Molded case circuit breaker with movable lower electrical contac

Details Molded case circuit breaker with movable lower electrical contac Molded case circuit breaker with movable lower electrical contac

1983-12-19

1985-11-19

Shepperd, John W.

Electricity: circuit makers and breakers

Electric switch details

Contact

200245, H01H 124

Patent

active

045544271

ABSTRACT:
A molded case circuit breaker includes a movable lower electrical contact having a formed stationary member, a movable contact arm, a pair of electrical contact compression springs, a contact arm compression spring and a contact secured to the upper end of the movable contact arm for physically and electrically contacting a separable upper electrical contact. An integral longitudinal end portion of the stationary member extends through the base of the cirucit breaker to form an external terminal of the circuit breaker. The opposite longitudinal end of the stationary member is curved for receiving a rotatable pin fixedly secured to the movable contact arm for rotation therewith. The rotatable pin is biased by the pair of compression springs into effective current conducting contact with the curved end of the stationary member. The contact arm compression spring contacts the underside of the movable contact arm to bias the contact secured thereto into engagement with the upper electrical contact. Upon the occurrence of a high level short circuit or fault current condition, the movable contact arm rotates against the force of the contact arm compression spring to achieve rapid separation of the upper and lower electrical contacts.

REFERENCES:
patent: 1512235 (1924-10-01), Perry
patent: 1807815 (1931-06-01), White
patent: 2238383 (1941-04-01), Collins
patent: 2615109 (1952-10-01), Favre
patent: 3158720 (1964-11-01), Wiktor
patent: 3293397 (1966-12-01), Zubaty et al.
patent: 4245203 (1981-07-01), Wafer et al.

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