Patent ID: 8736279

Claim:
An electric leakage detection protective circuit connected with an outlet which has a test button, a reset button, an electromagnetic lock mechanism, a power output plug jack having a live wire output plug bush and a neutral wire output plug bush, the circuit comprising: a permanent magnet; an induction coil for detecting leakage current; a self-energizing coil for detecting low resistance fault; a control chip; a silicon controlled rectifier; a first rectifier diode and a second rectifier diode; a resistor; a filter capacitor; a trip coil with a magnetic core inside; a power output terminal having a power live wire output terminal with a live wire and a power neutral wire output terminal with a neutral wire; a first main circuit switch and a second main circuit switch, each interlocked with the reset button; a switch interlocked with at least the reset button; and a first normally closed switch and a second normally closed switch, each controlled by the electromagnetic lock mechanism in the outlet, wherein the live wire of the power output terminal is selectively connected to the live wire output plug bush of the power output plug jack via the first normally closed switch to constitute a group of live wire conductors at a power output side, wherein the neutral wire of the power output terminal is selectively connected to the neutral wire output plug bush of the power output plug jack via a second normally closed switch to constitute a group of neutral wire conductors at the power output side, wherein the permanent magnet is located above or below the magnetic core in the trip coil, wherein the permanent magnet is aligned in line with the magnetic core in the trip coil, wherein the permanent magnet is mounted a predetermined distance from the magnetic core in the trip coil so that when there is no current in the trip coil, the magnetic core in the trip coil will not be drawn by the permanent magnet, wherein, when the reset button is at a trip position, the power live wire output terminal is connected to the live wire output plug bush of the power output plug jack, wherein, when the reset button is at a reset position, the power live wire output terminal is connected to the live wire output plug bush of the power output plug jack, wherein, when the reset button is at a trip position, the power neutral wire output terminal is connected to the neutral wire output plug bush of the power output plug jack, and wherein, when the reset button is at reset position, the power neutral wire output terminal is connected to the neutral wire output plug bush of the power output plug jack.