The SFset circuit breaker has an integrated and independent protection system
The SFset circuit breaker comprises an SF1 into which is integrated a protection system comprising:
• a set of current sensors installed on the lower current terminals of the pole units.
• Two interchangeable sensors,CSa4 and CSb4, sufficient to cover all requirements from 0 A to 630 A
• a VIP type protection relay mounted on the control unit.
• a “Mitop” low consumption, release unit installed on the switching device.
• The unit is fully independent and functions without an auxiliary power supply.


Operating principle:
The protection system is supplied power by sensors which supply:
• the “current” information, processed by the protection unit
• the electrical power required for the whole protection system to operate ;
VIP unit and Mitop release.
All settings are visible and accessible from the front of the device.

Released for:Schneider Electric South Africa