MCCB-1250S series moulded case circuit breaker (hereinafter referred to as circuit breaker)is suitable for circuit of AC 50HZ or 60HZ,rated current 16A~630A,insulatin voltage 750V,rated operating vltage 690V below,mainly used for low voltage distribution network to distribute energy and protect circuit and power device against overload,short circuit ,under voltage,grounding fault and so on.By means of giving the special setting for release,it can be used as starting protection circuit breaker of motor. Conform to standard GB14048.2.