ANSI standard Device Numbers and Acronyms

ANSI standard Device Numbers and Acronyms, for Intelligent Electronic Device - IED Protection Relays / microprocessor based controllers / Numeric relay.
ANSI / IEEE C37.2 defines the standard device numbers for Protection provided by Intelligent Electronic Device – IED Protection Relays / microprocessor based controllers / Numeric Relay / Circuit Breaker.

In a SLD – single line diagram, ANSI devie code numbers are used to identify protections given by Relay/IED.

ANSI
Device
Number		ANSI
Device
Description
ANSI# 1Master Element
ANSI# 2Time Delay Starting or Closing Relay
ANSI# 3Checking or Interlocking Realy
ANSI# 4Master Contactor
ANSI# 5Stopping Device
ANSI# 6Starting Circuit Breaker
ANSI# 7Rate of Change Relay
ANSI# 8Control Power Disconnecting Device
ANSI# 9Reversing Device
ANSI# 10Unit Sequence Switch
ANSI# 11Multifunction Device
ANSI# 12Overspeed Protection
ANSI# 13Synchronous-Speed Device
ANSI# 14Underspeed Device
ANSI# 15Speed or Frequency Matching Device
ANSI# 16Communication Networking Device
ANSI# 17Shunting or Discharge Switch
ANSI# 18Accelerating or Decelerating Device
ANSI# 19Motor Starter / Starting-to-Running Transition Contactor
ANSI# 20Electrically-Operated Valve
ANSI# 21Distance Relay
ANSI# 21GGround Distance
ANSI# 21PPhase Distance
ANSI# 22Equalizer Circuit Breaker
ANSI# 23Temperature Control Device
ANSI# 24Volts-per-Hertz Relay / Overfluxing
ANSI# 25Synchronizing or Synchronism-Check Device
ANSI# 26Apparatus Thermal Device
ANSI# 27Undervoltage Relay
ANSI# 27PPhase Undervoltage
ANSI# 27TNThird Harmonic Neutral Undervoltage
ANSI# 27XAuxiliary Undervoltage
ANSI# 27AUXUndervoltage Auxiliary Input
ANSI# 28Flame Detector
ANSI# 29Isolating Contactor
ANSI# 30Annunciator Relay
ANSI# 31Separate Excitation Device
ANSI# 32Directional Power Relay
ANSI# 32LLow Forward Power
ANSI# 32NWattmetric Zero-Sequence Directional
ANSI# 32PDirectional Power
ANSI# 32RReverse Power
ANSI# 33Position Switch
ANSI# 34Master Sequence Device
ANSI standard Device Numbers and Acronyms
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