Stacked circuit breakers having high interrupting capacity

Details Stacked circuit breakers having high interrupting capacity Stacked circuit breakers having high interrupting capacity

1975-12-19

1978-02-07

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335195, H01H 7500

Patent

active

040729168

ABSTRACT:
A multipole molded case circuit breaker of moderately high rating is constructed of a stack of single pole units each having a contact operating mechanism and a trip unit. The movable contact arm is so positioned that it is subjected to magnetic blow-off effect, which even at relatively low fault levels, tend to open the contacts to enduce a current limiting action. A conducting strap within each pole unit housing is connected to the line terminal and is provided with a plurality of spaced connecting points each accessible through a different opening at the rear of the housing for connection to a panelboard bus bar.

REFERENCES:
patent: 3469216 (1969-09-01), Shiraishi
patent: 3593227 (1971-07-01), Mitskevich et al.
patent: 3646488 (1972-02-01), Iida et al.

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