| 摘要 |
An alloy type thermal fuse of an operating temperature of 75 to 120° C. is provided in which a fuse element of a Bi-In-Sn alloy is used, excellent aging and heat cycle resistances for a long term can be ensured, and satisfactory operating characteristic can be ensured. A material for a thermal fuse element has an alloy composition in which In is 15% or larger and smaller than 37%, Sn is 5% or larger and 28% or smaller, and balance Bi, and in which, with respect to each of reference points of ternary Bi-In-Sn eutectic points of 57.5% Bi-25.2% In-17.3% Sn and 54.0% Bi-29.7% In-16.3% Sn, a range of ±2% Bi, ±1% In, and ±1% Sn is excluded.
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