Seems that the fuse is doing it’s job, heating up due to load and shutting down. Something down the line is shoring out, most likely one of the MOVs on the board (not the fuse itself).
If you can get your hands on a can of compressed air (kind that is used for cleaning keyboards and such), you could use it upside down to frost the board and identify the component which is actually damaged (it will be the first one to get hot and clear frost from itself and surrounding area).
This will give you an idea of what I’m talking about:
