Quote Originally Posted by Jonathan View Post
For 630VA you'd probably get away with it.
I thought the same but for no apparent reasons I am unable to turn on my router. My 16A main fuse is tripping. After a few attempts I managed to get it on but later on trying again I manage to blow the T4A fuse at the toroid.

The only reasons I could think about are the temperature drop in the workshop (7°C) or some alterations on the mains electricity supply.