My Dessalator Duo also once had the problem after long motoring (3 days nonstop) and a hot engine room. It only run 30min and then switched the fuse. After cooling down the engine room temp (after a day or so), it worked fine again.
I did not Change the fuse yet, but if you have detailed Information what fuse you installed and if it fits with the existing type (easy mounting?) I would be happy,
SY Santa Isabella
AMEL 54 #144