DW15 Series Air Circuit Breaker (hereinafter referred to as breaker), the circuit breaker is mainly used for AC 50Hz, rated current 100A ~ 4000A; rated voltage from 380V to 1140V (which rated current of 1000A ~ 4000A of the rated voltage of 380V ) power distribution networks used to distribute electric power, protection circuits and power supply equipment against overload, under voltage and short circuit fault hazards. Shell frame current 630A and below the specifications can be used to protect the motor overload, under voltage and short circuit. Under normal conditions, the circuit breaker can be used as line frequency converter and motor is not starting is not used frequently. As the circuit breaker also has protection features three sections that can be selectively protected on the grid. The drawer-type circuit breaker, as the primary circuit and secondary circuit with a plug-type structure, omitting the isolation needed for fixed circuit breaker switch. Have a machine with two features, easy operation and maintenance, improved power distribution system security, continuity and reliability. Products meet the GB 14048.2, GB 14048.4 and IEC 60947-2, IEC 60947-4 standard.