I have a fuse in my fusebox which I recently wired to my electric oven. It had been previously used for an electric shower and the cable is good for 30 amps. The oven needs only 15 amps so I changed the rating of the fusewire to 15 amps even though the fuse holder designated it to be a 30 amp fuse. I've since pulled the fuse out as I noticed that one of the two red wax like dots on the face of the ceramic fuse seemed to have melted. The fuse wire is still fine. Does anyone know what these dots are for and the significance of why they would melt - i.e. what fault this is designed to alert (as it is obviously designed to melt?).