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Appendix 2: ANSI standard device function numbers
Device number Function Device number Function
Master element Master sequence device
Time-delay relay Blush operating or slip-ring short-circuiting
device
Checking or interlocking relay
Polarity or polarizing voltage device
Master contactor
Undercurrent under power relay (low forward
Stopping device power relay)
Starting circuit breaker Bearing protective device
Anode circuit breaker Mechanical condition monitor
Control power disconnecting device Field relay or loss of excitation relay
Keversing device Field circuit breaker
Unit sequence switch Circuit breaker, contactor, or starter
Reserved for future application Manual transfer selector device or local/remote
selector switch
Overspeed device
Unit sequence starting relay
Synchronous speed device
Atmospheric condition monitor
Underspeed device
Reverse phase or negative sequence relay
Speed frequency matching device
Phase sequence voltage relay
Reserved for future application
Incomplete sequence relay
Shunt or discharge switch
Thermal overload relay
Accelerating or decelerating device
Instantaneous overcurrent relay
Starting to running transition contactor
Definite time delay overcurrent relay
Electrically operated valve
Instantaneous ground fault relay
Distance relay
Inverse time overcurrent relay
Equalizer circuit breaker
Inverse time ground fault relay
Temperature control device
Inverse time generator ground fault relay
Reserved for future application
Voltage controlled overcurrent relay
Synchronizing check relay
Guard relay IDMT with instantaneous overcurrent relay
Undervoltage relay
A.C. circuit breaker
Flame detector Exciter or D.C. generator relay
Isolating contactor Reserved for future application
Annunciator relay Power factor relay
Separate excitation device Field application relay
Directional reverse power relay Short-circuiting or grounding device
Position relay Rectification failure relay
