My guess is fuse in the plug the other is the MCB unit fuse has tripped, not sure if these work on the 6amp fuse or 13amp check the MCB box fuses see if one or other has tripped off. If yes reset it switching it back on and you switch fridge on to mains and it trips again there must be a fault in the fridge, fridge's plug or the socket it's plugged in to.
Bob
March 2011