NS(MCCB,Circuit Breaker) series Mouded case circuit breaker is one new type breakers which this company adopts international advanced design,manufacture technology to develop,the rated insulating voltage is 750V,suitable for AC 50Hz(60Hz),rated working voltage 690V or below,rated working current is 12.5 to 1250Aof circuit and use in distributing electric energy.Non frequent making and breaking in the normal conditions and protecting when circuit and installation are overload ,shortcircuit nad under voltage .Rated shell-rack and the breaker which current is under 400A,take protect effect when mousecage motor is non frequent start, breaking off working and protecting overload,short circuit and under voltge.