IEEE Device Numbers
IEEE Standard Device Numbers
1
Master Element
Master Element
2
Time Delay Starting or Closing Relay
Time Delay Starting or Closing Relay
3
Checking or Interlocking Relay
Checking or Interlocking Relay
4
Master Contactor
Master Contactor
5
Stopping Device
Stopping Device
6
Starting Circuit Breaker
Starting Circuit Breaker
7
Rate of Change Relay
Rate of Change Relay
8
Control Power Disconnecting Device
Control Power Disconnecting Device
9
Reversing Device
Reversing Device
10
Unit Sequence Switch
Unit Sequence Switch
11
Multifunction Device
Multifunction Device
12
Overspeed Device
Overspeed Device
13
Oversynchronism Device
Oversynchronism Device
14
Underspeed Device
Underspeed Device
15
Speed or Frequency Matching Device
Speed or Frequency Matching Device
16
Reserved (Voltage Balance in some uses)
Reserved (Voltage Balance in some uses)
17
Shunting or Discharge Switch
Shunting or Discharge Switch
18
Accelerating or Decelerating Device
Accelerating or Decelerating Device
19
Starting-to-Running Transition Contactor
Starting-to-Running Transition Contactor
20
Electrically Operated Valve
Electrically Operated Valve
21
Distance Relay
Distance Relay
22
Equalizer Circuit
Equalizer Circuit
23
Temperature Control Device
Temperature Control Device
24
Volts per Hertz Relay
Volts per Hertz Relay
25
Synchronizing or Synchronism Check Device
Synchronizing or Synchronism Check Device
26
Apparatus Thermal Device
Apparatus Thermal Device
27
Undervoltage Relay
Undervoltage Relay
28
Flame Detector
Flame Detector
29
Isolating Contactor
Isolating Contactor
30
Annonciator Relay
Annonciator Relay
31
Separate Excitation Device
Separate Excitation Device
32
Directional Power Relay
Directional Power Relay
33
Position Switch
Position Switch
34
Master Sequence Device
Master Sequence Device
35
Brush Operating or Slip-ring Short Circuiting Device
Brush Operating or Slip-ring Short Circuiting Device
36
Polarity or Polarizing Voltage Device
Polarity or Polarizing Voltage Device
37
Undercurrent or Underpower Relay
Undercurrent or Underpower Relay
38
Bearing Protective Device
Bearing Protective Device
39
Mechanical Condition Monitor
Mechanical Condition Monitor
40
Field Relay
Field Relay
41
Field Circuit Breaker
Field Circuit Breaker
42
Running Circuit Breaker
Running Circuit Breaker
43
Manual Transfer or Selector Device
Manual Transfer or Selector Device
44
Unit Sequence Starting Relay
Unit Sequence Starting Relay
45
Atmospheric Condition Monitor
Atmospheric Condition Monitor
46
Reverse Phase or Negative Sequence Relay
Reverse Phase or Negative Sequence Relay
47
Phase Sequence Voltage Relay
Phase Sequence Voltage Relay
48
Incomplete Sequence Relay
Incomplete Sequence Relay
49
Machine or Transformer Thermal Relay
Machine or Transformer Thermal Relay
50
Instantaneous Overcurrent Relay
Instantaneous Overcurrent Relay
51
AC Time Overcurrent Relay
AC Time Overcurrent Relay
52
AC Circuit Breaker
AC Circuit Breaker
53
Exciter or DC Generator Relay
Exciter or DC Generator Relay
54
High-speed DC Circuit Breaker
High-speed DC Circuit Breaker
55
Power Factor Relay
Power Factor Relay
56
Field Application Relay
Field Application Relay
57
Short-circuiting or Grounding Device
Short-circuiting or Grounding Device
58
Rectification Failure Relay
Rectification Failure Relay
59
Overvoltage Relay
Overvoltage Relay
60
Voltage or Current Balance Relay
Voltage or Current Balance Relay
61
Density Switch or Sensor
Density Switch or Sensor
62
Time Delay Stopping or Opening Relay
Time Delay Stopping or Opening Relay
63
Pressure Switch
Pressure Switch
64
Ground Detector Relay
Ground Detector Relay
65
Governor
Governor
66
Notching or Jogging Device
Notching or Jogging Device
67
AC Directional Overcurrent Relay
AC Directional Overcurrent Relay
68
Blocking Relay
Blocking Relay
69
Permissive Control Device
Permissive Control Device
70
Rheostat
Rheostat
71
Liquid or Gas Level Switch
Liquid or Gas Level Switch
72
DC Circuit Breaker
DC Circuit Breaker
73
Load Resistor
Load Resistor
74
Alarm Relay
Alarm Relay
75
Position Changing Mechanism
Position Changing Mechanism
76
DC Overcurrent Relay
DC Overcurrent Relay
77
Telemetering Device
Telemetering Device
78
Out-of-Step Relay
Out-of-Step Relay
79
AC Reclosing Relay
AC Reclosing Relay
80
Flow Switch
Flow Switch
81
Frequency Relay
Frequency Relay
82
DC Reclosing Relay
DC Reclosing Relay
83
Selective Control or Transfer Relay
Selective Control or Transfer Relay
84
Operating Mechanism
Operating Mechanism
85
Carrier or Pilot-wire Relay
Carrier or Pilot-wire Relay
86
Lockout Relay
Lockout Relay
87
Differential Protective Relay
Differential Protective Relay
88
Auxiliary Motor or Motor Generator
Auxiliary Motor or Motor Generator
89
Line Switch
Line Switch
90
Regulating Device
Regulating Device
91
Voltage Directional Relay
Voltage Directional Relay
92
Voltage and Power Directional Relay
Voltage and Power Directional Relay
93
Field-changing Contactor
Field-changing Contactor
94
Tripping or Trip-free Relay
Tripping or Trip-free Relay