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IEEE C37.2 Devices
IEEE / ANSI device names and numbers
94
Electrical Engineering
Not Applicable
03/29/2016
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Term
1
 Definition
Master Element
Term
2
 Definition
Time Delay Starting or Closing Relay
Term
3
 Definition
Checking or Interlocking Realy
Term
4
 Definition
Master Contactor
Term
5
 Definition
Stopping Device
Term
6
 Definition
Starting Circuit Breaker
Term
7
 Definition
Rate of Change Relay
Term
8
 Definition
Control Power Disconnecting Device
Term
9
 Definition
Reversing Device
Term
10
 Definition
Unit Sequence Switch
Term
11
 Definition
Multifunction Device
Term
12
 Definition
Overspeed Device/Protection
Term
13
 Definition
Synchronous-Speed Device
Term
14
 Definition
Underspeed Device
Term
15
 Definition
Speed or Frequency Matching Device
Term
16
 Definition
Communication Networking Device
Term
17
 Definition
Shunting or Discharge Switch
Term
18
 Definition
Accelerating or Decelerating Device
Term
19
 Definition
Motor Starter / Starting-to-Running Transition Contactor
Term
20
 Definition
Electrically-Operated Valve
Term
21
 Definition
Distance Relay
Term
22
 Definition
Equalizer Circuit Breaker
Term
23
 Definition
Temperature Control Device
Term
24
 Definition
Volts-per-Hertz Relay / Overfluxing
Term
25
 Definition
Synchronizing or Synchronism-Check Device
Term
26
 Definition
Apparatus Thermal Device
Term
27
 Definition
Undervoltage Relay
Term
28
 Definition
Flame Detector
Term
29
 Definition
Isolating Contactor
Term
30
 Definition
Annunciator Relay
Term
31
 Definition
Separate Excitation Device
Term
32
 Definition
Directional Power Relay
Term
33
 Definition
Position Switch
Term
34
 Definition
Master Sequence Device
Term
35
 Definition
Brush-Operating or Slip-ring Short Circuiting Device
Term
36
 Definition
Polarity or Polarizing Voltage Device
Term
37
 Definition
Undercurrent or Underpower Relay
Term
38
 Definition
Bearing Protective Device / Bearing Rtd
Term
39
 Definition
Mechanical Condition Monitor
Term
40
 Definition
Field Relay / Loss of Excitation
Term
41
 Definition
Field Circuit Breaker
Term
42
 Definition
Running Circuit Breaker
Term
43
 Definition
Manual Transfer or Selector Device
Term
44
 Definition
Unit Sequence Starting Relay
Term
45
 Definition
Atmospheric Condition Monitor
Term
46
 Definition
Reverse-Phase or Phase Balance Current Relay or Stator Current Unbalance
Term
47
 Definition
Phase-Sequence or Phase Balance Voltage Relay
Term
48
 Definition
Incomplete Sequence Relay / Blocked Rotor
Term
49
 Definition
Machine or Transformer Thermal Relay / Thermal Overload
Term
50
 Definition
Instantaneous Overcurrent Relay
Term
51
 Definition
Ac Time Overcurrent Relay
Term
52
 Definition
Ac Circuit Breaker
Term
53
 Definition
Exciter or Dc Generator Relay
Term
54
 Definition
Turning Gear Engaging Device
Term
55
 Definition
Power Factor Relay
Term
56
 Definition
Field Application Relay
Term
57
 Definition
Short-Circuiting or Grounding Device
Term
58
 Definition
Rectification Failure Relay
Term
59
 Definition
Overvoltage Relay
Term
60
 Definition
Voltage or Current Balance Relay
Term
61
 Definition
Density Switch or Sensor
Term
62
 Definition
Time-Delay Stopping or Opening Relay
Term
63
 Definition
Pressure Switch Detector
Term
64
 Definition
Ground Protective Relay
Term
65
 Definition
Governor
Term
66
 Definition
Notching or Jogging Device/Maximum Starting Rate/Starts Per Hour/Time Between Starts
Term
67
 Definition
Ac Directional Overcurrent Relay
Term
68
 Definition
Blocking Relay / Power Swing Blocking
Term
69
 Definition
Permissive Control Device
Term
70
 Definition
Rheostat
Term
71
 Definition
Liquid Switch
Term
72
 Definition
DC Circuit Breaker
Term
73
 Definition
Load-Resistor Contactor
Term
74
 Definition
Alarm Relay
Term
75
 Definition
Position Changing Mechanism
Term
76
 Definition
DC Overcurrent Relay
Term
77
 Definition
Telemetering Device
Term
78
 Definition
Phase Angle Measuring or Out-of-Step Protective Relay
Term
79
 Definition
AC Reclosing Relay / Auto Reclose
Term
80
 Definition
Liquid or Gas Flow Relay
Term
81
 Definition
Frequency Relay
Term
82
 Definition
DC Reclosing Relay
Term
83
 Definition
Automatic Selective Control or Transfer Relay
Term
84
 Definition
Operating Mechanism
Term
85
 Definition
Carrier or Pilot-Wire Receiver Relay
Term
86
 Definition
Lock Out Relay
Term
87
 Definition
Differential Protective Relay
Term
88
 Definition
Auxiliary Motor or Motor Generator
Term
89
 Definition
Line Switch
Term
90
 Definition
Regulating Device
Term
91
 Definition
Voltage Directional Relay
Term
92
 Definition
Voltage And Power Directional Relay
Term
93
 Definition
Field-Changing Contactor
Term
94
 Definition
Tripping or Trip-Free Relay
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