The good ol' 10A fuse or 5 amp. This is really a 10 amp fuse designed to blow at 10 amps. This means it is designed to accommodate surges which can happen like when your fans kick on. American fuses don't blow except at higher amps for which they are rated. Putting a bigger fuse in when a proper fuse keeps blowing is not a cure. Sort the actual problem out or you just may blow your system and top as well!