DPN circuit breaker is suitable to the single-phase residual circuit of AC50or60Hz, rated voltage 230V, protecting the circuit from overload and short circuit. The product has high breaking capacity, volume small are cut at the same time to avoid the inversed grafting of live and null wire or danger caused by the voltage between zero wire and earth. It is the ideal power distribution switch for the present residence. It conforms to standard IEC60898-1.