IEEE/ANSI Device Numbers

16

Data Communications Device

21

Distance Relay

25

Synchronizing or Synchronism-Check Device

27

Undervoltage Relay

33

Position Switch

43

Manual Transfer or Selector Device

48

Incomplete Sequence Relay

50

Instantaneous Overcurrent Relay

51

AC Time Overcurrent Relay

52

AC Circuit Breaker

59

Overvoltage Relay

62

Timer Relay (Time-Delay Stopping or Opening Relay)

63

Gas Pressure Relay

64

Ground Protective Relay

67

AC Directional Overcurrent Relay

69

Permissive Control Device

74

Alarm Relay

77

Pulse Transmitter (Transfer Trip Relay)

79

AC Reclosing Relay

81

Frequency Relay

85

Carrier or Pilot-Wire Receiver Relay (BLOCK)

86

Lockout Relay

87

Differential Protective Relay

89

Line Disconnect Switch

94

Trip Relay

97

High Resistance Open PHASE (HIROP)