Interlocking - Siemens 3VA1 100 A Manual

Accessories
4.7 Locking and interlocking
Locking a molded case circuit breaker in the ON (I) position
It is also possible to safely lock a 3VA molded case circuit breaker in the ON (I) position
using a padlock device. The breaker contacts cannot be opened when it is locked in this
position. A 3VA molded case circuit breaker can be released from its ON position again only
by an authorized person.
The TRIP function, i.e. the protective functionality of the 3VA molded case circuit breaker, is
not affected by locking the breaker in the ON (I) position. In the event of a fault, the 3VA
molded case circuit breaker trips in the normal way.
4.7.1.2

Interlocking

The available interlocking devices can be used to implement a mutual interlock between at
least two 3VA molded case circuit breakers.
The interlocking device only ever releases one 3VA molded case circuit breaker at a time,
thereby ensuring that only the released circuit breaker can be operated. All other 3VA
molded case circuit breakers remain in the safe OFF (O) position and are blocked by the
interlock.
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3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02