Thermal pellet incorporated thermal can be the adjustment of the operating temperature of the thermal deformation temperature of the fuse, even when exposed to severe external environment, providing a thermosensitive material capable of inhibiting not suitable for modification or alteration, and the choice of operating temperature widen, improving the insulation resistance after operation, and the response speed at the time of fast operation, and also improve the strength of the thermal pellet (3), it has as its object to provide a thermal fuse inexpensive. For this purpose, a polymer material, the thermoplastic resin to the thermosensitive material, and adjust the heat distortion temperature of the thermal pellet (3) by a temperature setting method, and the envelope: strong compression of the spring member in (enclosure 1) a metal case the spring 6 and to accommodate with the weak compression spring 8 is sealed airtight. ; Pellets, fuses
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