Trip delay override for electrical circuit breakers

  • US 4,949,214 A
  • Filed: 08/28/1989
  • Issued: 08/14/1990
  • Est. Priority Date: 08/28/1989
  • Status: Expired due to Term
First Claim
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1. A protector circuit for automatically overriding the trip delay of a circuit breaker of the type having a movable contact arm for making and breaking an electrical circuit in a power distribution system having first and second power conductors, said protector circuit comprising, in combination:

  • current to voltage transforming means having an input adapted to be coupled to a selected one of said power conductors for producing a control voltage output signal having a magnitude proportional to the magnitude of current conducted through said selected power conductor;

    a control solenoid having an actuator linkage member movably coupled to the movable contact arm of the circuit breaker and having an armature winding electrically coupled to conduct current from the first power conductor to the second power conductor; and

    ,a gate controlled switch having switched and unswitched power terminals connected in series electrical relation with the armature winding of said control solenoid, said switch having a control gate terminal electrically coupled to said transforming means for receiving the control voltage output signal.

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