PROTECTIVE ELEMENT AND ITS APPLICATION METHOD

Japanese Patent JP3782176

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PROBLEM TO BE SOLVED: To provide a highly functional protective element having a simple structure as well as allowing easy manufacture, regarding a protective element for fusing a low-fusion point fusible alloy piece via the detection of the overvoltage of equipment, and the subsequent feed of power to a film resistor for heat-generation as well as the isolation of the equipment and the film resistor from a power supply. SOLUTION: The first electrode 21, the second electrode 22, the third electrode 23 and the fourth electrode 24 are arranged on one side of an insulating board 1. In addition, a resistor R is provided across the first electrode 21 and the second electrode 22 and low-fusion point fusible alloy pieces A and B are respectively laid between the second electrode 22 and the third electrode 23, and between the third electrode 23 and the fourth electrode 24. Furthermore, flux 4 is applied to the low-fusion point fusible alloy pieces A and B, and one side of the insulating board 1 is covered with an insulation layer 5.