. device. Using the wrong fuse can cause serious injury, electric shock, or fire. However, the most common problem with electric heaters (still turns on, works, but doesn't produce heat) is a blown fuse. NTE Electronics makes high quality fuses and I highly recommend using them. They are often more reliable than the originals installed by the manufacturer. A sufficient number of terminals allows for individual installation. Very reliable. I am very satisfied with NTE's thermal cutoff fuses. Cheaper ones are often mislabeled, don't work as advertised (junk). Not NDE.