Locking

The S 750 (DR) is provided with an integrated locking tab which

makes it possible to block the all poles simultaneously. The

integrated locking tab locks the circuit-breaker in ON or

OFF position and can be additionally protected by a pad

lock, wire seal or cable tie. When locked in ON position, the

protective function is maintained in case of a fault: The

blocked switch handle still permits the tripping of the me

chanism and opening of the contacts in case of overload

or short-circuit (trip-free mechanism). The indicator shows

“green” also in case of a fault with ON position locked –

giving you the certainty that power is switched off.

Furthermore ABB offers the auxiliary contact for

the S 750 DR range. S 750 DR-AUX is a two

change-over contact that indicates the contact

position of the S 750 DR pole(s) independently

and potential-free. This helps to easily monitor individual circuits