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Circuit breaker responsive to repeated in-rush currents produced by a sputtering arc fault

  • US 6,057,997 A
  • Filed: 06/03/1999
  • Issued: 05/02/2000
  • Est. Priority Date: 02/26/1993
  • Status: Expired due to Term
First Claim
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1. A circuit breaker for protecting an ac electrical system, said circuit breaker comprising:

  • a housing;

    a set of contacts mounted in said housing;

    an electrical conductor connected to said electrical system and to said set of contacts and through which current of said ac electrical system flows;

    a current sensor connected across a selected portion of said electrical conductor and utilizing resistivity of said selected portion of said electrical conductor to detect said current flowing through said set of contacts;

    trip means connected to said current sensor and generating a trip signal in response to predetermined conditions of said current; and

    means opening said set of contacts to interrupt said current flowing in the ac electrical system in response to said trip signal.

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