This is an NFC fuse cartridge for TeSys GS load break switch fuse devices. It is a gG fuse link that protects against thermal overload and magnetic overcurrents and is used in standard applications. Its current rating is 40 A and maximum voltage rating is 690 VAC. It is a cylindrical fuse (NFC type), the dimensions are 22mm x 58mm. It does not have a striker that indicates when the fuse is blown. This fuse is sold as a set of 10 pieces.