Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with UL and IEC certification
314 Manual, 01/2019, L1V30435333-01
Interlocking of molded case circuit breakers
Risk of interlock defeat. Use of more than one key poses safety hazard.
Leave a key inserted in only one of the circuit breakers in the interlock arrangement.
Store all other keys in a safe place or lock them away.
In order to ensure reliable functioning of the interlock, only 1 key is left in one circuit breaker
included in the interlock arrangement. This one key serves as the release instrument for only
one molded case circuit breaker at a time.
1. Bring all 3VA UL molded case circuit breakers of the interlock arrangement to the OFF
position and lock them (cylinder lock in vertical "locked" position).
2. Remove all keys.
All 3VA UL molded case circuit breakers of the interlock arrangement are now securely
locked in the OFF (O) position and cannot be actuated.
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