Current limiting circuit breaker with integral magnetic...

Details Current limiting circuit breaker with integral magnetic... Current limiting circuit breaker with integral magnetic...

H - Electricity

01

H

306/56

H01H 73/36 (2006.01) H01H 50/16 (2006.01) H01H 77/10 (2006.01)

Patent

CA 1116210

16 48,152 ABSTRACT OF THE DISCLOSURE A current limiting circuit interrupter comprises a molded case, separable contacts disposed in the case, the contact arms supporting one of the contacts, an operating mechanism connected to the contact arm to move the arm be- tween open and closed positions, and a slotted magnetic drive device generating electrodynamic force on the contact arm during extreme overcurrent conditions to rapidly separ- ate the contacts. The magnetic drive device includes a molded housing forming a slot having insulated walls dis- posed about the contact arm, and a stack of U-shaped lamina- tions of magnetic material fitted into the housing. The space between opposing walls of the housing is slightly less than the thickness of the lamination stack so that the laminations may be snugly press-fitted into the housing. The housing is then secured to the case in such a manner that the laminations are captured and securely positioned without the need for rivets or other fastening means extend- ing through the lamination stack. The housing also includes molded recesses for receiving a compression spring to pro- duce contact force when the contacts are in the closed position, and a molded stop member to limit the movement of the contact arm when the breaker is in the open position.

335617

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