1 - Master Element
2 - Time-delay Starting or Closing Relay
3 - Checking or Interlocking Relay, complete Sequence
4 - Master Protective
5 - Stopping Device, Emergency Stop Switch
6 - Starting Circuit Breaker
7 - Rate of Change Relay
8 - Control Power Disconnecting Device
9 - Reversing Device
10 - Unit Sequence Switch
11 - Multifunction 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 ( Solenoid Valve )
21 - Distance Relay
21G - Ground Distance
21P - Phase Distance
22 – Equalizer circuit breaker
23 – Temperature control device, Heater
24 – Volts per hertz relay
25 – Synchronizing or synchronism-check device
26 – Apparatus thermal device, Temperature Switch
27 – Undervoltage relay
27P - Phase Undervoltage
27S - DC undervoltage relay
27TN - Third Harmonic Neutral Undervoltage
27TN/59N - 100% Stator Earth Fault
27X - Auxiliary Undervoltage
27 AUX - Undervoltage Auxiliary Input
27/27X - Bus/Line Undervoltage
27/50 - Accidental Generator Energization
28 - Flame Detector
29 - Isolating Contactor
30 - Annunciator Relay
31 - Separate Excitation Device
32 - Directional Power Relay
32L - Low Forward Power
32H - High Directional Power
32N - Watt metric Zero-Sequence Directional
32P - Directional Power
32R - Reverse Power
33 - Position Switch
34 - Master Sequence Device
35 - Brush-Operating or Slip-ring Short Circuiting Device
36 - Polarity or Polarizing Voltage Device
37 - Undercurrent or Underpower Relay
37P - Underpower
38 - Bearing Protective Device / Bearing Rtd
39 - Mechanical Condition Monitor ( Vibration )
40 - Field Relay / Loss of Excitation
41 - Field Circuit Breaker
42 - Running Circuit Breaker
43 - Manual Transfer or Selector Device
44 - Unit Sequence Starting Relay
45 - Fire Detector
46 - Reverse-Phase or Phase Balance Current Relay or Stator Current Unbalance
47 - Phase-Sequence or Phase Balance Voltage Relay
48 - Incomplete Sequence Relay / Blocked Rotor
49 - Machine or Transformer Thermal Relay / Thermal Overload
49RTD - RTD Biased Thermal Overload
50 - Instantaneous Overcurrent Relay
50BF - Breaker Failure
50DD - Current Disturbance Detector
50EF - End Fault Protection
50G - Ground Instantaneous Overcurrent
50IG - Isolated Ground Instantaneous Overcurrent
50LR - Acceleration Time
50N - Neutral Instantaneous Overcurrent
50NBF - Neutral Instantaneous Breaker Failure
50P - Phase Instantaneous Overcurrent
50SG - Sensitive Ground Instantaneous Overcurrent
50SP - Split Phase Instantaneous Current
50Q - Negative Sequence Instantaneous Overcurrent
50/27 - Accidental Energization
50/51 - Instantaneous / Time-delay Overcurrent relay
50Ns/51Ns - Sensitive earth-fault protection
50/74 - Ct Trouble
50/87 - Instantaneous Differential
51 - AC Time Overcurrent Relay
51G - Ground Time Overcurrent
51LR - AC inverse time overcurrent (locked rotor) protection relay
51N - Neutral Time Overcurrent
51P - Phase Time Overcurrent
51R - Locked / Stalled Rotor
51V - Voltage Restrained Time Overcurrent
51Q - Negative Sequence Time Overcurrent
52 – AC circuit breaker
52a - AC circuit breaker position (contact open when circuit breaker open)
52b - AC circuit breaker position (contact closed when circuit breaker open)
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
59B - Bank Phase Overvoltage
59P - Phase Overvoltage
59N - Neutral Overvoltage
59NU - Neutral Voltage Unbalance
59P - Phase Overvoltage
59X - Auxiliary Overvoltage
59Q - Negative Sequence Overvoltage
60 - Voltage or Current Balance Relay
60N - Neutral Current Unbalance
60P - Phase Current Unbalance
61 - Density Switch or Sensor
62 - Time-Delay Stopping or Opening Relay
63 - Pressure Switch Detector
64 - Ground Protective Relay
64F - Field Ground Protection
64R – Rotor earth fault
64REF – Restricted earth fault differential
64S – Stator earth fault
64S - Sub-harmonic Stator Ground Protection
64TN - 100% Stator Ground
65 - Governor
66 - Notching or Jogging Device/Maximum Starting Rate/Starts Per Hour/Time Between Starts
67 - AC Directional Overcurrent Relay
67G - Ground Directional Overcurrent
67N - Neutral Directional Overcurrent
67Ns – Earth fault directional
67P - Phase Directional Overcurrent
67SG - Sensitive Ground Directional Overcurrent
67Q - Negative Sequence Directional Overcurrent
68 - Blocking Relay / Power Swing Blocking
69 - Permissive Control Device
70 - Rheostat
71 - Liquid Switch, Level Switch
72 - DC Circuit Breaker
73 - Load-Resistor Contactor
74 - Alarm Relay
75 - Position Changing Mechanism
76 - DC Overcurrent Relay
77 - Telemetering Device, Speed Sensor
78 - Phase Angle Measuring or Out-of-Step Protective Relay
78V - Loss of Mains
79 - AC Reclosing Relay / Auto Reclose
80 - Liquid or Gas Flow Relay
81 - Frequency Relay
81O - Over Frequency
81R - Rate-of-Change Frequency
81U - Under Frequency
82 - DC Reclosing Relay
83 - Automatic Selective Control or Transfer Relay
84 - Operating Mechanism
85 - Pilot Communications, Carrier or Pilot-Wire Relay
86 - Lock-Out Relay, Master Trip Relay
87 - Differential Protective Relay
87B - Bus Differential
87G - Generator Differential
87GT - Generator/Transformer Differential
87L - Segregated Line Current Differential
87LG - Ground Line Current Differential
87M - Motor Differential
87O - Overall Differential
87PC - Phase Comparison
87RGF - Restricted Ground Fault
87S - Stator Differential
87S - Percent Differential
87T - Transformer Differential
87V - Voltage Differential
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 – Transmitter
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
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