Hi I have a intertherm furnace model #FEHA-017HAC-01 with a fuse "panel" 2-30 amps and 2-60 amps the 60 amp fuse on one side burns out about every week or so I also notice the disconect "plug" is getting hot on this burnt fuse side as it is starting to discolour and deforme melted any suggestions?

Loose or burn connections generate heat, I would remove fuse disconnect and replace with breaker disconnect.
If you can obtain new parts for your fuse disconnect and holders, it may be salvaged.
I like Breakers.