| 摘要 |
PROBLEM TO BE SOLVED: To break securely a current-conducting path through which an overcurrent is made to flow with high responsiveness by connecting a conductive wire to generate heat by means of overcurrent between a pair of conductors, covering the periphery of the conductive wire with a resin and forming a thin covering layer in the vicinity of the route of the conductive wire. SOLUTION: A conductive wire 3 to generate heat by overcurrent is connected between a pair of electrode pieces 1, 2 by means of wire bonding, and then, a resin layer 4 is formed by covering the periphery of the conductive wire 3, for instance, in a condition that seals it with a molded resin such an epoxy resin by means of transfer mold using a molding die. When the resin layer 4 is formed, a thin covering layer 5 is formed at the same time by recessing the vicinity of the route of the conductive wire 3 into a circular form. Thereby, when the conductive wire 3 connected between the pair of electrode terminal pieces 1, 2 generates heat and raise temperature, the heat of the resin layer 4 is concentrated on the thin covering layer 5 and a large quantity of gas is produced during the carbonization process of the resin. Then, a small- scale gas explosion occurs and a current-carrying path of a part forming the thin covering layer 5 is securely broken. |
