Electrical circuit breakers

Details Electrical circuit breakers Electrical circuit breakers

1975-12-08

1977-05-10

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

335176, 337 57, H01H 7322

Patent

active

040231321

ABSTRACT:
An electric circuit breaker or overload protection apparatus includes a thermal element which, on being heated by a fault current, is deflected to initiate a circuit-breaking tripping of the apparatus. A supporting mechanism for varying the rating of the apparatus includes an adjusting member or slide displaceable relative to the thermal element so as to vary the action of the thermal element, a recessed manually-operable externally-accessible knob, and a rotatable boss eccentrically and adjustably mounted in the knob recess and operative upon knob rotation to cause a variance in the displacement of the adjusting member and thus a variance in the rating of the apparatus.

REFERENCES:
patent: 3084236 (1963-04-01), Klein et al.
patent: 3142187 (1964-07-01), Kane et al.
patent: 3211861 (1965-10-01), Freese
patent: 3226510 (1965-12-01), Thomas et al.
patent: 3317764 (1967-05-01), Dremel
patent: 3708771 (1973-01-01), Schreckenberg et al.
patent: 3775713 (1973-11-01), Walker et al.

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