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4.3.6 Shunt trip control circuit
Standard DC 24 V shunt trip with control PCB.
-X13: ST PCB
-X2
-S2
[6]
[4]
[7]
[3]
[5]
-K1
-X10/11
[6]
Closing
STOP relay
[ 7 ](-)
[8]
24 V DC
[ 9 ] (+)
-K1
[7]
ST coil
[ 10 ]
[9]
Cut-off
contact
[1]
-HS11
[2]
36/ _ _ _ X _ _ _
Key position - 5
Key number - 00: Without shunt trip or zero voltage release.
Key number - 10: With shunt trip.
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The closing STOP signal is provided for resetting K2 on the SU-control circuit. It effects with priority in switching OFF (by
ST or UVR) before switching ON. Once switching ON and OFF signals are simultaneous, switching OFF command will stay
longer than switching ON. It means, that OFF command is master command.
The shunt trip operates for short time period only. After main contacts open, switch HS 11 cuts off shunt trip coil.
Manual closing of the breaker, while –S2 contact is closed, leads to overheating of ST coil and will damage coil.
Fig. 27a ST control circuit
2009-09-02
S47183e rev.03
Design and specifications are subject to change without notice
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