Low-pressure fusing disconnecting switch

Abstract

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.

Description

technical field [0001] The invention relates to an isolating switch, in particular to a low-voltage fusing type isolating switch. Background technique [0002] The existing low-voltage fuse-type isolating switch is composed of a mounting base, an insulating porcelain bottle, a connecting plate, an incoming line card, a knife switch, a fuse, and a switching device. The combined switch connects the knife switch and the fuse in parallel and passes through the connecting plate It is arranged on two insulating porcelain bottles, and the knife switch is composed of insulating porcelain rods and connecting components arranged at the ends, and the fuse is arranged between the connectors at the ends of the insulating porcelain rods. For example, the Chinese patent application No. CN200720201627.9 discloses an outdoor low-voltage fuse switch, which includes a base, a static contact seat and a moving contact seat installed on the base, and a fuse piece. A blade with a groove, one end ...

AI Technical Summary

Problems solved by technology

However, when the switch is closed, the contact area is often very small, or even only one point or one line of contact, so it cannot be well applied to low-voltage, high-current lines. When working for a long time, the contact surface will be overheated. It is easy to burn out the contacts, so it is cumbersome to replace the fuse, there are safety hazards and short service life, and the use and maintenance costs are high

Images