Fuse Switch Disconnector, Isolation Fuse Switch, Fuse Switch, Fuse Switches, Fuse Base, Fuse Holder, Switch Disconnector. Fuse Switch Disconnector, Isolation Fuse Switch, Fuse Switch, Fuse Switches, Fuse Base, Fuse Holder, Switch Disconnector.HR17 ... used to operate the single motor. When isolator with isolation knife replace fuse, this switch does not have the electric circuit to ...