IEEE device numbers and functions for switchgear apparatus

1 Master element 49 Machine or transformer thermal relay
2 Time-delay starting or closing relay 50 Instantaneous overcurrent relay
3 Checking or interlocking relay 51 Ac time overcurrent relay
4 Master contactor 52 Ac circuit breaker
5 Stopping device 53 Exciter or dc generator relay
6 Starting circuit breaker 54 Turning gear engaging device
7 Rate-of-rise relay 55 Power factor relay
8 Control power disconnecting device 56 Field application relay
9 Reversing device 57 Short-circuiting or grounding device
10 Unit sequence switch 58 Rectification failure relay
11 Multifunction device 59 Overvoltage relay
12 Overspeed device 60 Voltage or current balance relay
13 Synchronous-speed device 61 Density switch or sensor
14 Underspeed device 62 Time-delay stopping or opening relay
15 Speed or frequency matching device 63 Pressure switch
16 Reserved for future application 64 Ground detector relay
17 Shunting or discharge switch 65 Governor
18 Accelerating or decelerating device 66 Notching or jogging device
19 Starting-to-running transition contactor 67 Ac directional overcurrent relay
20 Electrically operated valve 68 Blocking relay
21 Distance relay 69 Permissive control device
22 Equalizer circuit breaker 70 Rheostat
23 Temperature control device 71 Level switch
24 Volts per hertz relay 72 Dc circuit breaker
25 Synchronizing or synchronism check device 73 Load-resistor contactor
26 Apparatus thermal device 74 Alarm relay
27 Undervoltage relay 75 Position changing mechanism
28 Flame detector 76 Dc overcurrent relay
29 Isolating contactor 77 Telemetering device
30 Annunciator relay 78 Phase-angle measuring or out-of step protective relay
31 Separate excitation device 79 Ac reclosing relay
32 Directional power relay 80 Flow switch
33 Position switch 81 Frequency relay
34 Master sequence device 82 Dc load-measuring reclosing relay
35 Brush-operating or slip-ring short circuitingdevice 83 Automatic selective control or transfer relay
36 Polarity or polarizing voltage device 84 Operating mechanism
37 Undercurrent or underpower relay 85 Carrier or pilot-wire receiver relay
38 Bearing protective device 86 Lockout relay
39 Mechanical condition monitor 87 Differential protective relay
40 Field relay 88 Auxiliary motor or motor generator
41 Field circuit breaker 89 Line switch
42 Running circuit breaker 90 Regulating device
43 Manual transfer or selector device 91 Voltage directional relay
44 Unit sequence starting relay 92 Voltage and power directional relay
45 Atmospheric condition monitor 93 Field-changing contactor
46 Reverse-phase or phase-balance current relay 94 Tripping or trip-free relay
47 Phase-sequence or phase-balance voltage relay 95,96,97,98,99 Used only for specific applications on individual installations where none of the assigned numbered functions from 1 to 94 is suitable.
48 Incomplete sequence relay    


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