A leakage current detection and interruption device coupled to power supply lines, including a leakage current detection module for generating a leakage current fault signal when detecting leakage currents on the lines; a trip drive module responsive to the leakage current fault signal to drive a switch to disconnect power on the lines, the trip drive module including a first semiconductor device responsive to the leakage current fault signal to cause a current in a first coil to drive the switch; a coil function detection module for generating a coil fault signal when detecting a fault in the first coil; a self-test module for generating a self-test fault signal when detecting a fault in the leakage current detection module or the first semiconductor device; and a detection drive module for driving the switch to disconnect power in response to the coil fault signal or the self-test fault signal.