We have some electric candles that my wife likes to put in the front windows at Christmas time. This year one of them didn't work even with a new bulb, and a second new bulb, and I was told to fix it or throw it out. My first thought was that the crummy rotary switch that's inline with the cord must have failed, and I thought maybe it could be fixed easily. But no, there was actually no conductivity from the plug pin to the switch. So then I looked more closely at the plug (a 2-pin polarized type) and I saw that there was a little compartment in it with a sliding cover. I opened this, and inside there was a tiny fuse, which the meter showed had no conductivity. So the diagnostic problem's solved, and I'm inclined to dump the light rather than go hunting for a new fuse. But I'd never seen a fused plug in the USA before--although I have to admit that there could be plenty of them around, and the fuses in the ones we own just haven't had a reason to blow yet. One thing you can easily see is that the sliding cover to the fuse compartment can only be opened when the plug isn't in a receptacle:
