Relay Numbers Flashcards
1
Q
27
A
Undervoltage
2
Q
50
A
Instantaneous Overcurrent
3
Q
51
A
Time Overcurrent
4
Q
52
A
Circuit Breaker (a/b contacts)
5
Q
59
A
Overvoltage
6
Q
62
A
Time-Delay/Timer
7
Q
63
A
Pressure Device
8
Q
64
A
Ground Protective
9
Q
67
A
Directional Overcurrent
10
Q
81
A
Frequency
11
Q
86
A
Lock-out
12
Q
87
A
Differential
13
Q
89
A
Disconnect Switch (a/b contacts)
14
Q
43
A
Flexi’s/Switch
15
Q
30
A
Monitoring/Alarm/Annunciator
ANNUNCIATOR RELAY is non-automatically reset device which gives a number of separate visual indications upon the functioning of protective devices, and which may also be arranged to perform a lockout function.
