Patent ID: 7330098

Claim:
A thermal fuse comprising: a first lead member fixed at a first opening of a metallic, cylindrical casing via an insulated bushing, a second lead member crimped and thus fixed at a second opening of said casing, and a switching function member accommodated in said casing, wherein said switching function member includes a thermosensitive pellet, a movable conductor engaged with said thermosensitive pellet, and a spring member pressing said movable conductor, wherein said thermosensitive pellet is adapted to soften or melt at a prescribed operating temperature so as to liberate said spring member from a load so that said spring member can move said movable conductor to switch an electrical circuit provided between said first and second lead members, wherein said thermosensitive pellet is formed of a thermosensitive material selected depending on a characteristic in flowability presented as said thermosensitive material softens or melts, and wherein said thermosensitive material is a thermoplastic resin having said characteristic in flowability of at least 0.5 g/10 min. as represented in a melt flow rate.