Abstract: The invention discloses a circuit protection device with self fault detection function. The ground fault protection unit comprises a ground fault detection circuit, an AC power supply path and an electromagnetic drive circuit. The self fault detection unit comprises an automatic detection circuit and a control circuit. The control circuit starts periodically a self fault detection process, controls the automatic detection circuit to generate a ground fault current GFC to the ground fault protection unit, and detects the fault status signal from the electromagnetic drive circuit. Based on the fault status signal, operation situations of the ground fault protection unit can be determined. If a fault occurs, an emergency interruption signal is generated, and that activates the electromagnetic drive circuit to make the ground fault protection unit trip in emergency, and cut off the AC power supply on load and socket terminals, and thus the emergency protection function is achieved.

Abstract: A circuit protection device includes a housing with a base and an upper cover, a clapboard, a circuit board, an AC power source path, a synchronous unit, a synchronous control switch, a tripping and resetting mechanism, a ground fault detection drive unit and a test and reset switch, to perform a function of ground fault protection, and to switch synchronously on or off the AC power path. The device has a manual mechanical tripping and electrical reset function, ensuring that the AC power supply connecting to the load circuit is switched off when the device has malfunctioned or the load circuit has failed, and preventing the device from being reset in case that the circuit protection device is not energized, or the circuit protection device has failed, or the AC power supply is reversely connected with load terminals.