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Leakage current detection and interruption circuit powered by leakage current

  • US 8,659,857 B2
  • Filed: 07/23/2009
  • Issued: 02/25/2014
  • Est. Priority Date: 07/24/2008
  • Status: Expired due to Fees
First Claim
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1. A circuit for disconnecting a power source upon the detection of a leakage current from one of a first and a second wire connected to the power source, comprising:

  • a sensing conductor located adjacent to one of the first and second wires for sensing a leakage current from one of the first and second wires;

    a disconnect switch interposed within the first and second wires connected to the power source;

    said disconnect switch having a disconnect switch solenoid coil for opening said disconnect switch;

    a threshold conduction device being conductive upon a threshold voltage applied to the threshold conduction device;

    a connector connecting said disconnect switch solenoid coil in series with said threshold conduction device between one of the first and second wires and said sensing conductor; and

    a threshold voltage generator comprising a capacitor connected in series with a diode between said sensing conductor and one of the first and second wires for charging said capacitor for generating said threshold voltage for said threshold conduction device upon a leakage current flow between said sensing conductor and one of the first and second wires and through said threshold voltage generator.

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