Kyosan 25FH50 50 Amp Clear Up Fuse for AC Amplifiers. Normally fitted in various Japanese manufacturers parts from the following: Fanuc, Fuji, GE Fanuc, Hitachi Seiki, Mori, Okuma and many other CNC manufacturer drive systems. The parts are normally 3phase AC Amplifiers. The 25FH50 is also known by its Fanuc part number. This particular Kyosan Fuse part of the FH series is a small sized metal clear up Fuse with a rating of 50A 250V.