Circuit breaker with interlock for welding contacts

Details Circuit breaker with interlock for welding contacts Circuit breaker with interlock for welding contacts

1991-05-29

1992-11-24

Recla, Henry J.

Electricity: circuit makers and breakers

Toggle mechanisms

200327, 200DIG42, 335 24, 335166, 335168, H01H 525

Patent

active

051655322

ABSTRACT:
A circuit breaker includes an interlock which prevents movement of the handle to the off position when the contacts are welded closed. The interlock includes a pair of floating links which jam between slots in arms of the yoke of a spring powered operating mechanism which carries the handle, and recesses in the rotatable cross-bar carrying the movable contact arms. The recesses are offset from the rotational axis of cross-bar so that an attempt to move the switch to the off position generates a moment which will break open lightly welded contacts.

REFERENCES:
patent: 3525959 (1970-08-01), Ellsworth et al.
patent: 3605052 (1971-09-01), Dimond et al.
patent: 3614685 (1971-10-01), Ellsworth et al.
patent: 3849747 (1974-11-01), Mrenna et al.
patent: 4165453 (1979-08-01), Hennemann
patent: 4368444 (1983-01-01), Preuss et al.
patent: 4630019 (1986-12-01), Maier et al.
patent: 4679016 (1987-07-01), Ciarcia et al.

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