Appendix C
Standard Device Numbers Used in Protection Systems
Some of the frequently used device numbers are listed in the following. A complete list and definitions are given in ANSI/IEEE Standard C37.2-1079.
- 1. Master element: normally used for hand-operated devices
- 2. Time-delay starting or closing relay
- 3. Checking or interlocking relay
- 4. Master contactor
- 5. Stopping device
- 6. Starting circuit breaker
- 7. Anode circuit breaker
- 8. Control power disconnecting device
- 9. Reversing device
- 10. Unit sequence switch
- 12. Synchronous-speed device
- 14. Underspeed device
- 15. Speed- or frequency-matching device
- 17. Shunting or discharge switch
- 18. Accelerating or decelerating device
- 20. Electrically operated valve
- 21. Distance relay
- 23. Temperature control device
- 25. Synchronizing or synchronism-check device
- 26. Apparatus thermal device
- 27. Undervoltage relay
- 29. Isolating contactor
- 30. Annunciator relay
- 32. Directional power relay
- 37. Undercurrent or underpower relay
- 46. Reverse-phase or phase-balance relay
- 47. Phase-sequence voltage relay
- 48. Incomplete-sequence relay
- 49. Machine or transformer thermal relay
- 50. Instantaneous overcurrent or rate-of-rise relay
- 51. AC time overcurrent relay
- 52. AC circuit breaker: mechanism-operated contacts are as follows:
- 52a, 52aa: open when breaker, closed when breaker contacts closed
- 52b, 52bb: operates just as mechanism motion start; known as high-speed contacts
- 55. Power factor relay
- 57. Short-circuiting or grounding device
- 59. Overvoltage relay
- 60. Voltage or current balance relay
- 62. Time-delay stopping or opening relay
- 64. Ground detector relay
- 67. AC directional overcurrent relay
- 68. Blocking relay
- 69. Permissive control device
- 72. AC circuit breaker
- 74. Alarm relay
- 76. DC overcurrent relay
- 78. Phase-angle measuring or out-of-step protective relay
- 79. AC reclosing relay
- 80. Flow switch
- 81. Frequency relay
- 82. DC reclosing relay
- 83. Automatic selective control or transfer relay
- 84. Operating mechanism
- 85. Carrier or pilot-wire receiver relay
- 86. Lockout relay
- 87. Differential protective relay
- 89. Line switch
- 90. Regulating device
- 91. Voltage directional relay
- 92. Voltage and power directional relay
- 93. Field-changing contactor
- 94. Tripping or trip-free relay
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