Patent ID: 7989726
Filing Date: 2011-08-02
Classification: H01H

Abstract:
1. A gas-tight, high or medium voltage electric switch device comprising an enclosure containing switch contacts capable of occupying an open position and a closed position, and a window for observing the open or closed position of the switch contacts from outside the enclosure, the enclosure being a composite insulator formed by a rigid tube surrounded by an elastomer casing whose outside surface defines a succession of annular fins, the casing being constituted in a single part molded on the rigid tube, the rigid tube being made of a plastics material that is at least translucent, wherein a segment of the casing surrounding the switch contacts is made of an elastomer material that is at least translucent, said segment defining said observation window, the translucent segment of the casing being made by injection molding a first elastomer material and being interposed between two end segments of the casing which are made by injection molding a second elastomer material having a greater fill of mineral fillers than the first elastomer material, the portions of the device that come into contact with solar radiation withstanding ultraviolet radiation, the enclosure being filled with a dielectric gas which is at a pressure of 2 bars to 3 bars.