This is nothing new. It is called a blown fuse. Why it blew is the harder thing to tell. The easy way to see if it blew due to larger than rated load is to add up the fuse values for each of your amps and see if they exceed the fuse that blew (or since it was in a distro, just the amps connected behind that particular fuse). If the fuse values of the amp(s) that connect through that fuse are bigger than the blown fuse, that is an easy fix. If you are sure you have big enough wire to handle the fuse value at the amp(s), then replace that fuse with a fuse that matches the wire rating. If you are using 8 gauge wire that is rated for 50a, then you can safely use a 50a fuse. If your amp(s) have more than 50a worth of fuses, then you would need to upgrade that wire to something larger. 4 gauge is good up to about 125a.
