H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/284
H01H 71/52 (2006.01)
Patent
CA 1282444
ABSTRACT OF THE DISCLOSURE A molded case circuit breaker includes a highly integrated operating mechanism having an over- center, trip-free, pivot transfer toggle mechanism for opening and closing a pair of electrical contacts in response to overload and short circuit or fault current conditions. The toggle mechanism includes a pair of stationary, spaced apart links and a pair of movable, spaced apart toggle links. Each of the mov- able links includes an integrally formed, first or initial pivot point formed along its surface for en- gagement with a surface of one of the stationary links. Each of the stationary links includes a second pivot point formed along its surface for en- gagement by a surface of one of the movable links. The movable links are sequentially pivotably movable during a trip operation of the circuit breaker ini- tially about the first pivot points and subsequently about the second pivot points. The movement of the movable links about the first pivot points effect a rapid separation of the electrical contacts at the beginning of the trip operation. The movement of the movable links about the second pivot points effect a rapid acceleration of a movable electrical contact during a subsequent portion of the trip operation to increase the arc voltage and thus rapidly extinguish any electrical arc between the electrical contacts.
513305
Changle Joseph Frank
Tedesco Robert Joseph
Riches Mckenzie & Herbert Llp
Westinghouse Electric Corporation
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