You do not say at what point in the cycle that the fuse blows - precisely when. Knowing this will provide the big clue.
When you open the door at the end are the dishes clean, hot and dry? Has the drain pump removed the water? Is the fuse good until the moment you open the door?
Normally I would suspect the machine's heating element - this first starts to get used about 10 minutes or so into a cycle - and again at the end to provide drying heat.
Peccavi, January 2013