Current limiting circuit breaker

Details Current limiting circuit breaker Current limiting circuit breaker

H - Electricity

01

H

306/93

H01H 73/36 (2006.01) H01H 9/34 (2006.01) H01H 71/02 (2006.01)

Patent

CA 1048578

ABSTRACT OF THE DISCLOSURE An electric circuit interrupting device comprising a molded case, a pair of separable contacts in the case, an elongated movable contact arm to carry one of said contacts, between a contact open and contact closed position, a magnetic core structure in the case substantially completely encircling the contacts and encircling a substantial current carrying portion of said elongated movable contact arm which extends rearwardly of said contacts, said magnetic core including a pair of spaced apart upright magnet walls, one of said magnet walls being on one side of said contacts and the other of said magnet walls being on the opposite side of said contacts, said walls extending upright in the same direction as the direction of contact separation, said walls being imperforate and unbroken defining a cavity therebetween a first unobstructed opening to said cavity defined by corresponding longitudinal edges of said pair of magnet walls, said first opening being spaced for- wardly of said contacts in a direction to provide an outlet toward which an arc and shock waves associated with such arc can move, a second opening to said cavity defined by corres- ponding longitudinal edges at the opposite end of said pair of magnet walls, said second opening being spaced rearwardly of said contacts a distance substantially equal to said portion of said elongated movable contact arm extending rearwardly of said contacts which is encircled by said magnetic core structure, said magnetic core thereby including a first forwardly extending cavity portion extending between said contacts and said first opening to provide a transverse magnetic field to coact with an arc for movement thereof from said contacts toward said first opening, and a second rearwardly extending cavity portion extending between said contacts and said second opening to provide a transverse magnetic field to coact with said current carrying portion of said elongated movable contact arm for movement thereof in a contact opening direction.

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