What gear are you running? I'm only running 125RMS per channel for my front stage, and 400RMS for my sub, and they're both fused at 40A a piece.
To the OP, I've spent time trying to find an amp that requires a key to adjust settings. That way people like us that are knowledgeable can set the gains, and have them locked in place. Otherwise people just crank the gains because it gets louder, not realizing they're clipping the hell out of the amp.
As for the key, my amp is so close to the wheel-well and the gain adjustments are an indented "screwdriver hole" (basically a split shaft pot recessed.) My tool for adjustment is a cut-off roofing nail ground down to a flat head screwdriver point...... And a mirror.
Those 8002 are a big class AB, the fuses should be parallel as they are on just about every amp. I have a broken one here someplace. Right if the other fuse is not working then one fuse is too small, you should test the fuses one at a time if in question.
So you have 2 ohm on each channel? That should be ok, but those amps do blow up. I have no idea what they do to them to make them blow, the A-bon amps work pretty nice otherwise, are fairly efficient for class AB amps.
I have twice the fuse in my kappa4 as in my current sub amp, an alpine M301 at 350rms and 2 ohms.