This is an NFC fuse cartridge for TeSys GS load break switch fuse devices. It is an aM fuse link that protects against magnetic overcurrents only and is suitable for motor protection. Its current rating is 50A and maximum voltage rating is 690VAC. 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.