Improved calibration means for a circuit breaker

Details Improved calibration means for a circuit breaker Improved calibration means for a circuit breaker

1996-08-23

1998-10-13

Gellner, Michael L.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 6, 335 16, 335 42, 335 45, 335 68, 335 71, 335 77, H01H 7512

Patent

active

058218394

ABSTRACT:
A circuit breaker device for interrupting current in a circuit path between a source and a load includes a first contact and a second contact cooperatively arranged in the circuit path so as to provide current from a source to a load. A trip mechanism assembly, which includes an armature, a bimetal and a yoke, is provided for interrupting the current. The armature includes an aperture in which a latch point is provided to engage a latching surface of a trip lever for latching the trip lever thereon. The amount of current that is required to cause the trip mechanism to interrupt the circuit path is determined by the amount of overlap between the latching surface and the latch point. This overlap is adjusted by bending a calibration plate by tightening a calibration screw which extends through an aperture in a circuit breaker housing and a slotted aperture in the calibration plate. A substantially square shaped nut secures the calibration screw tightly against the housing. The calibration plate includes a leg portion bent substantially perpendicular thereto which has a rounded end supported in a v-block formed in the housing. The rounded end provides a pivot for which the calibration plate rotates thereabout. The slotted aperture allows the calibration plate to slide horizontally and bend as the calibration screw is tightened into the square nut.

REFERENCES:
patent: 3950714 (1976-04-01), Mrenna et al.
patent: 4630019 (1986-12-01), Maier et al.
patent: 5180051 (1993-01-01), Cook et al.
patent: 5532660 (1996-07-01), Smith et al.

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