Drop-out High-Voltage Fuse

Drop-out fuse and load-switching drop-out fuse are outdoor used high-voltage protective device. Installed on the high-voltage side of distribution transformer or branch line of distribution lines, it mainly protects transformer and lines from short-circuit or overloading, and turns on/off load current. 

Drop-out High-Voltage Fuse

Drop-out fuse cutout and load switching fuse cutout are of outdoor used high voltage protective device. To be connecte with incoming feeder of distribution transformer or distribution lines it mainly protect transformer or lines from shod circuit and overload.and on/off loading current. Drop. out fuse cutout is composed of insulat lnsulator suppods and fuse tube. static contacts is fixed on two sides of insulator support and moving con tact js installed on two ends of fuse tube. Fuse tube is composed of inside arc-extinguishing tube, outer phenolic compound paper tube or epoxy glass tube. Load switching fuse cutout provides enforedelastic auxiliary con. tacts and arc extinguishing exclosure for switching on/off loading current.

Al normally working via fuselink tightened the fuse tube is fixed to form up of close position. 1n case system occure faults，fault current result in fuse melt immediately and take place electric arc. which let arc. extin. guishing tube being heated and explode a lot of gas. This will produce high pressure and blow off the arc along with tube. After fuselink melt moving contact has no tightened strength again，mechanism is locked and fuse tube drop out.Cutout now is in open position. When it needs to switchn off during cutout loadin9，operator shall via insulating operating bar pull the moving contact，at its beginning main contact and auxiliary static contact is contacted still. Whiling pulling the auxiliary contact is separated between auxiliary contacts there occur electric arc and the arc will be lengthened in arc extinguishing enclosure gap and meanwhile arc extinguishing explode gas to blow off the arc during current passing zero.