The fuse is fixed on the mounting frame by the mounting plate, and the fuse is connected in series in the power line during operation, and when it is working normally, the fuse tail wire makes the movable joint between the fuse tube and the moving contact locked, and the fuse tube can be in the position of the platform brake under the pressure of the release contact. When the power system fails, the fault current makes the wire fuse rapidly, and an arc is generated in the wire tube, and the steel paper tube lined with the fuse tube and the inner arc suppression tube sleeved on the fuse tube produce large gas under the action of the arc, so that sufficient pressure is formed in the fuse tube, and a strong longitudinal blowing is formed along the fuse pipe, so that the arc is rapidly elongated, and when the current is excessive, it is extinguished due to the strong de-free action and the fuse is blown off, and the tension of the fuse is lost, and the movable joint is released, and the fuse is under the action of the elastic yellow pressure of the upper and lower static contacts and the weight of the fuse tube itself. Falls quickly, creating a clearly visible isolation gap.