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Fault indicator having electrostatically-actuated indicator flag

  • US 5,153,565 A
  • Filed: 08/10/1988
  • Issued: 10/06/1992
  • Est. Priority Date: 08/10/1988
  • Status: Expired due to Term
First Claim
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1. A fault indicator for indicating the occurrence of a fault current in an electrical conductor, comprising, in combination:

  • a housing;

    an indicator flag mounted in said housing for movement between a fault-indicating position and a reset-indicating position;

    electrostatic actuator means including at least an actuator electrode positioned for exerting an electrostatic force on said indicator flag;

    circuit means electrically connected to said actuator electrode for establishing an electric field between said actuator electrode and said indicator flag to exert an electrostatic force on said indicator flag to position said indicator flag to a selected one of said indicating positions;

    biasing means comprising a permanent magnet for positioning said indicator flag to the other of said indicating positions in the absence of said electric field; and

    said circuit means being responsive to the occurrence of a fault current in the electrical conductor to position said indicator flag to said fault-indicating position.

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