Patent ID: 7692904

Claim:
A ground fault circuit interrupter for preventing an overload current from a power supply to a load, comprising: a first module supplying a unipolar ≡power supply; a second module obtaining a fault current in responsive to a hot wire and a neutral wire with a ground wire; a third module amplifying a signal of said fault current from said second module; a fourth module which comprises a programmable control module for determining said fault current, wherein when said programmable control module presets a preset threshold for said fault current to be compared; a fifth module comprising an End-of-life circuitry performing an automatic self-checking operation; a sixth module which comprises a control switch, a trip breaker, an armature, a locking device, a movable terminal, and a fixed terminal, wherein when said fault current is larger than said preset threshold, said programmable control module sends a control signal to said control switch such that said control switch electrifies a second coil of said trip breaker to drive an armature to actuate said locking device, so as to move said movable terminal away from said fixed terminal for electrically disconnecting said load with said power supply; and a seventh module comprising a reset circuitry for resetting said trip breaker and a test circuitry for checking a status of said trip breaker.