Relay Device Numbers Flashcards
1
Master Element
2
Time Delay Starting or Closing Relay ( Just a Timer )
4
Master Contactor
8
Control Power Disconnecting Device
21
Distance Relay
23
Temperature Control Device
25
Synchronizing or Synchronism-Check Device
26
Apparatus Thermal Device
27
Under voltage Relay
30
Annunciator Relay
32
Directional Power Relay
43
Manual Transfer or Selector Switch
50
Instantaneous Overcurrent
51
AC Inverse Time Overcurrent Relay
52
AC Circuit Breaker
59
Over voltage Relay
62
Time- Delay Stopping or Opening Relay (Another Timer)
63
Pressure Switch
67
AC Directional Over Current Relay
69
Permissive Control Device
74
Alarm Relay
79
AC-Reclosing Relay
81
Frequency Relay
83
Automatic Selective Control or Transfer Relay
85
Pilot Communications, Carrier or Pilot Wire Relay
86
Lockout Relay
87
Differential Protective Relay
94
Tripping or Trip-Free Relay
