Electric circuit breakers having fast short circuit response

Details Electric circuit breakers having fast short circuit response Electric circuit breakers having fast short circuit response

1983-03-28

1984-11-13

Goldberg, E. A.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Contact-actuating means

335192, 335 16, 200244, H01H 300

Patent

active

044828772

ABSTRACT:
A thermal magnetic circuit interrupter with instantaneous short circuit current response utilizes a hook-shaped contact arm pivotally mounted on the operating mechanism at the end of the contact arm most distant from the contact. A saddle-type torsion spring proximate the pivot end of the contact arm provides adequate contact pressure while allowing the contact to immediately respond to magnetic forces generated under short circuit conditions. The immediate separation of the contacts reduces the current let-through the operating mechanisms while the tripping mechanism operates to trip the breaker.

REFERENCES:
patent: 3492609 (1970-01-01), Murai et al.
patent: 3646488 (1972-02-01), Iida et al.
patent: 4144513 (1979-03-01), Shaffer et al.

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