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TRIP UNIT HAVING IMPROVED TRIP ADJUSTMENT INDICATOR AND CIRCUIT BREAKER INCORPORATING SAME

  • US 3,831,120 A
  • Filed: 11/08/1973
  • Issued: 08/20/1974
  • Est. Priority Date: 11/08/1973
  • Status: Expired due to Term
First Claim
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1. An over-current trip unit for use in a molded case circuit breaker, said trip unit comprising, in combination:

  • A. a housing;

    B. means forming an aperture in said housing;

    C. a tubular member secured on one end to said housing about said aperture, the other end of said member extending into an opening in the circuit breaker case when said trip unit is operatively positioned therein;

    D. means forming an array of trip adjustment scale graduations on said tubular member adjacent said other end, said graduations being visible externally of the circuit breaker case;

    E. an adjustment shaft rotatably mounted in said housing and having an end portion extending coaxially within said tubular member;

    F. means carried by said end portion facilitating manual rotation of said adjustment shaft; and

    G. pointer means carried by said shaft and working to said adjustment scale graduations to indicate the various trip settings of said trip unit.

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