Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
303
Locking a molded case circuit breaker in the ON (I) position
Like the OFF (O) position, the ON (I) positions can also be secured with a padlock device in
order to secure the 3VA UL molded case circuit breaker against being opened. Only an
authorized person can remove the locking of the 3VA UL molded case circuit breaker in the
ON position again.
The TRIP function and thus the protection function of the 3VA UL molded case circuit
breaker is not impaired by locking in the ON (I) position. In the event of a fault, the 3VA UL
molded case circuit breaker trips in the normal way.
Two or more 3VA UL molded case circuit breakers can be mutually interlocked with the
padlock devices.
The padlock device releases only one 3VA UL molded case circuit breaker at a time, thereby
ensuring that only the released circuit breaker can be actuated. All other 3VA UL molded
case circuit breakers are in the safe OFF (O) position and are blocked by the interlocking
technology.
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