Device List

Question 1

2

Answer 1

Time Delay Relay

Question 2

6

Answer 2

Starting Circuit Breaker

Question 3

21

Answer 3

Distance Relay

Question 4

25

Answer 4

Sync Check Relay

Question 5

29

Answer 5

Isolating Contactor

Question 6

32

Answer 6

Directional Power

Question 7

27

Answer 7

Undervoltage Relay

Question 8

40

Answer 8

Field Relay, Loss of Field

Question 9

41

Answer 9

Field Circuit Breaker

Question 10

42

Answer 10

Running Circuit Breaker (starter, contactor)

Question 11

43

Answer 11

Manual Transfer (Control Switch)

Question 12

46

Answer 12

Reverse or Phase Balance

Question 13

47

Answer 13

Phase Sequence Relay

Question 14

49

Answer 14

Thermal Overload Relay, Temperature switch

Question 15

50

Answer 15

Instantaneous Overcurrent Relay

Question 16

51

Answer 16

Time Overcurrent Relay

Question 17

52

Answer 17

AC Circuit Breaker

Question 18

59

Answer 18

Undervoltage Relay

Question 19

60

Answer 19

Voltage Balance Relay

Question 20

61

Answer 20

Current Balance Relay

Question 21

62

Answer 21

Time Delay Stop or Open

Question 22

63

Answer 22

Pressure Relay

Question 23

64

Answer 23

Ground Protective Relay

Question 24

65

Answer 24

Governor

Question 25

66

Answer 25

Directional Overcurrent

Question 26

67N

Answer 26

Directional Ground Relay

Question 27

70

Answer 27

Rheostat

Question 28

72

Answer 28

DC Circuit Breaker

Question 29

74

Answer 29

Alarm Relay

Question 30

78

Answer 30

Out of Step Relay

Question 31

81

Answer 31

Frequency Relay

Question 32

85

Answer 32

Pilot Wire Receiver Relay

Question 33

86

Answer 33

Lockout Relay

Question 34

87

Answer 34

Differential Relay

Question 35

94

Answer 35

Tripping or Trip Free Relay

Question 36

95

Answer 36

Ground Current Annunciator Relay

Question 37

71

Answer 37

Level Switch

Question 38

52Y

Answer 38

Anti-pump Relay

Question 39

What is the function of the 52Y device?

Answer 39

The Anti-Pump Relay prevents a breaker close when a trip signal is present

Question 40

52X

Answer 40

Close coil or Spring Release Coil

Question 41

What is the function of the 52X device?

Answer 41

It electrically closes the breaker by releasing the close latch.

Question 42

52ST

Answer 42

Shunt Trip Coil

Question 43

What is the function of the 52ST device?

Answer 43

It electrically trips the breaker

Question 44

What is the function of the PS1 device in a 12kV Cutler Hammer breaker?

Answer 44

Position Switch 1 initiates anti-pump relay (52Y) to prevent breaker operation during breaker rack in.

Question 45

What is the function of the PS2 device in a 12kV Cutler Hammer breaker?

Answer 45

Position Switch 2 prevents closing springs from charging during a breaker rack in.

Question 46

What is the function of the LS1/bb device in a 12kV Cutler Hammer breaker?

Answer 46

The Limit Switch 1 contact opens when closing springs are fully charged to stop the motor.

Question 47

What is the function of the LS2/aa device in a 12kV Cutler Hammer breaker?

Answer 47

The Limit Switch 2 NO contact remains open to prevent breaker from closing until springs are fully charged.

Question 48

What is the function of the LS2/bb device in a 12kV Cutler Hammer breaker?

Answer 48

The Limit Switch 2 NC contact initiates the anti-pump relay (52Y) until closing springs are fully charged.