ANSI CODES for protection devices
List of Device Numbers and Acronyms
1 - Master Element
2 - Time Delay Starting or Closing Relay
3 - Checking or Interlocking Relay
4 - Master Contactor
5 - Stopping Device
6 - Starting Circuit Breaker
7 - Rate of Change Relay
8 - Control Power Disconnecting Device
9 - Reversing Device
10 - Unit Sequence Switch
11 - Multi-function Device
12 - Overspeed Device
13 - Synchronous-speed Device
14 - Under speed Device
15 - Speed - or Frequency, Matching Device
16 - Data Communications Device
17 - Shunting or Discharge Switch
18 - Accelerating or Decelerating Device
19 - Starting to Running Transition Contactor
20 - Electrically Operated Valve
21 - Distance Relay
22 - Equalizer Circuit Breaker
23 - Temperature Control Device
24 - Over Fluxing Relay
25 - Synchronizing or Synchronism-Check Device
25A - Automatic Synchronizing relay
26 - Apparatus Thermal Device
27 - Under-voltage Relay
27P- Phase UV relay
27N/27G - Neutral/Ground UV relay
27A - Aux. UV relay
28 - Flame Detector
29 - Isolating Contactor or Switch
30 - Annunciator Relay
31 - Separate Excitation Device
32 - Directional Power Relay
32R- Reverse Power Relay
32F - Low Forward Power Relay
33 - Position Switch
34 - Master Sequence Device
35 - Brush-Operating or Slip-Ring Short-Circuiting Device
36 - Polarity or Polarizing Voltage Devices
37 - Undercurrent or Under-power Relay
38 - Bearing Protective Device
39 - Mechanical Condition Monitor
40 - Loss of field (Field Failure or Loss of Excitation).
41 - Field Circuit Breaker
42 - Running Circuit Breaker
43 - Manual Transfer or Selector Device
44 - Unit Sequence Starting Relay
45 - Abnormal Atmospheric Condition Monitor
46 - Reverse-phase or Phase-Balance Current Relay
47 - Phase-Sequence or Phase-Balance Voltage Relay
48 - Incomplete Sequence Relay
49 - Machine or Transformer, Thermal Relay
50 - Instantaneous Overcurrent Relay AFD - Arc Flash Detector
51 - AC Inverse Time Overcurrent Relay
52- AC Circuit Breaker
53 - Exciter or DC Generator Relay
54 - Turning Gear Engaging Device
55 - Power Factor Relay
56 - Field Application Relay
57 - Short-Circuiting or Grounding Device
58 - Rectification Failure Relay
59 - Overvoltage Relay
60 - Voltage or Current Balance Relay
61 - Density Switch or Sensor
62 - Time-Delay Stopping or Opening Relay
63 - Pressure Switch
64 - Ground Detector Relay
65 - Governor
66 - Notching or Jogging Device
67 - AC Directional Overcurrent Relay
68 - Blocking or "Out-of-Step" Relay
69 - Permissive Control Device
70 - Rheostat
71 - Liquid Level Switch
72 - DC Circuit Breaker
73 - Load-Resistor Contactor
74 - Alarm Relay
75 - Position Changing Mechanism
76 - DC Overcurrent Relay
77 - Telemetering Device
78 - Phase-Angle Measuring 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 - Communications, Carrier or Pilot-Wire Relay
86 - Lockout Relay
87 - Differential Protective Relay
88 - Auxiliary Motor or Motor Generator
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
95 - For specific applications where other numbers are not suitable
96 - For specific applications where other numbers are not suitable
97 - For specific applications where other numbers are not suitable
98 - For specific applications where other numbers are not suitable
99 - For specific applications where other numbers are not suitable
DFR - Digital Fault Recorder
CLK - Clock or
Timing Source
ENV - Environmental Data
DDR - Dynamic Disturbance Recorder
HIZ - High Impedance Fault Detector
PDC -
Phasor Data Concentrator
HMI - Human Machine Interface
PMU - Phasor
Measurement Unit
HST – Historian
PQM - Power Quality Monitor
LGC - Scheme Logic
RIO - Remote
Input/Output Device
MET - Substation Metering
RTU - Remote
Terminal Unit/Data Concentrator
SER - Sequence of Events Recorder
TCM - Trip Circuit Monitor
SOTF - Switch On To
Fault
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