catalog 



28 FORM, test data 51553-095-00 P62-0839 

29 SCREW, .112" - 40 x .3" long, slotted pan 

head self tapping 

56190-003-00 P62-0593 

30 COIL, right or left hand, 0.10 ohms 59857-004-05 P62-0687 

30A COIL, right or left hand, 0.12 ohms 59857-004-04 P62-0686 

30B COIL, right or left hand, 2.0 ohms 59857-004-09 P62-0764 

30C COIL, right or left hand, 4.0 ohms 59857-004-06 P62-0763 

30D COIL, right or left hand, 17.0 ohms 59857-005-06 P62-0688 

30E COIL, right or left hand, 100.0 ohms 59857-005-07 P62-0689 

31 SCREW, for block and yoke, .190"-32 x 13006-063-00 P62-0743 

1.88" long, hex 

31A NUT, .190"-32 x .13" thick x .38" hex 01272-007-ON P76-0129 

31B WASHER, internal tooth shakeproof washer 

for a .190" screw 

53029-069-00 P62-0401 

32 BRACKET, left-hand 18470-000-01 P62-0744 

33 PLATE, clamping 18475-000-00 P62-0747 

34 SCREW, .112"-40 x .25" long slotted fillister 

head 

03404-008-ON P62-0445 

34A NUT, .112"-40 x .25" hex x .09" thick 01272-002-ON P62-0765 

34B WASHER, .115" I.D., .270" O.D., .019" 


35 SCREW, .164"-32 x .75" long, slotted pan 

head 

35A WASHER, .168" I.D., .340" O.D., .023" 


36 SCREW, .138"-40 x .25" long. slotted pan 

head 

53029-066-00 P65-0730 

03608-024-ON P62-0175 

03610-124-ON P65-0208 

03606-108-ON P62-0753 

37 NAME PLATE 00401-309-00 P62-0015 

38 SCREW, for supporting magnet, .190"-32 x 

1.38" long. fillister head 

38A NUT, .190" -32 x .385" x .38" Sq. x .13" 

thick 

38B WASHER, .190" I.D., .381" O.D., .025" 

internal tooth lock washer 

12563-020-00 P62-0742 

31784-001-00 P62-0751 

53029-069-00 P62-0401 


Parts Catalog 



39 BRACKET, right-hand 18470-000-02 P62-0745 

40 ARMATURE COMPLETE 18472-001-01 P62-0245 

41 SLEEVE, molded rubber, used with #10 

AWG wire on plugboards 

42 TERMINAL, solder-type, two required per 

insulator 

35189-033-00 P62-0298 

55871-019-00 P62-0466 

44 NUT, .250" -28 hex 01472-003-00 P62-0167 

45 WASHER, spring lock for a .250" screw 01273-006-ON P81-0121 

46 WASHER, flat for a .250" screw 01250-029-ON P85-0050 

47 SCREW, .250" -28 x 1.25" slotted fillister 

head 

55470-004-00 P62-0448 

48 INSULATOR, for plugboard 55862-024-00 P62-0457 

49 STUD, for plugboard 48813-007-00 P62-0347 

49A NUT, .250" -28 hex, elastic stop 42333-065-00 P62-0320 

49B WASHER, flat washer for a .250" screw 01250-011-ON P50-0157 

50 SCREW, .164" -32 x .375", slotted fillister 

head 

50A WASHER, .168", 340" O.D., .023" thick, 

internal tooth shakeproof 

03408-012-ON P85-0870 

53029-068-00 P62-0402 

51 NUT, for current test posts .242" -24 00578-015-00 P62-0129 

52 CONNECTOR, for current test posts 04906-150-00 P62-0191 

53 SCREW, .164" -32 x .88" long. fillister head 

for fastening registration plate to relay 

54 SCREW, used as current test post, .242" - 

24 x 3.75" long 

55 SCREW, used a voltage test post, .242" -24 

x 3.38" long 

28989-046-00 P62-0268 

00374-010-00 P62-0108 

00376-013-00 P62-0109 

56 NUT, for fastening relay to plugboard 00846-029-00 P62-0144 

57 NUT, for locking nut (Ref. 56) 01472-008-00 P62-0166 

58 NUT, for lest posts, .242" -24 x .313" thick 42843-001-00 P76-0131 

59 WASHER, for test posts 01225-002-00 P76-0108 

60 NUT, .242" -24 x.188" thick 42839-005-00 P62-0333 

61 BUSHING, insulating, for connectors 06347-031-00 P62-0203 



Nominal Res. 

Ohms 

Table 7–13. B Relay Coil and Compression Spring Part Numbers 

Coil Used For Relay Coil Compression Spring 

Top or 

Bottom 

Used with 

Catalog No. 

Drawing No. Catalog No. Drawing No. Catalog No. 

105 Either A62-205 56015-023-01 P62-547 00586-095-00 P62-131 

0.12 Either A62-211 56015-022-07 P62-543 00586-095-00 P62-131 

0.2 Either A62-213 56015-022-06 P62-542 00586-095-00 P62-131 

450 Top A62-215 56015-008-15 P62-519 00586-095-00 P62-131 

0.45 Bottom A62-215 56015-022-05 P62-541 00586-095-00 P62-131 

450 Top A62-217 56015-008-15 P62-519 00586-095-00 P62-131 

0.069 Bottom A62-217 56015-056-01 P62-563 00586-095-00 P62-131 

450 Top A62-221 56015-008-15 P62-519 00586-095-00 P62-131 

0.12 Bottom A62-221 56015-022-07 P62-543 00586-095-00 P62-131 

450 Top A62-231 56015-008-15 P62-519 00586-095-00 P62-131 

0.2 Bottom A62-231 56015-022-06 P62-542 00586-095-00 P62-131 

450 Top A62-236 56015-008-15 P62-519 00586-095-00 P62-131 

0.61 Bottom A62-236 56015-022-01 P62-545 00586-095-00 P62-131 

0.9 Either A62-260 56015-022-03 P62-540 00586-095-00 P62-131 

2.0 Either A62-261 56015-022-02 P62-539 00586-095-00 P62-131 

250 Either A62-262 56015-008-14 P62-518 00586-095-00 P62-131 

250 Either A62-277 56015-008-14 P62-518 00586-095-00 P62-131 

Parts Catalog


Nominal Res. 

Ohms 

Table 7–13. B Relay Coil and Compression Spring Part Numbers (Cont.) 


Top or 

Bottom 

Used with 

Catalog No. 


3.0 Either A62-293 56015-022-14 P62-546 00586-056-00 P62-130 

42 Either A62-295 56015-009-10 P62-521 00586-095-00 P62-131 

450 Either A62-296 56015-008-14 P62-519 00586-095-00 P62-131 

175 Either A62-300 56015-008-13 P62-517 00586-095-00 P62-131 

42 Either A62-305 56015-009-10 P62-521 00586-095-00 P62-131 

450 Either A62-308 56015-008-15 P62-519 00586-095-00 P62-131 

175 Either A62-309 56015-008-13 P62-517 00586-095-00 P62-131 

250 Either A62-310 56015-008-14 P62-518 00586-095-00 P62-131 

450 Either A62-311 56015-008-15 P62-519 00586-095-00 P62-131 

450 Top A62-312 56015-008-15 P62-519 00586-095-00 P62-131 

8 Bottom A62-312 56015-022-01 P62-733 00586-095-00 P62-131 

42 Top A62-313 56015-009-10 P62-521 00586-095-00 P62-131 

1.6 Bottom A62-313 56015-037-02 P62-552 00586-095-00 P62-131 

4.5 Either A62-314 56015-037-03 P62-553 00586-095-00 P62-131 

29.5 Top A62-315 56015-035-03 P62-551 00586-095-00 P62-131 

20.5 Bottom A62-315 56015-009-08 P62-520 00586-095-00 P62-131 

50 Either A62-317 56015-008-10 P62-515 00586-095-00 P62-131 

900 Either A62-318 56015-009-17 P62-523 00586-095-00 P62-131 

Parts Catalog


Nominal Res. 

Ohms 



Top or 

Bottom 

Used with 

Catalog No. 


900 Either A62-320 56015-009-17 P62-523 00586-095-00 P62-131 

28.5 Top A62-325 56015-022-11 P62-776 00586-095-00 P62-131 

135 Top A62-335 56015-021-04 P62-538 00586-095-00 P62-131 

65 Bottom A62-335 56015-021-03 P62-537 00586-095-00 P62-131 

300 Bottom A62-341 56015-012-16 P62-533 00586-095-00 P62-131 

220 Bottom A62-345 56015-011-15 P62-530 00586-095-00 P62-131 

194 Bottom A62-350 56015-012-15 P62-532 00586-095-00 P62-131 

460 Bottom A62-353 56015-012-17 P62-534 00586-095-00 P62-131 

450 Bottom A62-355 56015-008-15 P62-519 00586-095-00 P62-131 

**194 Bottom A62-357 56015-012-15 P62-532 00586-095-00 P62-131 

194 Bottom A62-358 56015-012-15 P62-532 00586-095-00 P62-131 

**194 Bottom A62-359 56015-012-15 P62-532 00586-095-00 P62-131 

**194 Bottom A62-360 56015-012-15 P62-532 00586-095-00 P62-131 

12 Either A62-365 56015-045-10 P62-691 00586-110-00 P62-133 

300 Bottom A62-369 56015-012-16 P62-533 00586-095-00 P62-131 

800 Bottom A62-370 56015-009-21 P62-525 00586-095-00 P62-131 

400 Bottom A62-372 56015-012-17 P62-534 00586-095-00 P62-130 

** For use with relays containing aluminum slugs. 

Parts Catalog


Nominal Res. 

Ohms 



Top or 

Bottom 

Used with 

Catalog No. 


40 Either A62-380 56015-023-05 P62-548 00586-095-00 P62-131 

50-00 Either A62-401 56015-008-10 P62-515 00586-104-00 P62-132 

100 Either A62-406&407 56015-008-12 P62-516 00586-056-00 P62-130 

1.7 Top A62-410 56015-015-04 P62-536 00586-095-00 P62-131 

2.2 Bottom A62-410 56015-014-03 P62-535 00586-095-00 P62-131 

220 Bottom A62-415 56015-011-15 P62-530 00586-095-00 P62-131 

0.045 Top A62-424 56015-056-03 P62-779 00586-056-00 P62-130 

450 Bottom A62-424 56015-008-15 P62-519 00586-056-00 P62-130 

250 Either A62-427 56015-008-14 P62-518 00586-095-00 P62-131 

250 Either A62-429 56015-041-06 P62-554 00586-110-00 P62-133 

135 Top A62-430&431 56015-011-14 P62-529 00586-056-00 P62-130 

0.064 Bottom A62-430&431 56015-063-01 P62-568 00586-056-00 P62-130 

1225 Top A62-432 56015-029-01 P62-777 00586-056-00 P62-130 

0.068 Bottom A62-432 56015-030-01 P62-778 00586-056-00 P62-130 

220 Top A62-433 56015-011-15 P62-530 00586-169-00 P62-783 

1.85 Bottom A62-433 56015-067-01 P62-781 00586-169-00 P62-783 

40 Either A62-519 31066-101-08 P62-279 00586-138-00 P62-782 

460 Top A62-521 56015-012-17 P62-534 00586-095-00 P62-131 

1.0 Bottom A62-522 56015-065-02 P62-780 00586-138-00 P62-782 

Parts Catalog

Parts Catalog 

7.16. B RELAY CONTACT GROUPS 

1 

A. 2FB 1 B. 2FB 1 D. 1FB 

1 

1 1 

E. 2FB F. 2F-1B G. 2F-1B 

1 

1 

H. 1F-2B J. 1F-2B K. 2B 

2A 

2 

3 3 

M. 1F-1B N. 3B 1 

P. 2F 

3 

3A 

3 3 

1 1 

Q. 1F -1B R. 2B S. 2F 

1 

1A 

T. 2F-1B 

1 

U. 3F V. 3F 

1 

1 

W. 1FB-1F 

Three different pushers are used, each pusher is identified as 1, 2, or 3. 

Three different clips are used, example clips are identified as 1A, 2A, or 3A. These numbers refer to the ref. numbers used in Table 7-14, B Relay 

Group Pusher and Clip Part Numbers. 

See Table 7-13 for contact group combinations and descriptions for the above references A through W. 

Figure 7–14. B Relay Contact Groups 


Parts Catalog 

MARKED END 

OF MAGNET 

MARKED END 

OF MAGNET 

MARKED END 

OF MAGNET 

MARKED END 

OF MAGNET 

MARKED END 

OF MAGNET 

MARKED END 

OF MAGNET 

Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 

Figure 7–15. B Relay Extra Heavy-Duty (EHD) Contact Group Magnet Detail 

Figures 7–14 and 7–15, combined with Tables 7–14 and 7–15, provide contact, pusher 

and clip details for the typical B relay contact group combinations. B2 Code Rate 

Transmitter Relay contact group part numbers are summarized in Table 7–9 and VTB 

relay contact groups are included in Table 7–10. 

• Figure 7–14 shows the contacts groups identified by a reference letter that 

corresponds to Table 7–14’s Ref. column. The illustrations also include a reference 

numbers that correspond to the Ref. column in Table 7–15. 

• Figure 7–15 contains six illustrations of extra heavy-duty (EHD) contact groups 

identified by Fig. numbers corresponding to references in Table 7–14 Combination 

column. 

• Table 7–14 provides drawing and catalog numbers for the various B relay contact 

combinations. 

• Table 7–15 provides the three combinations of contact group pusher and clip part 

numbers used in the B relay combinations. 


Parts Catalog 

Table 7–14. B Relay Contact Group Part Numbers 

Ref. Combination Front Back Contacts Drawing No. Catalog No. 

Contacts 

A 2FB AgC to S (MD) S to S (MD) 56012-108-06 P62-0484 

B 2FB AgC to S (HD) S to S (HD) 56012-108-09 P62-0488 

B 2FB S to S (HD) S to S (HD) 56012-108-08 P62-0487 

B 2FB AgC to S (HD) S to AgC (HD) 56012-108-07 P62-0485 

D 

1FB 

1FB 

S to S (HD) 

AgC to S (MD) 

E 2FB 2 SCdO to SCdO 

(HD) 

S to S (HD) 

S to S (MD) 

SCdO to SCdO 

(HD) 

56012-108-35 P62-0486 

56012-108-40 P62-0500 

F 2F-1B AgC to S (MD) S to S (MD) 56012-108-02 P62-0479 

G 2F-1B AgC to S (HD) S to S (HD) 56012-108-03 P62-0480 

H 1F-2B AgC to S (MD) S to S (MD) 56012-108-05 P62-0482 

J 1F-2B S to S (MD) S to S (MD) 56012-108-34 P62-0483 

K 2B - S to S (HD) 56012-108-25 P62-0495 

M 1 1F-1B (Fig. 1) AgC to S (EHD) S to S (EHD) 56012-108-12 P62-0803 

N 3B - S to S (MD) 56012-108-33 P62-0481 

P 2F S to S (MD) - 56012-108-36 P62-0489 

Q 1 

1F 2 -1B 2 (Fig. 1) SCdO to SCdO 

(EHD) 

SCdO to SCdO 

(EHD) 

56012-108-13 P62-0494 

R 1 2B (Fig. 3) - S to S (EHD) 56012-108-38 P62-0805 

S 1 2F (Fig. 2) AgC to S (EHD) — 56012-108-37 P62-0804 



T 2F-1B AgC to S (HD) S to AgC (HD) 56012-108-04 P62-0847 

U 3F AgC to S (MD) — 56012-108-22 N/A 

V 3F 2 SCdO to SCdO 

(HD) 

1FB-1F 2 (Fig. 6) AgC to S (MD) 

SCdO to SCdO 

(EHD) 

Legend: 

AgC to S = Silver-Impregnated Carbon to Silver 

HD = Heavy-Duty 

EHD = Extra Heavy-Duty, with magnetic blowouts 

W 1 

See the 2 notes on the next page. 

— 56012-108-01 N/A 

S-SMD 56012-108-46 N/A 

S to S = Silver to Silver 

MD = Medium Duty 

SCdO = Silver Cadmium Oxide 


Parts Catalog 

NOTE 1 

When ordering contact groups shown in Table 7–14 Ref. M, Q, R, S or W, 

be sure to identify the drawing number of the relay on which the contact 

group will be used, so magnets can be magnetized and assembled 

correctly. 

NOTE 2 

Be aware that the following references have a minimum current rating of 

0.300 amps for reliable contact operation: 

- reference E, 2FB combination with front-back contacts of SCdO (HD) 

- reference Q, 1F-1B combination with front and back contacts of SCdO to 

SCdO (EHD) 

- reference V, 3F combination with SCdO (HD) contacts 

- reference W, 1F SCdO to SCdO 

Table 7–15. B Relay Contact Group Pusher and Clip Part Numbers 


1 PUSHER, for contact groups Refs. A, B, D, 

E, F, G, H, J, P, S T, U, V and W (Fig 7-14) 

1A 

CLIP, for above, two required (USE ONLY 

ONCE, DO NOT REUSE) 

2 PUSHER, for contact group Ref. K (Fig 7- 

14) 

2A 



3 PUSHER, for contact group Refs. M, N, Q 

and R (Fig 7-14) 

3A 



55863-089-00 P62-0811 

56025-001-00 P62-0577 

55863-050-00 P62-0463 

56025-001-00 P62-0577 

55863-009-00 P62-0458 

56025-001-00 P62-0577 


Parts Catalog 

7.17. B RELAY PLUGBOARDS AND INSTALLATION SUPPLIES 

Table 7–16 lists the common B relay installation materials. The items listed may be 

used during the installation procedure, depending on the specific relay. Figures 7–16 

and 7–17 show example materials. Kits include plugboard, two relay mounting guide 

rods, terminals, insulators, current test terminal and mounting bolts. 

For a listing of installation tools and a tool kit, refer to Appendix C. 


Parts Catalog 

, 3B 

31 

E 

25A 

25B 

30 

11A 

Figure 7–16. B Relay Plugboards and Installation Supplies 


Parts Catalog 

WRAP AROUND 

WIRE TAGS 

(REF. 32) 

SOLDER 

TERMINAL 

(REF. 3) 

CRIMP 

TERMINAL 

(REF. 3A, 3B) 

INSULATOR 

(REF. 2) 

SLEEVE 

(REF. 29) 

BLANK B1 

PLUGBOARD 

(REF. 7) 

B2 PLUGBOARD 

KIT 

(REF. D) 

B1 PLUGBOARD 

KIT 

(REF. C) 

BLANK B2 

PLUGBOARD 

(REF. 19) 

Figure 7–17. Example Installation Supplies 

Table 7–16. B Relay Plugboard and Terminal Board Part Numbers 


A 

B 

TERMINAL, BOARD COMPLETE, with 

fourteen terminal posts, includes post nuts 

and washers, and mounting hardware 

TERMINAL BOARD COMPLETE, includes 

thirty-five terminal posts, includes post nuts 

and washers and mounting hardware 

C PLUGBOARD KIT, for all Type B, Size 1 

Relays, includes insulators Ref. 2; solder 

terminals Ref. 3; relay mounting studs with 

nuts and washers, Refs. 4, 5, 6, 8, 9; 

plugboard Ref. 7; current test post Ref. F; 

mounting bolts, nuts and washers Refs. 8, 

20, 22 and 23. Does not include registration 

plates or voltage post, Ref. E 

C1 

PLUGBOARD KIT, Same as Ref. C except 

has #16-20 AWG crimp type terminals 

59861-005-01 P62-0680 

59861-002-01 P62-0679 

59686-005-01 A62-0506 

59686-005-05 A62-0586 


Parts Catalog 

Table 7–16. B Relay Plugboard and Terminal Board Part Numbers (Cont.) 


C2 

C3 




without terminals Ref. 3 

D PLUGBOARD KIT, for all Type B, Size 2 

Relays except B2 Vane, Microchron Timer 

and VTB, includes insulators Ref. 2; solder 


nuts and washers Refs. 4, 5, 6, 8, 9; 

plugboard Ref. 19, current test post Ref. F, 

mounting bolts, nuts and washers Refs. 8, 

20, 22 and 23. Does not include registration 

plates, voltage post, Ref. E, or terminal 

block, Ref.10 

D1 

D2 

D3 

D4 

D5 

D6 

D7 

D8 

D9 

E 

PLUGBOARD KIT, Same as Ref. D except 





without terminals Ref. 3 


for Type B2 Vane Relay 

PLUGBOARD KIT, Same as Ref. D4 except 





without terminals 


for Microchron II Timer Relay 


with #16-20 AWG crimp type terminals 

VOLTAGE TEST POST COMPLETE, 

includes screw, nuts, washers and terminal, 

for measuring coil(s) voltage 

59686-005-04 A62-0650 

59686-005-08 A62-0686 

59686-007-01 A62-0508 

59686-007-06 A62-0587 

59686-007-04 A62-0635 

59686-007-10 A62-0685 

59686-007-02 A62-0509 

59686-007-07 A62-0588 

59686-007-05 A62-0636 

59686-007-16 N/A 

59686-007-12 A62-0675 

59686-007-14 A62-0692 

42788-001-02 A62-0515 


Parts Catalog 



F CURRENT TEST POST COMPLETE, 

includes screw, nuts, washers, bushing and 

connector, for opening coil circuit to 

measure coil(s) current 

42788-001-01 A62-0525 

G 

H 

J 

J1 

J2 

CURRENT TEST POST FOR VTB 

RELAYS, includes screw, nuts , washers, 

for measuring coil(s) current 

VOLTAGE TEST POST FOR VTB RELAY, 

includes screw, nuts , washers, for 

measuring coil(s) voltage 

PLUGBOARD KIT FOR VTB RELAY, Size 

2, includes insulators Ref. 2; solder 


nuts and washers, Refs. 4, 5, 6, 8, 9; 

plugboard Ref. 30; (2) current test posts 

Ref. F; (2) voltage test posts Ref. E; 

mounting bolts; nuts and washers refs. 8, 

20, 22, and 23. Does not include 

registration plates. 

PLUGBOARD KIT, Same as Ref. J except 


PLUGBOARD KIT, Same as Ref. J except 


2 INSULATOR, for holding terminal Ref. 3 in 

position on plugboard 

3 TERMINAL, solder type, two required per 

insulator 

3A 

3B 

TERMINAL, crimp type for #16 – 20 AWG 

wire, two required per insulator 

TERMINAL, crimp type for #10 – 14 AWG 

wire, two required per insulator 

42788-002-01 A62-0328 

42788-002-02 A62-0329 

59686-014-01 A62-0510 

59686-014-02 A62-0651 

59686-014-03 A62-0652 

55862-024-00 P62-0457 

55871-019-00 P62-0466 

55871-074-00 P03-0326 

55871-098-00 P03-0327 

4 NUT, knurled, for holding relay to plugboard 00846-029-00 P62-0144 

5 STUD, for holding relays except VTB Relay 

to plugboards 

5A 

STUD, Same as Ref. 5 except for VTB 

Relay 

48813-006-00 P62-0346 

48813-007-00 P62-0347 


Parts Catalog 



6 NUT, for locking nut Ref. 4 01472-008-00 P62-0166 

7 PLUGBOARD, only, for all Type B1 Relays, 

does not include terminals, insulators, test 

posts or mounting studs 

56022-049-00 P62-0572 

8 WASHER, flat .266" I.D., .500" O.D., .031" 

thick 

01250-011-ON P50-0157 

9 NUT, .250" -28 hex, elastic stop 42333-065-00 P62-0320 

10 TERMINAL BLOCK COMPLETE 46048-053-01 P62-0339 

11 SCREW, .164" -32 x .75" long. slotted pan 

head self tapping (For mounting Ref. 10 

block) 

11A WASHER, internal tooth lock .164" I.D., 

.340" O.D., .023" thick 

12 SCREW, used as terminal post for current 

and voltage test posts 

07608-224-ON P62-0596 

53029-068-00 P62-0402 

00376-009-00 P62-0107 

13 NUT, .242" -24 x .19" thick, hex 42839-005-00 P62-0333 

14 WASHER, for terminal posts, .266" I.D., 

.188" O.D., .04" thick 

01225-002-00 P76-0108 

15 NUT, .242" -24 x .31 " thick, hex 42843-001-00 P76-0131 

16 NUT, .242" -24 x .375", spanner, for current 

test post 

17 CONNECTOR, for current test post 

terminals 

00578-015-00 P62-0129 

04906-126-00 P62-0190 

18 BUSHING, insulating, for current test post 06347-031-00 P62-0203 

19 PLUGBOARD, only, for all Type B, Size 2 

Relays, does not include terminals, 

insulators, test post or mounting screws 

20 SCREW, .250" -28 x 1.25" long., fillister 

head 

22 WASHER, .250" I.D., .487" O.D., .062" 

thick, spring lock 

56022-021-00 P62-0571 

55470-004-00 P62-0448 

01273-006-ON P81-0121 


Parts Catalog 



23 NUT, .250" -28 X .22" thick, hex 01472-003-00 P62-0167 

24 PLATE, filler for blank spaces 42812-000-00 P62-0331 

25 SCREW, .250" -28 x .75" long. fillister head 55470-008-00 P62-0449 

25A NUT, .250" -28 x .22" thick, hex 01472-003-00 P62-0167 

25B WASHER, .250" I.D., .487" O.D., .062" 

thick, spring lock 

01273-006-ON P81-0121 

26 CONNECTOR, 1" centers, for Ref. B 04906-020-00 P76-0110 

26 CONNECTOR, 1.250" centers, horizontal 

for Ref. A 

26 CONNECTOR, 1.125" centers, vertical for 

Ref. A 

27 BOARD, designation, single, without 

lettering 

28 BOARD, designation, single, without 

lettering 

04906-006-00 P03-0107 

04906-021-00 P03-0108 

59683-010-01 P62-0766 

59683-006-01 P62-0767 

29 SLEEVE, rubber, insulating 35189-033-00 P62-0298 

30 PLUGBOARD ONLY, for VTB, size 2 relay, 

does not include terminals, insulators, test 

post or mounting screws 

31 AAR RING CRIMP TERMINAL, Red, #16- 

22 AWG for Tefzel wire 

31 AAR RING CRIMP TERMINAL, Blue, #14- 

16 AWG for Tefzel wire 

31 AAR RING CRIMP TERMINAL, Yellow, 

#10-12 AWG for Tefzel wire 

32 WRAP AROUND WIRE TAGS, for B1 

relays, columns 1-3 

32 WRAP AROUND WIRE TAGS, for B2 

relays, columns 4-6 

56022-031-00 N/A 

59825-223-00 N/A 

59825-222-00 N/A 

59825-199-00 N/A 

59539-405-00 P03-0305 

59539-406-00 P03-0306 


Parts Catalog 

7.18. B RELAY REGISTRATION PLATES AND GASKETS 

Figure 7–18 and Table 7–17 summarize the B relay registration plates and gaskets for 

most B relays. See Figure 7–13 and Table 7–11 for the VTB Polar Biased Relay 

registration plate and gaskets. 


Parts Catalog 

9 

8 

7 7A 

8 

7C 

7B 

A A1 A2, A3 A4 

8 

7B 

7A 

8 

7B 

7A 

9 

THERE ARE 4 VERSIONS OF THE B 

RELAY REGISTRATION PLATE. 

B 

THERE IS 1 PLUGBOARD 

REGISTRATION PLATE. 

Figure 7–18. B Relay Registration Plates and Gaskets 


Parts Catalog 

Table 7–17. B Relay Registration Plate and Gasket Part Numbers 


A REGISTRATION PLATE ASSEMBLY, 58879-000-51* P62-0720* 

includes plugboard and relay registration 

plates and mounting hardware, for all Type 

B, Size 1 relays except code-responsive 

and magnetic-stick 

A1 Same as Ref. A, except for code-responsive 58879-005-05* P62-0670* 

and magnetic-stick relays 

A2 REGISTRATION PLATE ASSEMBLY, 

includes plugboard and relay registration 

plates and mounting hardware, for all Type 

B, Size 2 code transmitter 

58879-005-04* P62-0671* 

A3 Same as Ref. A, except for Type B, Size 2 

Microchron II Timer relays 

A4 Same as Ref. A, except for Type B, Size 2 

vane relay 

A5 

B 

Same as Ref. A, except for VTB relay, see 

Figure 7–13 

PLUGBOARD REGISTRATION PLATE 

ASSEMBLY, includes one registration plate 

with 2 screws (Ref. 8) 

58879-000-53* P62-0668* 

58879-000-05* P62-0669* 

58879-009-51 N/A 

58876-000-51 N/A 

1 Gasket, for cover of Type B1 relays 13014-221-00 P62-0225 

1A 

Same as Ref. 1, except for cover of Type 

B2 relays 

2 SHIELD, for back of contact blocks, for all 

relays except Type B2 vane 

2A 

2B 

Same as Ref. 2, except for contact spaces 

4 to 6 of Type B2 vane 

Same as Ref. 2, except for contact spaces 

1 to 3 of Type B2 vane 

3 SCREW, for attaching contact group, .138- 

40 x .625" long, flat head 

13014-222-00 P62-0226 

50737-091-00 P62-0227 

13014-279-00 P62-0228 

13014-280-00 P62-0229 

03306-120-ON P62-0200 

5 GASKET, for coils of Type B1 and B2 30646-005-00 P62-0276 

neutral relays 

6 GASKET, for front of cover 30646-012-00 P62-0277 

* When ordering registration plates include the Catalog or Drawing Number of the relay that the 

registration plates are intended. 


Parts Catalog 

Table 7–17. B Relay Registration Plate and Gasket Part Numbers (Cont.) 


7 SCREW, stainless steel, .164-32 x 1.0" long 

slotted pan head, for fastening registration 

plate to base of Type B1 relay 

03608-032-ON P76-0257 

7A SCREW, stainless steel, .164-32 x 1.187" 

long slotted flat head, for fastening 

registration plate to base of Type B2 relay 

18746-033-00 P62-0249 

7B NUT, for Ref. 7, .164-32, elastic stop 42333-046-00 N/A 

7C 

WASHER, for Ref. 7, .174" I.D., .293" O.D., 

.040" thick, lock 

8 SCREW, stainless steel, .138-32 x 

.375"long, slotted flat head 

9 SCREW, stainless steel, .138-32 x .50"long, 

slotted flat head self tapping 

01273-022-ON 

N/A 

03306-012-ON P62-0193 

06306-016-ON P62-0192 


Relay Engineering Data (ED) sheet Lists 

A. APPENDIX A – RELAY ENGINEERING DATA (ED) SHEET LIST 

A.1. 

GENERAL 

This appendix includes two tables listing the B relay Engineering Data (ED) sheet 

numbers. For your convenience, the information is provided in two formats. Table A–1 

provides the ED sheet numbers by catalog number and cross-references drawing 

number. Table A–2 provides the ED sheet numbers by drawing number and crossreferences 

catalog number. 

NOTE 

ED60-1 is a generic ED sheet that applies to most relays. It provides 

general instructions covering customer adjustments and tests for neutral, 

biased-neutral, and polar relays. 

To determine a relay's drawing or catalog number, refer to Heading 1.2.2., Identification. 

P1457, Rev. Nov/07 A–1 Alstom Signaling Inc.


Table A–1. ED sheets Listed By Catalog Number 

Catalog No. Drawing No. ED sheet No. 

A62-120 56001-921-09 ED56601-921-09 

A62-122 56001-921-07 ED56001-921-07 

A62-125 56001-922-07 ED56001-922-07 

A62-126 56001-921-02 ED56001-921-02 

A62-129 56001-925-10 ED60-143 

A62-130 56001-921-05 ED56001-921-05 

A62-131 56001-921-14 ED56001-921-14 

A62-132 56001-921-10 ED56001-921-10 

A62-140 56001-922-05 ED60-274 

A62-145 56002-719-01 ED56002-719-01 

A62-150 56002-720-01 ED56002-720-01 

A62-155 56001-663-07 ED56001-663-07 

A62-156 56001-672-01 ED60-189 

A62-157 58640-172-03 ED60-108 

A62-161 56001-672-03 ED60-256 

A62-162 56001-674-01 ED60-113 

A62-163 56001-674-02 ED56001-674-02 

A62-164 58640-179-22 ED58640-179-22 

A62-170 57490-095-05 ED57490-095-05 

A62-171 57490-096-04 ED57490-096-04 

A62-172 57490-097-04 ED57490-097-04 

A62-173 57490-098-01 ED57490-098-01 

A62-175 57490-091-05 ED57490-091-05 

A62-176 57490-092-01 ED57490-092-01 

A62-177 57490-093-01 ED57490-093-01 

A62-178 57490-094-01 ED57490-094-01 

A62-205 56001-880-01 ED56001-880-01 

A62-211 56001-785-35 ED56001-785-35 

A62-213 56001-785-55 ED56001-785-55 

A62-215 56001-785-59 ED56001-785-59 

A62-217 56001-785-61 ED56001-785-61 



Table A–1. ED sheets Listed By Catalog Number (Cont.) 


A62-221 56001-873-01 ED56001-873-01 

A62-231 56001-785-10 ED56001-785-10 

A62-236 56001-865-01 ED56001-865-01 

A62-245 58645-172-06 ED58645-172-06 

A62-246 58645-172-04 ED60-110 

A62-247 58645-172-05 ED60-163 

A62-260 56001-714-03 ED60-257 

A62-261 56001-714-01 ED60-286 

A62-262 56001-762-02 ED56001-762-02 

A62-275 56001-787-02 ED60-129 

A62-276 56001-787-01 ED56001-787-01 

A62-277 56001-783-02 ED60-131 

A62-293 56001-785-91 ED60-101 

A62-295 56001-785-31 ED60-277 

A62-296 56001-762-01 ED60-297 

A62-300 56001-789-05 ED60-130 

A62-305 56001-785-37 ED60-194 

A62-308 56001-783-01 ED56001-783-01 

A62-309 56001-822-06 ED56001-822-06 

A62-310 56001-822-02 ED56001-822-02 

A62-311 56001-822-01 ED60-195 

A62-312 56001-785-83 ED60-219 

A62-314 56001-785-12 ED60-145 

A62-315 56001-872-01 ED56001-872-01 

A62-317 56001-789-03 ED60-152 

A62-318 56001-875-01 ED56001-875-01 

A62-319 56001-787-05 ED56001-787-05 

A62-320 56001-908-01 ED60-138 

A62-323 56001-670-13 ED60-215 

A62-324 56001-911-01 ED60-228 

A62-325 56001-838-01 ED60-295 





A62-330 56002-703-01 ED56002-703-01 

A62-331 56002-710-01 ED60-270 

A62-335 56001-909-01 ED56001-909-01 

A62-341 56001-790-01 ED56001-790-01 

A62-345 56001-736-01 ED60-287 

A62-350 56001-851-01 ED60-140 

A62-353 56001-830-01 ED56001-830-01 

A62-355 56001-808-26 ED56001-808-26 

A62-357 56001-792-02 ED56001-792-02 

A62-358 56001-778-01 ED56001-778-01 

A62-359 56001-780-01 ED56001-780-01 

A62-360 56001-774-01 ED56001-774-01 

A62-365 56001-904-01 ED60-172 

A62-369 56001-817-01 ED56001-817-01 

A62-370 56001-792-01 ED56001-792-01 

A62-372 56001-785-85 ED60-205 

A62-380 56001-759-01 ED56001-759-01 

A62-401 56001-721-01 ED60-319 

A62-406 56001-745-01 ED56001-745-01 

A62-407 56001-745-02 ED56001-745-02 

A62-410 56001-785-36 ED56001-785-36 

A62-415 56001-738-01 ED60-288 

A62-417 56001-901-01 ED60-211 

A62-424 56001-785-99 ED56001-785-99 

A62-425 56001-785-80 ED56001-785-80 

A62-427 56001-917-01 ED56001-917-01 

A62-429 56001-926-01 ED56001-926-01 

A62-430 56001-916-02 ED56001-916-02 

A62-431 56001-916-01 ED56001-916-01 

A62-432 56001-785-01 ED56001-785-01 

A62-433 56001-937-01 ED60-328 





A62-485 56005-100-08 ED60-170 

A62-486 56005-100-09 ED60-126 

A62-490 59301-101-01 ED60-812 

A62-491 59301-151-02 ED59301-151-02 

A62-492 59301-151-05 ED59301-151-05 

A62-493 59301-201-12 ED59301-201-12 

A62-494 59301-201-14 ED59301-201-14 

A62-495 59301-251-01 ED59301-251-01 

A62-498 59301-151-04 ED59301-151-04 

A62-519 56001-679-06 ED56001-679-06 

A62-519 56001-679-06 ED56001-679-06 

A62-522 56001-931-02 ED56001-931-02 

A62-530 59301-251-04 ED59301-251-04 

A62-532 59301-251-02 ED59301-251-02 

A62-533 59301-201-01 ED59301-201-01 

A62-534 59301-201-03 ED59301-201-03 

A62-536 59301-101-02 ED59301-101-02 

A62-537 59301-151-06 ED59301-151-06 

A62-538 59301-101-04 ED60-802 

A62-541 56002-723-01 ED56002-723-01 

A62-542 56001-950-01 ED56001-950-01 

A62-543 56001-922-02 ED56001-922-02 

A62-544 56001-763-02 ED56001-763-02 

A62-545 56001-785-21 ED56001-785-21 

A62-546 56001-881-01 ED56001-881-01 

A62-547 56005-100-01 ED56005-100-01 

A62-548 56005-100-18 ED56005-100-18 

A62-549 56001-922-01 ED56001-922-01 

A62-550 56001-922-10 ED60-336 

A62-552 56001-927-01 ED56001-927-01 

A62-553 56001-928-01 ED56001-928-01 





A62-554 56001-932-01 ED56001-932-01 

A62-555 56001-933-01 ED56001-933-01 

A62-557 56001-762-04 ED56001-762-04 

A62-559 56001-910-08 ED60-268 

A62-560 56001-914-01 ED60-155 

A62-565 56001-709-06 ED56001-709-06 

A62-566 56001-935-01 ED56001-935-01 

A62-575 56001-672-05 ED56001-672-05 

A62-578 56001-946-01 ED56001-946-01 

A62-579 56001-947-01 ED56001-947-01 

A62-580 56001-951-01 ED56001-951-01 

A62-589 56001-670-10 ED56001-670-10 

A62-595 58640-172-01 ED58640-172-01 

A62-597 56005-100-20 ED56005-100-20 

A62-598 58640-171-04 ED58640-171-04 

A62-599 56001-952-01 ED56001-952-01 

A62-601 56001-886-01 ED56001-886-01 

A62-603 56001-938-01 ED60-106 

A62-604 56001-942-01 ED56001-942-01 

A62-605 56001-943-01 ED56001-943-01 

A62-606 56002-717-02 ED60-253 

A62-607 56002-722-01 ED56002-722-01 

A62-608 56001-953-01 ED56001-953-01 

A62-610 58640-172-04 ED58640-172-04 

A62-613 56001-956-01 ED56001-956-01 

A62-614 56001-957-01 ED56001-957-01 

A62-616 56001-959-01 ED56001-959-01 

A62-617 56001-960-01 ED56001-960-01 

A62-620 56002-725-01 ED56002-725-01 

A62-622 58640-171-03 ED58640-171-03 

A62-623 56001-956-02 ED56001-956-02 





A62-624 56001-921-04 ED56001-921-04 

A62-626 58645-172-08 ED58645-172-08 

A62-629 59301-251-05 ED59301-251-05 

A62-633 56001-961-01 ED56001-961-01 

A62-634 56001-962-01 ED56001-962-01 

A62-637 56001-963-01 ED56001-963-01 

A62-638 58645-172-09 ED58645-172-09 

A62-639 56001-965-01 ED56001-965-01 

A62-642 57490-121-01 ED57490-121-01 

A62-643 57490-122-01 ED57490-122-01 

A62-644 56005-100-21 ED56005-100-21 

A62-654 56001-968-01 ED56001-968-01 

A62-655 56001-670-02 ED56001-670-02 

A62-658 56001-969-01 ED56001-969-01 

A62-659 56001-664-05 ED56001-664-05 

A62-660 56001-664-06 ED56001-664-06 

A62-661 56001-970-01 ED56001-970-01 

A62-662 59301-151-01 ED59301-151-01 

A62-663 59301-200-03 ED60-811 

A62-664 59301-101-08 ED60-814 

A62-665 56001-945-01 ED56001-945-01 

A62-667 56001-971-01 ED56001-971-01 

A62-669 56001-972-01 ED56001-972-01 

A62-670 56001-973-01 ED56001-973-01 

A62-672 56001-975-01 ED56001-975-01 

A62-676 58640-179-29 ED58640-179-29 

A62-677 56001-944-01 ED60-326 

A62-678 56001-672-02 ED60-203 

A62-679 56001-675-01 ED56001-675-01 

A62-680 58640-169-06 ED58640-169-06 

A62-681 56001-978-01 ED56001-978-01 





A62-691 50800-101-01 ED50800-101-01 

A62-694 56005-100-19 ED56005-100-19 

A62-715 56001-927-02 ED56001-927-02 

A62-716 56001-675-02 ED56001-675-02 

A62-717 56001-762-08 ED56001-762-08 

A62-718 56001-981-01 ED56001-981-01 

A62-719 56001-911-02 ED56001-911-02 

A62-720 56001-922-13 ED56001-922-13 

A62-721 56001-926-03 ED56001-926-03 

A62-722 56001-928-02 ED56001-928-02 

A62-723 56005-100-22 ED56005-100-22 

A62-724 56005-100-23 ED56005-100-23 

A62-725 57490-080-10 ED57490-080-10 

A62-733 57490-119-02 ED57490-119-02 

A62-736 56001-982-01 ED56001-982-01 

A62-740 57490-080-09 ED57490-080-09 

A62-741 56001-983-01 ED56001-983-01 

A62-742 50800-102-01 ED50800-102-01 

A62-743 56001-984-01 ED56001-984-01 

A62-744 50800-101-02 ED50800-101-02 

A62-761 50800-103-01 ED50800-103-01 

A62-763 56001-986-01 ED56001-986-01 

A62-764 56001-987-01 ED56001-987-01 

A62-765 56001-745-03 ED56001-745-03 

A62-766 56001-916-03 ED56001-916-03 

A62-767 56001-921-15 ED56001-921-15 

---- 56001-988-01 ED56001-988-01 

--- 50800-104-01 ED50800-104-01 



Table A–2. ED sheets Listed By Drawing Number 

Drawing No. Catalog No. ED sheet No. 

50800-101-01 A62-691 ED50800-101-01 

50800-101-02 A62-744 ED50800-101-02 

50800-103-01 A62-761 ED50800-103-01 

50800-104-01 --- ED50800-104-01 

56001-663-07 A62-155 ED56001-663-07 

56001-664-05 A62-659 ED56001-664-05 

56001-664-06 A62-660 ED56001-664-06 

56001-670-02 A62-655 ED56001-670-02 

56001-670-10 A62-589 ED56001-670-10 

56001-670-13 A62-323 ED60-215 

56001-672-01 A62-156 ED60-189 

56001-672-02 A62-678 ED60-203 

56001-672-03 A62-161 ED60-256 

56001-672-05 A62-575 ED56001-672-05 

56001-674-01 A62-162 ED60-113 

56001-674-02 A62-163 ED56001-674-02 

56001-675-01 A62-679 ED56001-675-01 

56001-675-02 A62-716 ED56001-675-02 

56001-679-06 A62-519 ED56001-679-06 

56001-679-06 A62-519 ED56001-679-06 

56001-709-06 A62-565 ED56001-709-06 

56001-714-01 A62-261 ED60-286 

56001-714-03 A62-260 ED60-257 

56001-721-01 A62-401 ED60-319 

56001-736-01 A62-345 ED60-287 

56001-738-01 A62-415 ED60-288 

56001-745-01 A62-406 ED56001-745-01 

56001-745-02 A62-407 ED56001-745-02 

56001-745-03 A62-765 ED56001-745-03 

56001-759-01 A62-380 ED56001-759-01 

56001-762-01 A62-296 ED60-297 



Table A–2. ED sheets Listed By Drawing Number (Cont.) 


56001-762-02 A62-262 ED56001-762-02 

56001-762-04 A62-557 ED56001-762-04 

56001-762-08 A62-717 ED56001-762-08 

56001-763-02 A62-544 ED56001-763-02 

56001-774-01 A62-360 ED56001-774-01 

56001-778-01 A62-358 ED56001-778-01 

56001-780-01 A62-359 ED56001-780-01 

56001-783-01 A62-308 ED56001-783-01 

56001-783-02 A62-277 ED60-131 

56001-785-01 A62-432 ED56001-785-01 

56001-785-10 A62-231 ED56001-785-10 

56001-785-12 A62-314 ED60-145 

56001-785-21 A62-545 ED56001-785-21 

56001-785-31 A62-295 ED60-277 

56001-785-35 A62-211 ED56001-785-35 

56001-785-36 A62-410 ED56001-785-36 

56001-785-37 A62-305 ED60-194 

56001-785-41 A62-684 ED60-225 

56001-785-55 A62-213 ED56001-785-55 

56001-785-59 A62-215 ED56001-785-59 

56001-785-61 A62-217 ED56001-785-61 

56001-785-80 A62-425 ED56001-785-80 

56001-785-83 A62-312 ED60-219 

56001-785-85 A62-372 ED60-205 

56001-785-91 A62-293 ED60-101 

56001-785-99 A62-424 ED56001-785-99 

56001-787-01 A62-276 ED56001-787-01 

56001-787-02 A62-275 ED60-129 

56001-787-05 A62-319 ED56001-787-05 

56001-789-03 A62-317 ED60-152 

56001-789-05 A62-300 ED60-130 





56001-790-01 A62-341 ED56001-790-01 

56001-792-01 A62-370 ED56001-792-01 

56001-792-02 A62-357 ED56001-792-02 

56001-808-26 A62-355 ED56001-808-26 

56001-817-01 A62-369 ED56001-817-01 

56001-822-01 A62-311 ED60-195 

56001-822-02 A62-310 ED56001-822-02 

56001-822-06 A62-309 ED56001-822-06 

56001-830-01 A62-353 ED56001-830-01 

56001-838-01 A62-325 ED60-295 

56001-851-01 A62-350 ED60-140 

56001-865-01 A62-236 ED56001-865-01 

56001-872-01 A62-315 ED56001-872-01 

56001-873-01 A62-221 ED56001-873-01 

56001-875-01 A62-318 ED56001-875-01 

56001-880-01 A62-205 ED56001-880-01 

56001-881-01 A62-546 ED56001-881-01 

56001-886-01 A62-601 ED56001-886-01 

56001-901-01 A62-417 ED60-211 

56001-904-01 A62-365 ED60-172 

56001-908-01 A62-320 ED60-138 

56001-909-01 A62-335 ED56001-909-01 

56001-910-08 A62-559 ED60-268 

56001-911-01 A62-324 ED60-228 

56001-911-02 A62-719 ED56001-911-02 

56001-914-01 A62-560 ED60-155 

56001-916-01 A62-431 ED56001-916-01 

56001-916-02 A62-430 ED56001-916-02 

56001-916-03 A62-766 ED56001-916-03 

56001-917-01 A62-427 ED56001-917-01 

56001-921-02 A62-126 ED56001-921-02 





56001-921-04 A62-624 ED56001-921-04 

56001-921-05 A62-130 ED56001-921-05 

56001-921-07 A62-122 ED56001-921-07 

56001-921-09 A62-120 ED56601-921-09 

56001-921-10 A62-132 ED56001-921-10 

56001-921-14 A62-131 ED56001-921-14 

56001-921-15 A62-767 ED56001-921-15 

56001-922-01 A62-549 ED56001-922-01 

56001-922-02 A62-543 ED56001-922-02 

56001-922-05 A62-140 ED60-274 

56001-922-07 A62-125 ED56001-922-07 

56001-922-10 A62-550 ED60-336 

56001-922-13 A62-720 ED56001-922-13 

56001-925-10 A62-129 ED60-143 

56001-926-01 A62-429 ED56001-926-01 

56001-926-03 A62-721 ED56001-926-03 

56001-927-01 A62-552 ED56001-927-01 

56001-927-02 A62-715 ED56001-927-02 

56001-928-01 A62-553 ED56001-928-01 

56001-928-02 A62-722 ED56001-928-02 

56001-931-02 A62-522 ED56001-931-02 

56001-932-01 A62-554 ED56001-932-01 

56001-933-01 A62-555 ED56001-933-01 

56001-935-01 A62-566 ED56001-935-01 

56001-937-01 A62-433 ED60-328 

56001-938-01 A62-603 ED60-106 

56001-942-01 A62-604 ED56001-942-01 

56001-943-01 A62-605 ED56001-943-01 

56001-944-01 A62-677 ED60-326 

56001-945-01 A62-665 ED56001-945-01 

56001-946-01 A62-578 ED56001-946-01 





56001-947-01 A62-579 ED56001-947-01 

56001-950-01 A62-542 ED56001-950-01 

56001-951-01 A62-580 ED56001-951-01 

56001-952-01 A62-599 ED56001-952-01 

56001-953-01 A62-608 ED56001-953-01 

56001-956-01 A62-613 ED56001-956-01 

56001-956-02 A62-623 ED56001-956-02 

56001-957-01 A62-614 ED56001-957-01 

56001-959-01 A62-616 ED56001-959-01 

56001-960-01 A62-617 ED56001-960-01 

56001-961-01 A62-633 ED56001-961-01 

56001-962-01 A62-634 ED56001-962-01 

56001-963-01 A62-637 ED56001-963-01 

56001-965-01 A62-639 ED56001-965-01 

56001-968-01 A62-654 ED56001-968-01 

56001-969-01 A62-658 ED56001-969-01 

56001-970-01 A62-661 ED56001-970-01 

56001-971-01 A62-667 ED56001-971-01 

56001-972-01 A62-669 ED56001-972-01 

56001-973-01 A62-670 ED56001-973-01 

56001-975-01 A62-672 ED56001-975-01 

56001-976-01 A62-689 ED56001-976-01 

56001-978-01 A62-681 ED56001-978-01 

56001-979-01 A62-682 ED56001-979-01 

56001-980-01 A62-690 ED56001-980-01 

56001-981-01 A62-718 ED56001-981-01 

56001-982-01 A62-736 ED56001-982-01 

56001-983-01 A62-741 ED56001-983-01 

56001-984-01 A62-743 ED56001-984-01 

56001-986-01 A62-763 ED56001-986-01 

56001-987-01 A62-764 ED56001-987-01 





56001-988-01 ---- ED56001-988-01 

56002-703-01 A62-330 ED56002-703-01 

56002-710-01 A62-331 ED60-270 

56002-717-02 A62-606 ED60-253 

56002-719-01 A62-145 ED56002-719-01 

56002-720-01 A62-150 ED56002-720-01 

56002-722-01 A62-607 ED56002-722-01 

56002-723-01 A62-541 ED56002-723-01 

56002-725-01 A62-620 ED56002-725-01 

56005-100-01 A62-547 ED56005-100-01 

56005-100-08 A62-485 ED60-170 

56005-100-09 A62-486 ED60-126 

56005-100-18 A62-548 ED56005-100-18 

56005-100-19 A62-694 ED56005-100-19 

56005-100-20 A62-597 ED56005-100-20 

56005-100-21 A62-644 ED56005-100-21 

56005-100-22 A62-723 ED56005-100-22 

56005-100-23 A62-724 ED56005-100-23 

57490-080-09 A62-740 ED57490-080-09 

57490-080-10 A62-725 ED57490-080-10 

57490-091-05 A62-175 ED57490-091-05 

57490-092-01 A62-176 ED57490-092-01 

57490-093-01 A62-177 ED57490-093-01 

57490-094-01 A62-178 ED57490-094-01 

57490-095-05 A62-170 ED57490-095-05 

57490-096-04 A62-171 ED57490-096-04 

57490-097-04 A62-172 ED57490-097-04 

57490-098-01 A62-173 ED57490-098-01 

57490-119-02 A62-733 ED57490-119-02 

57490-121-01 A62-642 ED57490-121-01 

57490-122-01 A62-643 ED57490-122-01 





58640-169-06 A62-680 ED58640-169-06 

58640-171-03 A62-622 ED58640-171-03 

58640-171-04 A62-598 ED58640-171-04 

58640-172-01 A62-595 ED58640-172-01 

58640-172-03 A62-157 ED60-108 

58640-172-04 A62-610 ED58640-172-04 

58640-179-22 A62-164 ED58640-179-22 

58640-179-29 A62-676 ED58640-179-29 

58645-172-04 A62-246 ED60-110 

58645-172-05 A62-247 ED60-163 

58645-172-06 A62-245 ED58645-172-06 

58645-172-08 A62-626 ED58645-172-08 

58645-172-09 A62-638 ED58645-172-09 

59301-101-01 A62-490 ED60-812 

59301-101-02 A62-536 ED59301-101-02 

59301-101-04 A62-538 ED60-802 

59301-101-08 A62-664 ED60-814 

59301-151-01 A62-662 ED59301-151-01 

59301-151-02 A62-491 ED59301-151-02 

59301-151-04 A62-498 ED59301-151-04 

59301-151-05 A62-492 ED59301-151-05 

59301-151-06 A62-537 ED59301-151-06 

59301-200-03 A62-663 ED60-811 

59301-201-01 A62-533 ED59301-201-01 

59301-201-03 A62-534 ED59301-201-03 

59301-201-12 A62-493 ED59301-201-12 

59301-201-14 A62-494 ED59301-201-14 

59301-251-01 A62-495 ED59301-251-01 

59301-251-02 A62-532 ED59301-251-02 

59301-251-04 A62-530 ED59301-251-04 

59301-251-05 A62-629 ED59301-251-05 





Glossary 

B. APPENDIX B - GLOSSARY 

B.1. 

CONTACT DEFINITIONS 

Back – (B) Relay contact that is made when relay is de-energized (normally closed). 

Break - All front or back contacts are just open when a gauge of a specific dimension is 

inserted between the armature residual screw and the core face with the relay 

energized. 

Break-before-make -In a dependent front-heel-back contact the back contact will break 

before the front contact makes as the relay is energized. 

Contact Application 

• D = Dry Circuit 

• EHD = Extra Heavy-Duty 

• HV = High Voltage 

• HD = Heavy-Duty 

• LD = Light Duty 

• MD = Medium Duty 

• S = Safety 

• XHD = Heavy-Duty with Blowout Magnets 

Contact Materials – 

• AgC = Silver Impregnated Carbon 

• AgPt = Silver Platinum 

• G = Gold 

• S = Silver 

• SCdO = Silver Cadmium Oxide 

• T = Tungsten 

Front – (F) Relay contact that is normally open when relay is de-energized. 

Heel – (H) Contact that is driven by pusher. 

P1457, Rev. Nov/07 B–1 Alstom Signaling Inc.

Glossary 

Make - Specified dimension that will cause all front or back contacts to be just made 

(closed) when a gauge of this dimension is inserted between the armature residual 

screw and core face with the relay energized. 

Makes-before-break – (MB) In a dependent front-heel-back contact the front contact will 

make before the back contact breaks. 

B.2. 

GENERAL DEFINITIONS 

Approximate - on relay ordering sheets the abbreviation "approx." When used with 

armature air gap, it indicates that this air gap is to be adhered to as closely as possible. 

In no case should this value be less than the minimums given in Section 1.4 (armature 

air gap) of ED60-1. 

NOTE 

ED60-1 is a generic ED sheet that applies to most relays. It provides 

general instructions covering customer adjustments and tests for neutral, 

biased-neutral, and polar relays. 

Armature Air Gap - The closest point between armature and core face measured when 

the relay is energized. 

Coil Resistance - This is total coil resistance of relay under test. 

Contact Resistance - Total resistance of the individual contact as measured at the 

terminals of the relay under test. Resistance to be measured at 1 amp contact current. 

Back (NC) measurements made with relay de-energized. Front (NO) measurements 

made with relay energized to normal WORKING current. 

Down Pressure - Pressure put on fingers so that when contact group is assembled on 

relay, all front contacts will be open and all heel contacts will just be making contact with 

the back contacts. In addition, each roller must sit on the bottom of its slot when the 

pusher is raised to just open the back contacts. 

DROP AWAY – (DA) Current or voltage specified on Ordering sheet at which relay just 

makes its back contacts. This value is taken after the relay is saturated to a specified 

value of current. 

Hi-Pot Test (B1 and B2) - The insulation of coils and contacts shall withstand 3000V at 

60 Hz. 

NOTE 

For subsequent tests, voltage should be reduced 20 percent each time. 


Glossary 

Overpressure - 

• Dead Weight - Pressure applied at the residual screw to just raise the bridge stop 

screw from its stop with the overpressure compression spring ineffective. 

• Final Pressure - Pressure applied at the residual screw to just raise the bridge stop 

screw from its stop with the overpressure compression spring effective. 

Pick Up Transition Time - Crossover time from break back to make front contact. 

PICKUP Current or Voltage – (PU) Specified current or voltage at which the relay just 

makes its front contacts. 

PICKUP Time - Time required for a relay to make any one of its front contacts after Pick 

Up current or voltage is applied. 

Release Time - Time required for a relay to break any one of its front contacts after the 

relay is de-energized. 

Release Transition Time - Crossover time from break front to make back contacts. 

Saturation – (Sat) Current necessary to saturate magnetic structure of relay. 

Trapped Pressure - Pressure required to just lift a contact off the stop plate without 

contacting the pressure plate. 

WORKING Current or Voltage – (WC) Current or voltage specified on ordering sheet 

needed to energize relay to its front stop. 


Glossary 



Tools and Kits 

C. APPENDIX C – TOOLS AND KITS 

C.1. 

GENERAL 

This section summarizes the tools and tool kits used for B relay installation, 

maintenance, and troubleshooting. For installation materials refer to Section 7. 

C.2. 

CORRECTIVE MAINTENANCE TOOLS AND TOOL KITS 

Table C–1 lists the tools required to perform the test and adjustment procedures on 

typical B relays; tools for special purpose relays are not listed. Figure C–1 includes 

many of the tools listed in Table C–1. Consult Alstom Signaling Inc. customer service if 

additional tools are required. 

Table C–2 lists the tools required to perform the test and adjustment procedures on 

typical B relays that are not available from Alstom. 

For relay specific items such as terminals, insulators, and tags, see the specific parts 

list. 

Table C–1. Alstom B Relay Tools 

Ref. Description Alstom Part 

Number 

1 AAR Ring Terminal Hand Crimp Tool, for AWG. 10-20 wire 24745-145-00 

2 AAR Wrench 15194-010-02 

3 Burnishing Tool, used to clean off B relay AgC contacts only 55411-003-00 

4 Extractor, for plugboard terminal 59688-000-00 

5 Gauge, Pronging, for checking alignment gap, use with: 

• Gauge, Indexer (for B1 Relays) 

• Gauge, Indexer (for B2 Relays) 

6 Gauge, Step, .033- .040- .140 -.118- .113, for setting bridge 

travel and makes/breaks for .125 inch front contact opening 

relays 

7 Gauge, Step, .033- .040- .120 -.098- .093, for setting bridge 

travel and makes/breaks for .125 inch front contact opening 

relays 

56260-014-01 

56260-008-01 

56260-010-01 

36183-064-00 

36183-065-00 

8 Hand Crimp Tool, B relay terminal, for AWG. 10-20 wire 24745-148-00 

Shop Test Rack (See Fig. C–2) 56573-002-01 

P1457, Rev. Nov/07 C–1 Alstom Signaling Inc.


Table C–1. Alstom B Relay Tools (Cont.) 

Ref. Description Alstom Part 

Number 

9 Spanner Nut Wrench for B Relay 3E Post 55393-003-01 

10 

A 

B 

C 

D 

E 

F 

G 

H 

I 

Standard Tool Kit; contains the following minimum 

tools/gauges required to readjust Alstom type B1 and B2 

neutral and biased-neutral relays: 

• Gauge, Pressure, 50-6-50 grams, for checking pressures 

• Gauge, Pressure, 150-15-150 grams, for checking 

pressures 

• Gauge, Step, .026-.029-.073-.056-.053, for setting bridge 

travel and makes/breaks 

• Gauge, Step, .033-.040-.087-.065-.060, for setting bridge 

travel and makes/breaks 

• Tool, Alignment, for aligning contact springs so contacts 

meet square 

• Tool, Combination, to bend inside contact group 

pressure/stop plates and to align heel springs 

• Tool, to bend/align contact springs 

• Tool, to bend stop and pressure plates 

• Handle for stop and pressure plate bender 

59649-206-01 

(55412-000-00) 

(55412-004-00) 

(36183-062-00) 

(36183-063-00) 

(47951-021-00) 

(47951-058-00) 

(47951-024-00) 

(47951-025-00) 

(35718-003-00) 

11 Tool, for bending bridge extension 47951-023-00 

Vane Relay Test Unit (See Fig. C–3) 20182-111-01 

Most tools with Alstom part numbers are special order items. Check with Alstom 

Signaling Inc. customer service for price and delivery information. 



1 

A 

B 

AAR CRIMP TOOL 

2 

AAR WRENCH 

GAUGE, PRESSURE, 

50-6-50 (GRAMS) 

GAUGE, PRESSURE, 

150-15-150 (GRAMS) 

3 

C 

BURNISHING TOOL 

4 

GAUGE, STEP, .026-.029-.073-.056-.053 

EXTRACTOR 

D 

5 

10 

E 

GAUGE, STEP, .033-.040-.087-.065-.060 

TOOL, ALIGNMENT 

F 

GAUGE, INDEXER 

GAUGE, PRONGING 

G 

TOOL, COMBINATION 

TOOL TO BEND / ALIGN CONTACT SPRINGS 

6 

GAUGE, STEP, .033- .040- .140 -.118- .113 

H 

I 

7 

GAUGE, STEP, 033- .040- .120 -.098- .093 

TOOL TO BEND STOP 

AND PRESSURE 

PLATES 

HANDLE FOR H 

8 

11 

HAND CRIMP TOOL, FOR AWG 10-20 WIRE 

TOOL, FOR BENDING BRIDGE EXTENSION 

9 

SPANNER NUT WRENCH 

Figure C–1. Alstom B Relay Tools 



Table C–2. B Relay Tools Not Available From Alstom 

Description 

Bond Paper (for cleaning carbon contacts) 

Gauge, Feeler .002 Through .035 (for setting air gap) 

Gauge, Feeler, Combination .002 and .004 (for checking air gap between armature and 

retaining plate) 

Glue, Pliobond 20, McMaster Carr (to glue top end of contact groups to base) 

Magnifier, Illuminated Magna- Lite Model 100 (5 Power) (to inspect relays) 

Multimeter/DMM Fluke 87 or equivalent 

Pin Gauge, .050 inch (for checking front contact openings) 



Screw Drivers, Standard (for tightening screws) 

Seal Press, 5 Inch Bulldog Seal Press (for applying seal to relay) order from American 

Casting, Inc. Also order custom dies for press to identify adjuster/property 

Solder, Rosin Core, 60% tin, 40% lead 

Soldering Iron, 120-volt, 50-watt 

Wire Cutter 

Wire Stripper 

Wrenches, Open End, 11/32 - 5/16 (for tightening armature air gap and bridge travel 

jam nuts) 



C.3. 

SHOP TEST RACK 

The Shop Test Rack, P/N 56573-002-01, is used to test relays in the shop. When 

complete tests are necessary, the relay is taken out of service and tested by plugging it 

on the test rack, Figure C–2. 

G 

16 26 36 

15 25 35 

14 24 34 

13 23 33 

12 22 32 

11 21 31 

E 

46 

45 

44 

43 

42 

41 

F 

56 

66 

55 65 

54 64 

53 63 

52 62 

51 61 

6C 

6D 

D 

C 

1C 

1D 

6C 

6D 

C 

D 

A 

B 

X 

Figure C–2. Shop Test Rack 

This rack is designed for both B1 and B2 relays. One of the guide rods is removable. 

When testing B1 relays position the guide rod in location F. For testing B2 relays 

position it in location E. Meter leads should have alligator clips for clipping on to terminal 

posts G. 



C.4. 

VANE RELAY TEST UNIT 

Electrical tests for operating values on Type B2 two element vane relays are made with 

the test unit shown in Figure C–3 (P/N 20182-111-01). This test unit does not include 

the ammeters or volt meters required to read relays local and track operating values. 

VANE RELAY TEST UNIT 

ON 

POWER 

ON 

FUSE 

POWER 

LINE/ 

TRACK 

ON 

LOCAL 

2 AMP 

ON 

ON 

SHUNT 

OFF 

OFF 

– + CURRENT – + 

COARSE 

FINE 

– + VOLTS – + 

– + COIL – + 

Figure C–3. Vane Relay Test Unit, Front Panel 

Unit dimensions are 10" high by 17" wide by 5" deep. Major board components are as 

follows: 

• Two non-inductive adjustable resistors 

• One 50-ohm fixed resistor 

• Fuse clips and 2-ampere fuse 

• Track element power switch 

• Short circuiting switches 

• Test jacks for meter hookup 



The vane relay test unit's circuit, meter connections, and vane relay connections are 

shown in Figure C–4. The unit can be powered form a variable 120 VAC source or the 

user can add a tapped transformer to adjust the supply line to the current LOCAL 

winding voltage. The user provides the ammeters and voltmeters for measuring the 

vane relay's DROPAWAY, PICKUP, and WORKING currents and voltages. Two 

potentiometers and series resistance control the current and voltage to the controlled 

element of the vane relay under test. Potentiometer Rp is 250 ohms and potentiometer 

Rs is 100 ohms, both are non-inductive resistances. Rp is connected directly across the 

supply line and Rs is connected as a variable series resistance. Rp gives a coarse wide 

range adjustment, and Rs gives a fine adjustment, to be used near the DROPAWAY, 

PICKUP, and WORKING values of the relay. 

POWER 

FUSE 

2A 

LINE 

EARTH 

NEUTRAL 

12 11 

SW1 

TP1 

SW2 

12 

11 

LINE/TRACK 

POWER 

Rs 

FINE 

100 OHMS 

AC SUPPLY LINE 

SW-1 

POWER 

ON 

LINE/TRACK 

POWER 

Rp 

COURSE 

250 OHMS 

R1 

50 OHMS 

22 

21 

SHUNT 

12 11 

SW3 

SHUNT 

11 12 

SW4 

CURRENT 

VOLTS 

COIL 

2 ELEMENT VANE RELAY 

COIL 

VOLTS 

CURRENT 

– + + – – + + – – + + - 

AMMETER 

0-250 mA 

VOLTMETER 

0-150 VOLTS 

11 

14 

12 

13 

LOCAL 

R 

TRACK 

61 

64 

62 

63 

VOLTMETER 

0-150 VOLTS 

AMMETER 

0-2 AMPS 

LOCAL 

TRACK 

Figure C–4. Vane Relay Test Unit Circuit with Relay 



The vane relay picks when there is a current phase difference between the LOCAL 

winding and the TRACK winding. To pick the vane relay with the vane relay test unit the 

phase angle is induced. To create the current phase difference and cause the vane 

relay to pick, the test unit's LOCAL winding, powered off the supply line, has an inherent 

phase shift in that the current lags the voltage by 70 or 80 degrees depending on the 

relay type. Refer to the Alstom Engineering Data (ED) sheets for the vane relay to 

determine the relay's Inherent Phase Angle value, see listing in Appendix A. The test 

unit's TRACK winding voltage is reduced from the supply line by a very large series 

resistance relative to the impedance of the track winding, so it demonstrates almost no 

current/voltage phase shift. Since the current in the LOCAL winding lags the current in 

the TRACK winding, this provides the phase difference to pick the relay. 

Using this test unit allows the user to measure current/voltage values that closely match 

the operating values of the vane relay under service conditions. 

In testing some vane relays, a transformer may have to be inserted in the circuit. For 

example testing relays with 5 volt TRACK windings requires adding a Universal 

Transformer, P/N 31094-000-01 (Cat. A95-50) to step up the Track voltage. Refer to the 

vane relay's ED sheet for details. A list of ED sheets is provided in Appendix A. 


FOR QUESTIONS AND INQUIRIES, CONTACT CUSTOMER SERVICE AT 

1-800-717-4477 

OR 

WWW.ALSTOMSIGNALINGSOLUTIONS.COM 

ALSTOM SIGNALING INC. 

1025 JOHN STREET 

WEST HENRIETTA, NY 14586

Type B Vital Relays - Alstom

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?