The utility model discloses an isolator separating brake appurtenance, this separating brake appurtenance include action bars, slide bar and connect coupling mechanism between action bars and the slide bar, the head of action bars is equipped with separating brake mechanism, its afterbody with the connection can be dismantled to coupling mechanism's one end, be equipped with the balancing weight on the slide bar, the endwise slip of slide bar can be followed to the balancing weight, coupling mechanism be used for with the power that the balancing weight produced is passed through the action bars transmits to separating brake mechanism. During the use, earlier pull out isolator's anticreep drag hook fixedly, manually operation balancing weight is again held fast balancing weight hammering coupling mechanism down, transmits inertial force to through action bars and separating brake mechanism that isolator moves, static contact department, makes progressively loose taking off of static contact and switch tie point through the mode of strikeing many times, can reduce the damage to isolator.