The drop-out fuse consists of an insulating bracket and a fuse tube. The static contacts are fixed on both sides of the insulating bracket, while the movable contacts are installed at both ends of the fuse tube. The fuse tube is made of an inner arc-extinguishing tube, an outer phenolic composite paper tube, or an epoxy glass tube. Load switch fuses provide enhanced elastic auxiliary contacts and arc extinguishing devices for switching load currents.
During normal operation, the fuse secures the fuse tube to form a closed state. In the event of a fault, the fault current will cause the fuse to blow and generate an arc. The arc-extinguishing tube heats up and releases a large amount of gas, which creates high pressure and extinguishes the arc along with the fuse tube.
When the fuse blows, the movable contact loses its fastening strength, causing the mechanism to lock and the fuse tube to drop. At this point, the fuse is in an open circuit state.
When it is necessary to interrupt the load current, the operator should pull the movable contact using an insulated operating rod. Initially, the main contact and auxiliary static contact remain in contact.
During the pulling process, the auxiliary contact separates from the auxiliary static contact, generating an arc. The arc is extended in the arc extinguishing device, and the explosion of gas inside the arc extinguishing tube blows out the arc.
Materials: Silicone Rubber or Porcelain
