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SM3 series moulded case circuit breaker its applicable circuit of AC 50/60Hz,rated insula-ton volage 690V(AM3-125 500V),rated operating voltage AC 690V or below .rated operating current 12.5-1600A, for distribute energy of electric and infrequent making and breaking circuit in normal condition. The circuit-breakers are provided with the function of the protection against overload and short circuit and under-voltage. The circuit breakers comply with standard of IEC60947-2 The circuit-breaikers are double insulating (Inm-250A or above), the controldrcul of the accessories is set apart with the main circuit,and doesn't need to open the cover of the circuit breaker when install the accessories.