Locking And Interlocking; General Information; Locking - Siemens Sentron 3VA Manual

Accessories

4.7 Locking and interlocking

4.7 Locking and interlocking
4.7.1

General information

4.7.1.1 General information
For all 3VA UL molded case circuit breakers, a basic distinction is made between:
● Locking of molded case circuit breakers
● Interlocking of molded case circuit breakers
4.7.1.2

Locking

The padlock devices can be used to lock the 3VA UL molded case circuit breaker in the
OFF (O) position 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 the 3VA UL molded case circuit breaker from being closed, the position
OFF (O) can be secured with a padlock device. As a result of this locking, the 3VA UL
molded case circuit breaker is in the secure OFF (O) position. It can be unlocked again only
by an authorized person.
The padlock devices of the 3VA UL molded case circuit breaker in the OFF (O) position
ensure safe separation of the main contacts as defined by IEC 60947-2.
302
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01