Fuse cutout and load drop fuse are outdoor high voltage protection electrical appliances.

It is installed on the high-voltage side of the distribution transformer or on the branch trunk line of the distribution line, and is used for short-circuit, overload protection and load current interruption of the transformer and the line.

The fuse cutout is composed of an insulating bracket and a fuse tube. The static contacts are installed at both ends of the insulation bracket, and the moving contacts are installed at both ends of the fuse tube. The fuse tube consists of an inner arc suppression tube and an outer layer of epoxy glass. Tube composition.

The load-dropping fuse has an elastic auxiliary contact and an arc extinguishing cover for dividing and closing the load current.

When the fuse cutout is in normal operation, the fuse tube is tensioned by the fuse to form a closed position.

When the system fails, the fault current quickly blows the fuse and forms an arc. The arc extinguishing tube is heated by the arc and decomposes a large amount of gas, causing a high pressure in the tube to form a longitudinal blow along the tube, and the arc is rapidly elongated. And goes out.

After the fuse is blown, the lower movable contact loses the pulling force and turns down, the locking mechanism releases the fuse tube, and the fuse tube falls, forming an obvious breaking position.

When the load needs to be pulled, use the insulating rod to pull the moving contact. At this time, the active and static contacts are still in contact. Continue to pull the contact with the insulating rod. The auxiliary contacts are also separated. An electric arc is generated between the auxiliary contacts. The arc extinguishing hood is elongated in the slit, and the arc extinguishing hood generates gas at the same time, and the arc is extinguished when the current crosses zero.