Circuit breaker with improved trip mechanism

Details Circuit breaker with improved trip mechanism Circuit breaker with improved trip mechanism

1976-09-15

1978-03-21

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 45, H01H 7512

Patent

active

040805824

ABSTRACT:
A single-pole circuit breaker or a plural-pole circuit breaker of the type having a common trip bar extending between poles whereby any pole tripping acts therethrough to trip the other pole or poles. The breaker is provided with an improved trip mechanism comprising a subassembly for each pole wherein all of the thermal and magnetic trip elements are mounted on a breaker terminal plate that acts as a base therefor and which is secured to the breaker housing. This trip mechanism also comprises shunt contacts mounted on the armature and bimetal for closing a protective shunt across the bimetal on magnetic trip and for rocking action on shunt contacts due to bimetal movement to break any welds therebetween; a field test mechanism having a spring-biased rotary trip member accessible from the outside and an eccentric lever attached thereto for manually tripping the breaker for test purposes; and an insulator lining the lower surface of the contact finger to prevent the arc from re-striking below the contact when the contacts trip open thereby to enhance completion of the tripping action.

REFERENCES:
patent: 2654008 (1953-09-01), Toth et al.
patent: 2952757 (1960-09-01), Ellenberger
patent: 2989605 (1961-06-01), Leonard
patent: 2989606 (1961-06-01), Walker et al.
patent: 3046371 (1962-07-01), Jencks
patent: 3072763 (1963-01-01), Goodwin, Jr.
patent: 3188416 (1965-06-01), Schultz
patent: 3480890 (1969-11-01), Layton et al.
patent: 3585541 (1971-06-01), Erickson
patent: 3849751 (1974-11-01), Link et al.

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