Importance

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Abstract

An isolation switch comprises a mounting plate with a hub adapted to extend forwardly through a wall of an explosion-proof enclosure. A shaft is journaled for axial movement in the hub. First and second stationary contact members are supported on the mounting plate. The first stationary contact member has input and output power contacts, and the second stationary contact member has first and second grounding contacts. Jumpers connect the output power contacts with the second set of grounding contacts. A moveable contact member is moveable by the shaft between a 'closed' position connecting the input and output power contacts; and an 'open and load-side-grounded' position disconnecting the input and output power contacts and connecting the output power contacts to ground through the grounding contacts. A handle assembly is eccentrically pivoted on the forward end of the shaft, is guided for forward and backward swinging movement, and has cam bosses guided for transverse movement relative to the shaft. The handle assembly has a transverse latch bar connected to a moveable sleeve and has detent tongues engageable with detent flanges on an operator latch guide at the forward end of the hub to hold the handle assembly in closed or open position. In the embodiment shown, the latch bar and detent flanges are asymmetric, that is, the latch bar is eccentrically mounted and the detent flanges are at different axial heights corresponding to the eccentricity of the latch bar.

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First Claim