The utility model relates to an isolating switch, which comprises a movable contact arm, a static contact arm and a transmission mechanism for driving the movable contact arm to act, the transmissionmechanism comprises a rotating piece, and an attitude sensor for detecting the opening and closing states of the isolating switch is fixed on the rotating piece. Because the rotating member and the moving contact arm have similar motion rules, the motion track of the rotating member can be monitored in real time through the attitude sensor arranged on the rotating member, thereby realizing the detection of the opening and closing states of the moving contact arm.