Patent ID: 8213139

Claim:
A leakage current protection plug comprising: a plug housing; a power supply cord; two copper legs embedded within the plug housing; a leakage current protection device; wherein the two copper legs are connected to a socket housing fixedly at a front part of a socket; wherein the leakage current protection device comprises two main moving contacts, a reset button, a winding assemble, an iron core, a circuit board, a ZCT (Zero Current Transformer), and a test switch device; wherein ends of the two main moving contacts are arranged to conduct respectively with the two copper legs upon contact between the two main moving contacts and the two copper legs; wherein the two main moving contacts are disposed within the plug housing corresponding to the two copper legs and are connected with the power supply cord fixedly; wherein the reset button is connected with the plug housing freely within an area defined by the plug housing; wherein the reset button has a connection position and an open position respectively at two ends of a sliding area; wherein a first end of the reset button is arranged with a push-out spring for pressing the reset button at the open position under a spring force; wherein the winding assemble is fixedly connected to the plug housing; wherein the iron core is interposed into a winding assemble hole, coordinates with the winding assemble, and stands generally perpendicular to the reset button; wherein a spring is arranged within the winding assemble hole for bouncing the iron core outwards; wherein a L plate is fabricated at an outer end of the iron core; wherein the circuit board and the ZCT are embraced within the plug housing; wherein an amplification circuit is arranged on the circuit board; wherein the power supply cord is connected to the two main moving contacts through the ZCT disposed at a lower end of the plug housing; wherein an output of the ZCT is connected with an input of the amplification circuit on the circuit board; wherein an output of the amplification circuit is connected with the winding assemble; wherein the test switch device comprises a test switch spring and a test switch button; wherein a first end of the test switch spring is fixed to an end of the test switch button; wherein the test switch spring is a spiral conductive metal spring; wherein the first end of the test switch spring, fixed to the end of the test switch button, forms a bottom end metal of the test switch spring and extends outwards to form a U-shape contact; wherein the bottom end metal of the test switch spring comes into contact and bounces with a first conductive contact on the circuit board correspondingly; wherein the U-shape contact corresponds to a second conductive contact on the circuit board; and wherein the first conductive contact and the second conductive contact are connected respectively to an L end and an N end of a test circuit.