Current limiting circuit breaker with integral magnetic drive de

Details Current limiting circuit breaker with integral magnetic drive de Current limiting circuit breaker with integral magnetic drive de

1978-10-16

1980-09-02

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335195, H01H 7710

Patent

active

042209340

ABSTRACT:
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 between open and closed positions, and a slotted magnetic drive device generating electrodynamic force on the contact arm during extreme overcurrent conditions to rapidly separate the contacts. The magnetic drive device includes a molded housing forming a slot having insulated walls disposed about the contact arm, and a stack of U-shaped laminations 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 extending through the lamination stack. The housing also includes molded recesses for receiving a compression spring to produce 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.

REFERENCES:
patent: 3815059 (1974-06-01), Spoelman
patent: 4056798 (1977-11-01), Malick
patent: 4077025 (1978-02-01), Slade et al.

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