Molded case circuit breaker interlock arrangement

Details Molded case circuit breaker interlock arrangement Molded case circuit breaker interlock arrangement

1988-06-13

1989-05-02

Scott, J. R.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

H01H 926

Patent

active

048270890

ABSTRACT:
Molded case circuit breakers connected to two different sources of power within an industrial application are interlocked to prevent one circuit breaker from being turned on while the other circuit breaker is already on. The circuit breakers include a molded plastic crossbar arranged for rotation within the circuit breaker enclosure. The interlock arrangement consists of a pivoted bell crank assembly including a pair of pivotally mounted insulative posts on either end of the bell crank. A corresponding cam integrally formed on the circuit breaker crossbar is in interference with one of the upstanding posts when the circuit breaker is in the "OFF" position and is out of interference with the upstanding post when the circuit breaker is in its "ON" condition.

REFERENCES:
patent: 3312797 (1967-04-01), Harrington et al.
patent: 3319020 (1967-05-01), Shaffer
patent: 3647997 (1972-03-01), Nerem
patent: 3705280 (1972-12-01), Harms
patent: 3710288 (1973-01-01), Grunert
patent: 3778633 (1973-12-01), DeVisser et al.
patent: 4286242 (1981-08-01), Mrenna et al.
patent: 4295053 (1981-10-01), Kovatch et al.
patent: 4295054 (1981-10-01), Kovatch et al.
patent: 4499344 (1985-02-01), Castonguay et al.
patent: 4733211 (1988-03-01), Castonguay et al.
patent: 4754247 (1988-06-01), Raymont et al.
Ser. No. 061,244 entitled "Molded Case Circuit Breaker Accessory Enclosure", Raymont et al., filed 6/12/87.

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