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Circuit breaker having serial data communications

  • US 5,185,705 A
  • Filed: 02/10/1992
  • Issued: 02/09/1993
  • Est. Priority Date: 03/31/1988
  • Status: Expired due to Term
First Claim
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1. An improved circuit breaker system having a circuit breaker for interrupting electric current flow through at least one conductor from a source of electric energy to a load, the system comprising:

  • means for measuring current flow in said at least one conductor;

    microprocessor means, responsive to said means for measuring current flow, for calculating at least one quantity from said measured current flow, and said microprocessor means including means for comparing said at least one quantity with at least one predetermined limit value, and including means for disconnecting said load from said source by tripping the circuit breaker in the event that said at least one quantity differs from said at least one predetermined limit value by at least a predetermined differencerating plug means for establishing tripping characteristics of said circuit breaker system;

    means for said microprocessor means to digitally rad said rating plug means in order to determine said tripping characteristics of said circuit breaker system; and

    an optionally connectable keypad/display unit having coupling means for electrically coupling the keypad/display unit to the microprocessor means, and having at least one key which is manually engaged by an operator and having means, responsive to said at least one key, for displaying at least one of the tripping characteristics of the circuit breaker system.

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