Circuit breaker with low voltage contact structure
AssigneeWestinghouse Electric Corp.
InventorsNorman Davies, Walter V. Bratkowski, Daun Bhasavanich
Life of this patent
Estimating the term…
Abstract
A circuit breaker characterized by first and second main contacts and first and second arcing contacts. The first main and arcing contacts are mounted on a first contact carrying arm. The second arcing contacts are mounted on a second contact carrying arm. The second main contacts are mounted on a third contact arm. The first contact carrying arm is mounted on a first pivot and the second and third contact carrying arms are mounted on a second pivot. A spring for biasing the second main contact against the first main contact and in the closed position. A second spring for biasing the second arcing contact against the first arcing contact until after the first and second main contact separate.
Claims5
A circuit breaker comprising:
- a circuit breaker structure including first and second main contacts and first and second arcing contacts;
- the first and second contacts being movable between open and closed positions;
- an operating releasable mechanism for releasably opening the contacts;
- a first contact arm carrying the first contacts and pivotally mounted at a first pivot;
- a second contact arm carrying the second arcing contact and pivotally mounted at a second pivot;
- a third contact arm carrying the second main contact and pivotally mounted at the second pivot;
- a trip structure for latching the releasable mechanism in the closed contact position and for releasing the mechanism;
- bias means for yieldingly retaining the main contacts closed below a predetermined overcurrent rating,
- the bias means operating during opening motion of the second contact arm for successively closing the arcing contacts, opening the main contacts, and then opening the arcing contacts.
Dependencies are inferred from the claim text.