At the first sight, the electric fuse manufacture and its working principle don't seen a hardly gain insight into matters, in fact this device operating is very complex, [1-7]. In general, when it studies fuses electro-thermal field, the electric fuses are supposed homogeneous bodies and the equations, which describe their electro-thermal behavior, refer to only fuselink, the main part element. But, with a view to catch better the electro-thermal phenomena of fuses as a whole, it comes out the problem of system heating calculation, system made from "n" element parts, each of them taking part in mutual heat changing and towards environment.
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