Patent ID: 8400253

Claim:
A thermal fuse resistor comprising: a resistor; a thermal fuse disconnecting a circuit as heat is applied thereto from the resistor; a lead wire connecting the resistor with the thermal fuse in series; a case provided with an open surface used to receive the resistor and the thermal fuse therein in a state in which an end of the lead wire is drawn out of the case and provided at one wall surface thereof with a drawing groove used to draw the lead wire; and a filler filled in the case to bury the resistor and the thermal fuse therein and including silicon dioxide, wherein the case is formed by injection-molding thermosetting resin having heat resistance less than heat resistance of the filler, the resistor and the thermal fuse are provided in the case such that the resistor and the thermal fuse face the open surface side by side, a wall surface of the case facing the open surface has a thickness in a range of about 0.5 mm to about 1.5 mm, and a thickness of a first portion of the wall of the case in which the resistor is provided is smaller than a thickness of a second portion of the wall of the case in which the thermal fuse is provided, such that the resistor and the thermal fuse, both provided in the case, are aligned with each other on substantially the same level relative to the open surface.