nf-cs series moulded case circuit breaker is a kind of economic breaker, has the features as following, such as steady and reliable property, reasonable structure, beautiful style, small volume,etc. this breaker applies to the circuit with ac50/60hz,rated insulation voltage 660v,max.rated current 1250a as on-off operation, and take effect, it also can be used as unfrequent conversion of line and unfrequency.