DWl7 series circuit breaker (hereinafter referred to as breaker) is suitable for AC 50Hz, rated voltage 400V, 690V, rated current 630A to 4000A in the distribution network, for distribution of electricity, the protection circuit and power devices (such as generators, rectifiers, etc.) from overload, short circuit and under voltage fault hazards, and selective protection. 630A circuit breaker used to protect motor overload, short circuit and under voltage. Products meet the GB 14048.2, GB 14048.4 and IEC 60947-2, IEC 60947-4 standard.