Description:
Drop-out fuse cutout and load switching fuse cutouts are outdoor high voltage protection devices. They areconnected with the incoming feeder of the distribution transformer or distribution lines. These are primarily used toprotect transformers or lines from short circuits and overloads and switching currents. The drop-out fuse unit iscomposed of insulator supports and a fuse tube, static contacts are fixed on two sides of the insulator supportand moving contact is installed on two ends of fuse tube. The interior of the fuse tube is the extinguishing tube. theexterior is made of the phenolic compound paper tube or epoxy glass. Load switching cutout fuse provides stretchauxiliary contacts and arc-extinguish exclosure for switching on/off loading current.
In normal operation, the fuse link is tightened to form tho closed position. in the fault current situation, the fuse linkmelts and an electrical arc is formed, The arc-extinauishing tube is as occurs, This causes hioh pressure inside the tubeand causes the tube to separate from the contacts. The strength of the contact is relaxed once the fuse elements meltThe cutouts now in the open position, the operator needs to switch the current off. Then with an insulated operating barthe moving contact can be pulled off. The main contact and auxiliary contact is connected
