Protection switch

Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific circuit breaker or control structure

Patent

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Details

361 93, 335 20, H01H 7300

Patent

active

051722941

ABSTRACT:
A protection switch with sudden switching on and off, a trip-free release and forced opening is described. A manually movable actuator (10) forms with a U-clip (50) a toggle lever. One leg (51) of the U-clip (50) forming the toggle joint axis is displaceably guided in the actuator (10) in a link (15) with a variable spacing from its rotation axis (11) and against the action of a spring (14) supported on the actuator (10). The other leg (52) of the U-clip (50) is guided in a fixed link (25) and in a ratchet lever (40). The ratchet lever (40) serves to transfer movement to a contact arrangement (21, 22) and cooperates with the release ratchet (60) of an overcurrent and/or undervoltage monitoring device. The fixed link (25) controls the engaging movement of the ratchet lever (40). In an intermediate position of the ratchet lever, it has a detent (26), which only releases said other leg (52) of the U-clip (50) following the further movement of the actuator (10) over and beyond the dead center position of the toggle lever (10, 50) and the tensioning of the spring (14) for sudden contact closure. The construction requires a minimum of parts, particularly if the spring (14) is directly shaped onto the actuator.

REFERENCES:
patent: 4206430 (1980-06-01), Busch et al.
patent: 4635013 (1987-01-01), Lemarquand
patent: 4768007 (1988-08-01), Mertz et al.
patent: 5079529 (1992-01-01), Ohishi et al.

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