Patent ID: 8760849

Claim:
An electrical protection circuit, comprising: a circuit board comprising electrical connections and further comprising: an induction coil for detecting a leakage current; a self-exciting coil for detecting a low-resistance fault; a control chip; a silicon controlled rectifier; a rectifier diode; a resistor; a filtration capacitor; a trip coil with integrated iron core; at least one group of main circuit switches; a reset button linked with the main circuit switches; and an analog electric single-pole double-throw switch linked with the reset button, the switch comprising: a traveling contact lever; a first static contact jaw; and a second static contact jaw, wherein the circuit is configured such that, when the reset button is in a tripped state, the traveling contact lever is connected with the second static contact jaw and the switch is in a closed state, wherein the circuit is configured such that, when the reset button is pressed down, the traveling contact lever disconnects from the second static contact jaw and the traveling contact lever contacts the first static contact jaw, whereupon the traveling contact lever disconnects from the first static contact jaw and returns to the closed state with the second static contact jaw, and wherein the circuit is configured such that, when the reset button is in a reset state, the traveling contact lever is connected with the second static contact jaw and the switch is in a closed state.