Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
379
Possible combinations of handle positions
When a sliding bar interlock between
3VA molded case circuit breakers is locked by
padlocks, the following combinations of sliding bar position are possible:
When a sliding bar interlock between
3VA molded case circuit breakers is locked by
padlocks, the following combinations of handle position are possible:
Installation of other accessories
When the front handle blocking device is fitted, some other accessories cannot be installed,
see chapter Possible combinations of of accessories (Page 186).
Rear interlock
Rear interlock
The rear interlock system is capable of creating an interlock between two 3VA molded case
circuit breakers and does not restrict the number of accessories which can be assembled on
the front panel of the molded case circuit breaker.
The rear interlock operates according to the following principle: When one molded case
circuit breaker is closed, the other circuit breaker is prevented from closing by a tappet which
engages in the breaker mechanism directly from the rear panel of the molded case circuit
breaker.
The rear interlock is provided by two interlocking modules which are attached at the rear of
the molded case circuit breakers and behind the mounting plate. The two interlocking
modules are interconnected by means of the interlocking rod.
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