An isolating switch, wherein the isolating switch comprises: a housing comprising a first wall, a second wall, a third wall and a fourth wall, the first wall and the second wall being arranged opposite to each other, the third wall and the fourth wall being arranged opposite to each other and connecting the first wall to the second wall respectively; a movable contact assembly comprising a movable contact bracket and a first movable contact arranged on the movable contact bracket, the movable contact bracket being pivotally arranged in the housing, the first movable contact being able to pivot together with the movable contact bracket; a first stationary contact fixedly arranged in the housing at a side close to the first wall and being able to contact and separate from the first movable contact; a first arc-extinguishing chamber arranged in the housing at a side close to the third wall and comprising a plurality of arc-extinguishing grids, which are sequentially arranged from a position close to the first stationary contact toward a side of the second wall; characterized in that the housing is provided with a first exhaust port, a second exhaust port and a third exhaust port, the first exhaust port and the second exhaust port are arranged on the first wall, the first exhaust port is closer to the first stationary contact than the second exhaust port, the second exhaust port is arranged between the first exhaust port and the third wall, and the third exhaust port is arranged on the second wall and adjacent to one of the plurality of the arc-extinguishing grids closest to the second wall in the first arc-extinguishing chamber. a housing comprising a first wall, a second wall, a third wall and a fourth wall, the first wall and the second wall being arranged opposite to each other, the third wall and the fourth wall being arranged opposite to each other and connecting the first wall to the second wall respectively; a movable contact assembly comprising a movable contact bracket and a first movable contact arranged on the movable contact bracket, the movable contact bracket being pivotally arranged in the housing, the first movable contact being able to pivot together with the movable contact bracket; a first stationary contact fixedly arranged in the housing at a side close to the first wall and being able to contact and separate from the first movable contact; a first arc-extinguishing chamber arranged in the housing at a side close to the third wall and comprising a plurality of arc-extinguishing grids, which are sequentially arranged from a position close to the first stationary contact toward a side of the second wall; characterized in that the housing is provided with a first exhaust port, a second exhaust port and a third exhaust port, the first exhaust port and the second exhaust port are arranged on the first wall, the first exhaust port is closer to the first stationary contact than the second exhaust port, the second exhaust port is arranged between the first exhaust port and the third wall, and the third exhaust port is arranged on the second wall and adjacent to one of the plurality of the arc-extinguishing grids closest to the second wall in the first arc-extinguishing chamber.