1
Q
2
A
Time Delay Relay
2
Q
6
A
Starting Circuit Breaker
3
Q
21
A
Distance Relay
4
Q
25
A
Sync Check Relay
5
Q
29
A
Isolating Contactor
6
Q
32
A
Directional Power
7
Q
27
A
Undervoltage Relay
8
Q
40
A
Field Relay, Loss of Field
9
Q
41
A
Field Circuit Breaker
10
Q
42
A
Running Circuit Breaker (starter, contactor)
11
Q
43
A
Manual Transfer (Control Switch)
12
Q
46
A
Reverse or Phase Balance
13
Q
47
A
Phase Sequence Relay
14
Q
49
A
Thermal Overload Relay, Temperature switch
15
Q
50
A
Instantaneous Overcurrent Relay
16
Q
51
A
Time Overcurrent Relay
17
Q
52
A
AC Circuit Breaker
18
Q
59
A
Undervoltage Relay
19
Q
60
A
Voltage Balance Relay
20
Q
61
A
Current Balance Relay
21
Q
62
A
Time Delay Stop or Open
22
Q
63
A
Pressure Relay
23
Q
64
A
Ground Protective Relay
24
Q
65
A
Governor
25
66
Directional Overcurrent
26
67N
Directional Ground Relay
27
70
Rheostat
28
72
DC Circuit Breaker
29
74
Alarm Relay
30
78
Out of Step Relay
31
81
Frequency Relay
32
85
Pilot Wire Receiver Relay
33
86
Lockout Relay
34
87
Differential Relay
35
94
Tripping or Trip Free Relay
36
95
Ground Current Annunciator Relay
37
71
Level Switch
38
52Y
Anti-pump Relay
39
What is the function of the 52Y device?
The Anti-Pump Relay prevents a breaker close when a trip signal is present
40
52X
Close coil or Spring Release Coil
41
What is the function of the 52X device?
It electrically closes the breaker by releasing the close latch.
42
52ST
Shunt Trip Coil
43
What is the function of the 52ST device?
It electrically trips the breaker
44
What is the function of the PS1 device in a 12kV Cutler Hammer breaker?
Position Switch 1 initiates anti-pump relay (52Y) to prevent breaker operation during breaker rack in.
45
What is the function of the PS2 device in a 12kV Cutler Hammer breaker?
Position Switch 2 prevents closing springs from charging during a breaker rack in.
46
What is the function of the LS1/bb device in a 12kV Cutler Hammer breaker?
The Limit Switch 1 contact opens when closing springs are fully charged to stop the motor.
47
What is the function of the LS2/aa device in a 12kV Cutler Hammer breaker?
The Limit Switch 2 NO contact remains open to prevent breaker from closing until springs are fully charged.
48
What is the function of the LS2/bb device in a 12kV Cutler Hammer breaker?
The Limit Switch 2 NC contact initiates the anti-pump relay (52Y) until closing springs are fully charged.
Electrical Maintenance
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