Siemens SENTRON 3VA1 - Front Interlocking; Cylinder Locks for Implementing Interlocks between Multiple 3 VA Molded Case Circuit Breakers

Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
369
4.7.3
Front interlocking
Front interlocks are installed on the front panel of the 3VA molded case circuit breaker.
The following interlocking devices are available for 3VA molded case circuit breakers:
● Cylinder locks for implementing interlocks between an unlimited number of molded case
circuit breakers
● Sliding bar with Bowden cable
● Sliding bar
4.7.3.1
Cylinder locks for implementing interlocks between multiple 3VA molded case circuit
breakers
Cylinder locks (type Ronis) can be installed in the accessory compartments not only to lock
molded case circuit breakers, see chapter Cylinder locks for locking the 3VA molded case
circuit breaker (Page 365), but also to implement mutual interlocks between an unlimited
number of 3VA molded case circuit breakers. The purpose of this system is to ensure that
only one single 3VA molded case circuit breaker included in the interlock application can be
in the ON (I) position at any given time.
In order to implement a mutual interlock between multiple 3VA molded case circuit breakers,
the following two components must be ordered for each circuit breaker to be included in the
interlock arrangement:
● One cylinder lock (type Ronis)
One lock and two keys are always included in the order.
Note
It is important to order the same lock number for all circuit breakers to be included in the
interlock arrangement!