Accessories
4.7 Locking and interlocking
3VA molded case circuit breakers with IEC certificate
372 Manual, 03/2019, A5E03603177010-03
Interlocking of molded case circuit breakers
Use of more than one key poses safety hazard and/or risk of damage to property
Only leave one key in the entire interlock arrangement.
Store all other keys in a safe place or lock them away.
In order to ensure reliable functioning of the interlock, only one must remain in the entire
interlock arrangement. This one key serves as the release instrument for only one molded
case circuit breaker at a time.
1. Move all 3VA molded case circuit breakers in the interlock arrangement to the OFF
position and lock them (turn the cylinder lock to the horizontal "locked" position).
2. Remove all keys.
All 3VA molded case circuit breakers in the interlock arrangement are now safely locked
in the OFF (O) position and cannot be operated.
3. Insert
key in one circuit breaker included in the interlock; store or lock away
keys.
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