Drop-out fuse cutout and load switching fuse cutout are of outdoor used high voltage protective device, Tobe connecte with incomin-g feeder of distribution transformer or distribution lines, it mainly protect transformeror lines from short circuit andoverload, and on/off loading, current, Drop-out fuse cutout is composed of insulat insulator supports and fuse tube, static contacts is fixed on two sides of insulator support and moving contact is installed on two ends of fuse tube, Fuse tube is composed of inside arcexting tube. Outer phenolic compound paper tube or epoxy glasstube, Load switching fuse cutout provides enfored elastic auxiliry contacts and arc-extinguishing exclosure for switching on-off loading current.