Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
321
Possible combinations of handle positions
In the case of a sliding bar for two 3VA UL molded case circuit breakers locked with
padlocks, the following handle positions are possible:
In the case of a sliding bar for three 3VA UL molded case circuit breakers locked with
padlocks, the following handle positions are possible:
Installation of other accessories
The installation of the front sliding bar partly excludes the installation of other accessory
components, e.g. front mounted accessories such as manual and motor operators as well as
cylinder locks. In addition, the front interlock must be removed to gain access to the
accessory compartment for the internal accessories.
4.7.4
Rear interlock
Rear interlock
The rear interlock allows an an interlock of two 3VA UL molded case circuit breakers without
restricting the installation of accessories 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.
Modification of the panel mounting plate may be required.
