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This invention relates generally to a heat actuated fuse and to an apparatus which incorporates such a fuse for protecting electrical circuitry. The invention is particularly useful for interrupting current flow to thick film circuits and components. A heat actuated fuse has an important advantage over the more common current actuated fuse. Although both types of fuses ultimately open at a predetermined temperature, a heat actuated fuse can be positioned such that it responds directly to the temperature of a protected component or circuit, and temperature is often a better indicator of imminent failure than current. Examples of known heat actuated fuses are described in Great Britain Patent 2,145,295A and U.S. Pat. Nos. 4,533,896, 5,084,691, and 5,097,247. Great Britain Patent 2,145,295A discloses a thermal fuse disposed on a substrate nearby a resistor, which is also disposed on the substrate. The fuse includes a pair of electrodes defining a gap between them, a gold fuse link extending across the gap to electrically interconnect the electrodes, and a film of solder overlying the gold fuse link and overlapping at least one of the electrodes. When the temperature of the substrate exceeds the melting point of the solder film, the solder is intended to melt, dissolve the gold fuse link, and then retreat from the gap with the dissolved gold to sever the electrical connection between the electrodes. This fuse is relatively simple to manufacture, but its reliability depends on thorough dissolution of the gold fuse link by the process of leaching. This is a gradual process which begins after the film of solder melts. The gold fuse link then dissolves and is attracted to tin in the solder. The speed of opening of this fuse is relatively slow, and the solder material is limited to a composition containing tin or whatever material will effectively leach the gold or other metal chosen for the fuse link. U.S. Pat. No. 4,533,86 discloses a fuse for protecting thick film devices deposited on a substrate. The fuse includes two terminal clocks, each including a hole, which are mounted to the substrate in close proximity to each other and with the holes aligned. An electrically conductive fusible link (e.g., solder) is suspended across a space between the terminal blocks and extends into the holes to complete an electrical circuit. The holes are larger than necessary to accept the fusible link so that, when the fusible link melts because of excessive heat, molten material from the fusible link will be drawn into the holes. Manufacture of this fuse is a complicated and labor intensive process. Manufacture requires boring of holes in the terminal blocks, coating the inner surfaces of the holes and the end surfaces of the terminal blocks with solder, assembling the blocks and fusible link, and then positioning and soldering the assembled fuse onto electrodes provided on the substrate. U.S. Pat. No. 5,084,691 discloses a thermal fuse comprising a pair of silver conductive pads and a solderable and/or meltable electrically conductive bar extending between the conductive