DZ47LE, C45LE RCBO(residual current circuit breaker with over current protection) is ussed for the protection against electrical leakage in the circuit of 50Hz or 60Hz, rated voltage 1 phase 230V and 3 phase 400V, rated current up to 63A. When somebody gets and electric shock or the residual current of the circuit exceeds the fixed value, the RCBO can cut off the power within the time of 0.1s automatically to protect the personal safety and preventing the equipment for the fault resulted by the residual current. With this function, the RCBO can protect the circuit against overload and short circuit of can be used for the unfrequent switchover of the circuit under normal conditions. It conforms to IEC61009 standard.