H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/144
H01H 85/18 (2006.01) H01H 85/045 (2006.01) H01H 85/10 (2006.01) H01H 85/47 (2006.01)
Patent
CA 1060068
PROTECTOR FOR ELECTRIC CIRCUITS ABSTRACT OF THE DISCLOSURE: A current-limiting, single-element, dual-function, electric fuse has a fusible element with at least one "weak spot" of very small cross section; and the temperature of that weak spot will exceed eighty percent of the melting temperature of the material of the fusible element when that electric fuse operates at its maximum continuous current carrying capacity. Because the temperature of that weak spot is so close to the melting temperature of the material of that fusible element, that weak spot can quickly melt and interrupt the circuit through the electric fuse in response to a low but potentially- harmful overload. The weak spot can be given a very small cross section, and it can be permitted to operate at temperatures close to the melting temperature of the material of the fusible element, because the housing for the electric fuse and arc-quenching filler within that housing dissipate large amounts of the heat which is generated by that weak spot. Specifically, an appreciable amount of the heat, which the weak spot generates in response to a low but potentially-harmful overload, will be conducted to the inner surface of the housing for the electric fuse by the arc-quenching filler; and a substantial percent of that conducted heat will pass to, and be radiated by, the exposed outer surface of that housing. The conduction of heat to the inner surface of the housing is fostered by locating the weak spot closer to that inner surface than to either terminal of the electric fuse; and the passing of that heat to the exposed outer surface of that housing is fostered by making that housing of a material which has a thermal conductivity in excess of thirty thousandths of a calorie per square centimeter of cross section per centimeter of length per second of time per degree centigrade.
227869
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