A ground faulty interrupting function is returned to a normal standby state in a short time after a movable contact (8) tripped in detecting electrical leak is returned to a closed position. A tripping coil (10) which moves the contact (8) provided on an output line (2) to a shutdown position is included. A current transformer (12) is provided on a downstream of the contact (8). A circuit (20) energizes the coil (10) when the leak current are detected. A reset signal forming circuit (22) outputs a reset signal to the gate signal forming circuit (20) when the contact (8) is returned to a connection position. The circuit (20) obtains power from the upstream side of the contact (8). LED (16) is lit when the contact (8) is at the shutdown position, and LED (16) end display when the contact (8) is returned to the normal position.