1
Q
Over current instantaneous
A
50
2
Q
Over current Time
A
51
3
Q
Ac circuit breaker
A
52
4
Q
Over voltage relay
A
59
5
Q
Voltage or current balance relay
A
60
6
Q
Under voltage relay
A
27
7
Q
Distance relay
A
21
8
Q
Directional power relay
A
32
9
Q
Lockout relay
A
86
10
Q
Frequency relay
A
81
11
Q
Tripping or trip free relay
A
94
12
Q
Thermal relay
A
49
13
Q
Bus is
A
B
14
Q
Field is
A
F
15
Q
Ground or generator
A
g
16
Q
Neutral
A
N
17
Q
Transformer
A
T
18
Q
50n
A
Instantaneous neutral
19
Q
50 g
A
Rate of rise ground
20
Q
Running circuit breaker
A
42
21
Q
Manual transfer selector switch
A
43
22
Q
V squared/ r
A
P
23
Q
R times I squared
A
P
24
Q
2* seconds *frequency/ number of poles
A
Synchronous speed
25
R times I
V
Ansi Device Numbers
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