Those chinesium dampers may not seal off terribly well and are a pain to try to interface as they're live to open/ live to close. A spring return one would be handier...
too much for too long. There's always a small amount of heating effect at a contact point- which in the case of a plug tends to weaken the sprung contacts that hold the fuse. Vicious circle then...
Tumbledryer? Immersion heater?