I too think that fuse is a bit underated for the job. Surges could easily go over that current. If it was mine I would change to a 35 but I am not standing there looking at the wire size.
If you want to use a breaker that resets itself you can replace the fuse with an inexpensive item shown in the link. You can buy them at an automotive store.
Thermal breakerIf you happen to run your battery way down and then plug in the shoreline the breaker may cycle on and off while the battery begins to fill up. Better than blowing fuses and wondering why.