DW45 Series Intelligent low-voltage vacuum circuit breaker (hereinafter referred to as breaker) is mainly applied to AC 50Hz, rated voltage 400V, 690V and 1140V, rated current 630A to 1600A in the distribution network, distribution of electrical energy used to protect the line, to prevent power supply suffered overload, under voltage, short circuit and single phase to ground fault and other hazards. Under normal conditions, can also be converted as the lines are not frequently used. Circuit breaker with the core components of intelligent release, with the precise selective protection to avoid unnecessary power outages, increase the reliability. The most prominent feature is the circuit breaker vacuum interrupter in the process of breaking current does not arc ejected, and therefore particularly suitable in the coal mine, chemical industry, metallurgy and other harsh environmental conditions place. Products meet the standards of GB 14048.2 and IEC 60947-2.