Drop-out fuse cotout and load swtching fuse cutouts are out door high voltage protection device.they are connected with the incoming feeder of the distribution transformer of distribution line. For example :the RXWO-35,RW9-35,RW10-35type of outdoor high -voltage fuse is applied to protect the short circuit and overloadof electrical transmission line and transformer.and is the simplest electrical appliance to prevent the power equipment from being broken.