Circuit breaker positive off interlock

Details Circuit breaker positive off interlock Circuit breaker positive off interlock

1990-04-03

1992-08-25

Recla, Henry J.

Electricity: circuit makers and breakers

Toggle mechanisms

200DIG42, H01H 2300

Patent

active

051421127

ABSTRACT:
A molded case circuit breaker includes an interlock which prevents the operating handle from being placed in the off position after the main contacts have been welded together. By preventing the operating handle from being placed in an off position during such a condition, the operating handle will indicate the correct status of the main contacts and the operator will be made aware that the main contacts are welded together.

REFERENCES:
patent: 4368444 (1983-01-01), Preuss et al.
patent: 4489295 (1984-12-01), Altenhof et al.
patent: 4546224 (1985-10-01), Mostosi
patent: 4554421 (1985-11-01), Grunert et al.
patent: 4638277 (1987-01-01), Thomas et al.
patent: 4656444 (1987-04-01), McKee et al.
patent: 4679018 (1987-07-01), McKee et al.
patent: 4691182 (1987-09-01), Mrenna et al.
patent: 4829147 (1989-05-01), Schiefen et al.
patent: 4894747 (1990-01-01), Livesey et al.

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