Patent ID: 9583296
Date: 2017-02-28
CPC Classifications: H01C,H01H

Claim:
1. A varistor provided with a degradation alarm function the varistor comprising: a first resistance element; an indicating element coupled in series with the first resistance element; a first thermal fuse coupled in parallel with a pair of the first resistance element and the indicating element; a varistor element coupled in parallel with the first thermal fuse; and a second resistance element disposed in an interconnect line between the first thermal fuse and the varistor element, wherein a fusing temperature of the first thermal fuse is set such that the fuse is blown out at temperatures not lower than a temperature increased by heating when a current larger by a certain value than a maximum current rating of the varistor element passes through the fuse; and the second resistance element is larger in resistance than the first resistance element.