The AP's come with a fuse holder which is pretty much the knu fuse holder except it says AP lol. And yeah they come with fuses my ap1500 came with a 150A fuse which I bumped up to a 200A when I switched to 0gHa thought they had onboards but then again I never cared enough to check. Dnt all new AP amps come with a free fuse and fuse holder?? 0awg is a good idea if u plan on going bigger in the future if u dnt 4awg will do. Its seems like ur trying to do this on the cheap so just stick with that knu kit its a decent set at a good price.