Siemens vacuum circuit breaker 38-3AH3 38 kV - Manual (Page 29)

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WITHDRAWN position.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