ANL Fuse ? Car Audio ?

What is the purpose of a ANL Fuse .... I got a 4 guage wiring kit for my kicker zx750.1 amp .... the kit came with a 100 amp anl fuse and anl fuse holder .... I was just wondering what the purpose of that fuse is when i already have a 2 farad Rockford Fosgate Cap .... Im running 2 kicker comp cvrs @ 750 watts rms on a 2 ohm load .... also with this be too much power for my stock 80 amp alternator ?
 
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