Title: Multi-pole circuit breaker with adjustable thermal trip unit

Abstract: A multi-pole circuit breaker with adjustable thermal trip unit characterized by a circuit breaker mechanism having a plurality of pole units, means releasable when released from a latched position to effect simultaneous opening of the circuit breaker contacts, a multi-pole trip device including trip means for each of said pole units, each of said trip means being constructed to operate upon the occurrence of certain current conditions to effect release of said releasable means, and each pole unit comprising a bimetal element responsive to current flow to effect heating thereof. The circuit breaker also comprises a first trip bar and a second trip bar, the first trip bar being mounted to pivot between latched and unlatched positions and being biased in the latched position, the second trip bar being pivotally mounted on the first trip bar and being pivotally adjustable to varying spacings from the bimetal elements, and an adjusting cam mounted on the first trip bar and engageable with the second trip bar for adjusting the second trip bar with respect to the bimetal elements.

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Inventors: Cellerini, Albert R. (Beaver Falls, PA, US)
Ricci, Louis N. (Beaver Falls, PA, US)

Application Number: 551937
Filing Date: 1975-02-21
Publication_date: 1976-04-13
Assignee: Westinghouse Electric Corporation (Pittsburgh, PA)
Primary Class(es): 335/45 335/176, 337/82
Other Classes:
US Patent Ref:

3211861	Oct, 1965	Freese	337/82.
3240903	Mar, 1966	Groves et al.	337/82.
3345591	Oct, 1967	Leonard et al.	335/23.
3758887	Sep, 1973	Ellsworth et al.	335/42.
3775713	Nov, 1973	Walker et al.	335/45.

Other Refs:
Primary Examiner: Harris, G.
Assistant Examiner:
Attorney: Johns; L. P.