Rack-mounted circuit breaker - has balancing weights distributing mass of changeover linkage

摘要

An assembly installation locking device comprises a lockable contact system and a locking arrangement rotatable about an axle (5) which is driven when a release criterion is satisfied and opens the contact system lock with a release lever (6). The mass of the locking arrangement is, by positioning of a counter weight (10), arranged to be distributed so that the centre of mass of the rotatable arrangement is shifted close to the centre of the axle (5). ADVANTAGE - Better distribution of mass about axle improves disconnection reliability and speed.