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Vacuum interrupter/ operator – Siemens vacuum circuit breaker 38-3AH3 38 kV User Manual

Page 29

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Vacuum interrupter/
operator

Figure 22: Typical elementary diagram

88.0 - Spring-charging motor

52a -

Auxiliary switch is open when circuit
breaker is open

52b -

Auxiliary switch is closed when circuit
breaker is closed

52SRC -

Spring-release coil (close)

52T - Shunt trip coil

52Y -

Closing relay (anti-pump)

G - Green indicating light (trip)

LS - Spring-charged switch

(+)

MI1, MI2 - Mechanical interlock

OI/C - Control switch (close)

OI/T - Control switch (trip)

R - Red indicating light (closed)

W -

White indicating light (spring-
charged).

Standard:

Fuses in close circuit. Slugs in trip circuit (fuses
optional).

Shown with springs DISCHARGED, trip-latch
reset, circuit breaker OPEN, CONNECT or
WITHDRAWN position.

(-)

DC supply

SD3

W

SD16

SD13

01
C

01
T

LS41

LS21

LS22

Motor

88

MI1

MI2

52b

SD15

TB

1

2

3

4

5

6

52Y

52Y

A1

52SRC

A2

LS9

13

14

21

22

21

22

22

21

41

42

22

21

31

32

13

14

22

21

SD11

SD9

SD7

SD5

54

55

64

63

52a

52a

SD12

91

92

101

102

52b

52b

SD10

74

73

84

83

52a

52a

SD8

111

112

121

122

52b

52b

SD6

G

R

LS3

21

22

52Y

14

13

A1

52Y

A2

SD4

52b

31

32

SD14

SD1

52a

24

23

A1

52T

A2

52a

34

33

SD2

29