Effective arc stack/efficient contact carrier

Details Effective arc stack/efficient contact carrier Effective arc stack/efficient contact carrier

1990-09-13

1992-05-05

Scott, J. R.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200147R, 200147B, H01H 3310, H01H 3318

Patent

active

051110083

ABSTRACT:
A circuit breaker (51) includes an arc stack of metal plates (52), each of which is disposed parallel to the movement of the contact arm (12), whereby lug strikes which may pass through the vent holes (32) in the housing (16) to the lug (18) are avoided. The arrangement of the metal plates (52) provides protection from such unintended lug strikes without requiring the use of additional parts (e.g., barriers, insulators, and deflectors). A contact arm (12) is provided that is light in mass, but which is still strong enough to resist bending caused by the contact blow off loop forces which occur during fault conditions. Contact arms (12) which have I-beam construction, as well as hollow cylindrical and hollow polygonal construction are capable of carrying currents found in intermediate range circuit breakers; however, they are lighter in mass than solid contact arms and thereby enable faster contact separation and reduced arcing currents.

REFERENCES:
patent: 2242905 (1941-05-01), Dickinson et al.
patent: 3248505 (1966-04-01), Mayer
patent: 3997746 (1976-12-01), Harper et al.
patent: 4072916 (1978-02-01), Kussy
patent: 4158827 (1979-06-01), Bratkowski et al.
patent: 4532391 (1985-07-01), Bernt
patent: 4620074 (1986-10-01), Paul et al.
patent: 4654490 (1987-03-01), Leone et al.

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