High sensitivity leakage current detection interrupter

A leakage current detection interrupter (LCDI), comprising:

• a shielded wire having a live core and a neutral core, which are respectively wrapped in two conductive shell wires;
• a current leakage detection unit, comprising:
• a pair of rectifying diodes reversely coupled in series between a live line and a neutral line of a power supply, wherein anodes of the rectifying diodes are coupled together and cathodes of the rectifying diodes are respectively coupled to the live line and the neutral line;
• a voltage dropping resistor, wherein one end of the voltage dropping resistor is coupled to the anodes of the rectifying diodes, and the other end of the voltage dropping resistor is coupled to the conductive shell wires of the shielded wire;
• and
• at least two thyristors, wherein control electrodes of the at least two thyristors are respectively coupled to the cathodes of the rectifying diodes, cathodes of the at least two thyristors are respectively coupled to the live line and the neutral line, and resistor-capacitor (RC) voltage dropping filter circuits are coupled in parallel between the cathodes and the control electrodes;
• and
• a tripping mechanism, comprising control units with on/off respectively controlled by the at least two thyristors, wherein if one of the at least two thyristors is turned on, the corresponding control unit is turned on, and the tripping mechanism is actuated to switch off the power supply.