IEEE Device Numbers & Functions

The devices in switching equipment are referred to by numbers, according to the functions they perform. These numbers are based on a system which has been adopted as standard for automatic switchgear by IEEE. This system is used on connection diagrams, in instruction books and in specifications.

Device
No.

Function
Device
No.

Function
1 Master Element 49 Machine Or Transformer Thermal Relay
2 Time-Delay Starting Or Closing Relay 50 Instantaneous Overcurrent Or Rate-Of-Rise 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 High-Speed DC Circuit Breaker
7 Anode Circuit Breaker 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 Power Rectifier Misfire Relay
11 (Reserved For Future Application) 59 Overvoltage Relay
12 Overspeed Device 60 Voltage Balance Relay
13 Synchronous-Speed Device 61 Current Balance Relay
14 Underspeed Device 62 Time Delay Stopping or Opening Relay
15 Speed, Or Frequency Matching Device 63 Liquid Or Gas Pressure Level Or Flow Relay
16 (Reserved For Future Application) 64 Ground Protective Relay
17 Shunting Or Discharge-Switch 65 Governor
18 Accelerating Or 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 Electrically Operated Rheostat
23 Temperature Control Device 71 (Reserved For Future Application)
24 (Reserved For Future Application) 72 DC Circuit Breaker
25 Synchronizing Or Synchronism Check 73 Load Resistor Contactor
26 Apparatus Thermal Device 74 Alarm Relay
27 Undervoltage Relay 75 Position-Changing Mechanism
28 (Reserved For Future Application 76 DC Overcurrent Relay
29 Isolating Contactor 77 Pulse Transmitter
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 (Reserved For Future Application)
33 Position Switch 81 Frequency Relay
34 Motor-Operated Sequence Switch 82 DC Reclosing Relay
35 Brush-Operating or Slip-Ring Short-Circuiting Device 83 Automatic Selective Control Or Transfer Relay
36 Polarity Device 84 Operating Mechanism
37 Undercurrent Or Underpower Relay 85 Carrier Or Pilot-Wire Receiver Relay
38 Bearing Protective Device 86 Locking-Out Relay
39 (Reserved For Future Application) 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 (Reserved For Future Application) 93 Field-Changing Contactor
46 Reverse-Phase-Balance Current Relay 94 Tripping Or Trip-Free Relay
47 Phase-Sequence Voltage Relay 95
48 Incomplete Sequence Relay 96
97 (Reserved For Special Application)
98
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