| 摘要 |
A disconnector and related surge arrester are described, comprising a first and a second connection terminals (1, 2) for connection to the active leads of an electric system, between which a protection element (3) is inserted, provided with a pair of electrodes (4) electrically connected to said connection terminals, a disconnector arranged between said first terminal (1) and an electrode (4) of the protection element (3) comprising a metal plate (5) having a base end (5a) electrically connected to said first terminal (1) and a distal end maintained electrically connected to said electrode (4), said plate (5) being made of a material and section suited to cause it to sublimate in the presence of short-circuit currents above a preset threshold, an intercepting slider (7), mounted longitudinally slidable along a longitudinal direction which lies between said base end (5a) of the lamina (5) and said electrode (4) of the protection element (3) to intersect development of an electric arc, a sliding guide (6) for said intercepting slider (7), the slider being biased in said longitudinal direction, through preloaded elastic means (8), towards an intercepting position abutting a portion of said plate (5), wherein said slider (7) is in the shape of a hollow, elongated body, open at a rear end and closed at a front end, and partly houses said preloaded elastic means (8), and said slider (7) is provided with at least one opening (10), on the side wall of said hollow body, which runs through the thickness thereof and puts in communication the outside with the inside of said hollow, elongated body of the slider (7). |
