A fuse is another safety mechanism which works on joule heating principle. Fuse is a wire made up of a Nickel and Chromium alloy which has a definite melting point. If current passes through the fuse beyond a particular desired value, the excess heat poduced melts the fuse wire, thus the electrical connection is cut - off . Fuse has to be kept in tight a ceramic enclosure to avoid the melting heat from producing fire accidents.
