Electrical knife switch is mainly made up of moving contact knife, fixed contact knife block, incoming and outgoing line block, these conductive parts are fixed on the porcelain bottom plate. Together with other protective devices: arc-extinguishing chamber, fuse, etc., all covered by an insulating cover.

So when the knife is closed, the operator does not touch the live part. The protective cover is to make sure the poles are separated from each other to prevent the short circuit caused by the arc between poles;

Prevent arc flying out of the cover, burn the operator; Prevent metal parts from falling on the knife to form a short circuit between poles.

The role of electrical knife switch in the circuit is mainly used for isolating power supply or manually connecting and disconnecting AC and DC circuits, but also for infrequent connecting and disconnecting load below rated current, such as small motors, electric furnaces, etc., act as a power switch, isolating switch, emergency switch and circuit protection.