Fuse Element and Protective Element

Abstract

A protective element (30) includes an insulating substrate (33), a plurality of electrodes (34) provided on the insulating substrate (33), a fuse element (35) electrically connected to any electrode (34) of the plurality of electrodes (34), and a heat generation element (38) provided on the insulating substrate (33) for heating and fusing the fuse element (35). The fuse element (35) contains a composite metal material in which a first fusible metal (31) and a second fusible metal (32) are stacked, some of a component of the first fusible metal (31) being dissolved at a joint working temperature, the second fusible metal (32) being lower in melt temperature than the first fusible metal (31), at least some of a component of the second fusible metal (32) being molten at the joint working temperature.

Dependencies are inferred from the claim text.