Accessories
3.3 Control and signaling accessories
3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
61
3.3.2 Closing coil, shunt trip and undervoltage release
Closing coil (CC)
The closing coil makes remote closing of the circuit breaker possible. The prerequisite for this
is the ready-to-close status of the circuit breaker.
Remote closing can take place by means of electrical signals on the secondary disconnect
terminal system.
The closing coil is available in one version:
• Closing coil for continuous duty (100% OP)
This version is suitable for continuous duty with an ON period (OP) of 100%.
The closing coil has no effect on the service life, operating cycles or operating frequency of
the circuit breaker.
It can be retrofit.
Shunt trip (ST)
Up to two shunt trips make remote opening of the circuit breaker possible.
Remote opening can take place by means of electrical signals on the secondary disconnect
terminal system.
The shunt trips are available in one version:
• Shunt trip for continuous duty (100% OP)
This version is suitable for continuous duty with an ON period (OP) of 100%.
– The release can be permanently connected to voltage.
– It locks out on momentary-contact commands, thus making it possible to set up
interlocks.
The shunt trips have no effect on the service life, operating cycles or operating frequency of
the circuit breaker.
Shunt trip ST and the undervoltage releases are mounted in the same location
③. It is not
possible to use these accessories simultaneously.
The shunt trips can be retrofit.
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