Low-pressure fusing disconnecting switch

The invention discloses a low-pressure fusing disconnecting switch. The low-pressure fusing disconnecting switch comprises a base (1), a silicon rubber insulator support column (2), a knife switch arranged on the silicon rubber insulator support column (2), a fusing body (10) and a wiring board (11), wherein the knife switch comprises a moving contact (3), a static contact (9), two knife switch plates (4), a pull ring (6) and a pressure spring (13); the side face of the moving contact (3) is provided with a moving contact concave touch surface (17), and/or the side face of the static contact (9) is provided with an annular concave touch surface (18); the contact surface of each knife switch plate (4) and the moving contact (3) is provided with a front-end convex touch surface (16), and the contact surface of the each knife switch plate (4) and the static contact (3) is provided with an annular concave touch surface (15); and the low-pressure fusing disconnecting switch also comprises a flash guard. The low-pressure fusing disconnecting switch provided by the invention has the advantages of simple structure, convenience in use, safety, reliability, low processing cost and large contact area; when the switch is opened and closed, the electric arc can not be generated, thereby prolonging the service life.