Circuit breaker improvement to prevent setting of trip assembly

Details Circuit breaker improvement to prevent setting of trip assembly Circuit breaker improvement to prevent setting of trip assembly

1984-12-21

1986-10-07

Hartary, Joseph W.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 21, 335 23, 335 46, H01H 7312, H01H 7700, H01H 8100, H01H 8300

Patent

active

046161996

ABSTRACT:
An improvement to prevent alteration of the circuit breaker calibration due to high overloads. A circuit breaker has a U-shaped current path with a brazed junction at the bend of the "U". Upon the occurrence of a large overload, the opposing current in the two legs of the U-shaped path will force the two legs of the "U" apart, possibly weakening the brazed junction. When one of the legs is a closely calibrated component of a trip assembly, the breaker will no longer operate within the proper range. A stop is placed within the housing to prevent the two legs from moving apart such a distance as will cause the brazed junction to fail.

REFERENCES:
patent: 2902560 (1959-09-01), Stanback et al.
patent: 3073926 (1963-01-01), Ellsworth et al.
patent: 3467920 (1969-09-01), Hall et al.
patent: 4479101 (1984-10-01), Checinski
patent: 4503408 (1985-03-01), Mrenna et al.

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