Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
360 Manual, 03/2019, A5E03603177010-03
Locking and interlocking
4.7.1
With all types of 3VA molded case circuit breaker, a basic distinction is made between:
● Locking of molded case circuit breakers
● Interlocking of molded case circuit breakers
Padlock devices can be used to lock 3VA molded case circuit breakers in the OFF (O) or ON
(I) position. A molded case circuit breaker cannot be operated when it is locked.
Locking a molded case circuit breaker in the OFF (O) position
In order to prevent closure of a 3VA molded case circuit breaker, it can be locked in the OFF
(O) position by a padlock. Once it is locked, the 3VA molded case circuit breaker is safely
locked in the OFF (O) position. It can be unlocked again only by an authorized person.
The padlock devices for locking the 3VA molded case circuit breaker in the OFF (O) position
ensure safe separation of the main contacts as defined by IEC 60947-2.
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