Description
2.7 Basic unit
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
33
2.7.3
Withdrawable breaker
The withdrawable version of the circuit breaker is not permanently mounted in the control
panel. Instead a guide frame holding the circuit breaker is mounted in the control panel. The
busbars and cables are connected to this guide frame. When the circuit breaker is inserted
into the guide frame, the main circuit connection is established. In the retracted position,
built-in shutters ensure safe touch protection of the main circuit connections.
In this way, the circuit breaker can be removed from the guide frame without disassembly
work and removed from the control panel if required.
The withdrawable breaker has the following advantages:
●
Fast replacement of the circuit breaker for maintenance and service
●
Simple establishment of visible galvanic disconnection in the main circuit
●
Testing of the auxiliary circuits while the main circuit is open