| 摘要 |
PROBLEM TO BE SOLVED: To develop heat resistance performance of a protected apparatus in the maximum by using a low melting point fusible alloy, each having a composition within specified wt.% of Bi and Pb and the balance In in a fuse element. SOLUTION: A low-melting point fusible alloy, having a composition of 40-50 wt.% Bi, 13-25 wt.% Pb and the balance In is preferably used in a fuse element. Working temperature of an alloy type temperature fuse is set at 80-84 deg.C, the difference between liquidus temperature and solidus temperature of the fuse element is limited to within 5 deg.C, and resistance value changes caused by elongation of the fuse element in the manufacture of the alloy type temperature fuse is suppressed to a negligible range. An alloy-type temperature fuse using a Bi-Pb-Sn-Cd base alloy having a solidus temperature of 70 deg.C and a liquidus temperature of 72 deg.C as the fuse element and an alloy-type temperature fuse using a Bi-Pb-Sn base alloy having a eutectic point of 95 deg.C for the fuse element under cooperation for safely protecting an apparatus which has an allowable temperature of 100 deg.C or lower.
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