Torsion spring for contact pressure

Details Torsion spring for contact pressure Torsion spring for contact pressure

1976-04-28

1978-05-02

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 8, H01H 7702

Patent

active

040877698

ABSTRACT:
A multipole circuit breaker is constructed with a single rod pivotally mounting all of the movable contact arms to a common one piece molded insulating carrier. Individual torsion springs engage each of the contact arms to provide contact pressure when the circuit breaker is closed. The construction of the contact arms and carrier are such that under severe overcurrent conditions electrodynamic blowoff forces acting on the contact arms may bring about contact separation that is substantially as great as the contact separation that takes place when the circuit breaker is opened normally by its contact operating mechanism.

REFERENCES:
patent: 3192344 (1965-06-01), Cole
patent: 3646488 (1972-02-01), Iida

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