Drop-out fuse cutout and load switching fuse cutout are of outdoor used high voltage protective device, to be connected incoming feeder of distribution transformer or distribution lines it mainlly protect transfomer or lines from short circuit and overload, and on/off loading current, Drop-out fuse cutout is composed of insulator supports and fuse tube, static conntacts is fixed on two sides of insulator support and moving tube, contact is installed on two ends of fuse tube. Fuse tube is composed of inside arc-extinguishing tube outer phenolic compound paper tube or epoxy glass tacts and arc-extiguishing exclosure for switching on/off loading current.