Molded case circuit breaker with movable lower electrical...

H - Electricity – 01 – H

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306/283, 306/60

H01H 77/10 (2006.01) H01H 1/58 (2006.01)

Patent

CA 1225688

39 51,209 ABSTRACT OF THE DISCLOSURE A molded case circuit breaker includes a movable lower electrical contact having a formed sta- tionary 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 circuit breaker to form an external terminal of the circuit breaker. The opposite longitudinal end of the stationary member is curved for receiving a ro- tatable pin fixedly secured to the movable contact arm for rotation therewith. The rotatable pin is biased by the pair of compression springs into ef- fective current conducting contact with the curved end of the stationary member. The contact arm com- pression 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.

469800

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