Signal output device for oil-immersed fuse

The utility model discloses a signal output device for an oil-immersed fuse. The signal output device comprises a switch cover, a microswitch, a rapid plug member and a connection terminal. The switch cover comprises a cover plate, an outer ring connected to the front end surface of the cover plate and a switch groove connected to the front end surface of the cover plate and arranged in the outer ring. The cover plate of the switch cover is provided with a cable passing through communicated with the switch groove. The microswitch is arranged in the switch groove of the switch cover in a manner that a contact operation handle thereof is arranged forward, and is fixed and sealed to the switch groove of the switch cover through epoxy glue. The rapid plug member and the connection terminal are arranged outside a base. The rapid plug member is formed by a plug and a socket. The signal output device is simple in structure and convenient to assemble and disassemble, and can provide signal output after the fuse acts, thereby preventing a circuit from operating with phase fault, and reducing security risk.