DW16 Series Air Circuit Breaker (hereinafter referred to as breaker), mainly for the exchange of 50Hz, rated current 100A to 4000A, rated voltage 400V or 690V power distribution networks used to distribute electric power, protection circuit and power devices from over contains, under voltage, short circuit fault hazards under normal conditions, as lines are not used frequently change. Rated current of 100A to 630A circuit breaker can also exchange 50Hz, 380V electric motor is used to protect the network overload, under voltage and short circuit. Can serve as a transformer neutral grounding of TN distribution system and metallic single-phase to ground short circuit protection. Products meet the GB 14048.2, GB 14048.4 and IEC 60947-2, IEC 60947-4 standard.