MS1 series moulded case circuit breaker ( here below as breaker ) is suitable for AC 50HZ ( or 60HA), rated insulation voltage 800V, rated working voltage 690V and below, DC 250V and below, rated current of 12.5A-1600A circuit, is used for distributing electric energy. Making non-frequent closing&breaking in the normal condition, and doing the protection when the circuit and equipment are oveload, short circuit or lacking voltage. The breaker cpmplies with the standard of IEC60947-1、IEC60947-2、GB14048.2 etc.