Patent ID: 7323966

Claim:
A thermal pellet incorporated thermal fuse comprising: a cylindrical enclosure accommodating a thermal pellet formed of a thermoplastic resin as a thermosensitive material molded into a pellet, said thermosensitive material being adapted to thermally deform when it is heated; a first lead member forming a first electrode attached to a first opening of said enclosure; a second lead member forming a second electrode attached to a second opening of said enclosure; a movable conductive member accommodated in said enclosure and engaged with said thermal pellet; and a spring accommodated in said enclosure and arranged to exert a force on said movable conductive member; wherein said thermal pellet has a heat distortion temperature in said thermal fuse adjusted to a desired operating temperature, so that when said thermal pellet, receiving said force exerted by said spring, is heated, said thermal pellet will soften or melt, and thermally deform, at said desired operating temperature and thereby an electric circuit between said first and second electrodes will be switched.