Over-current protection devicection device

Abstract

An over-current protection device includes an electrode layer and a heat-sensitive layer. The electrode layer has a top metal layer and a bottom metal layer, and the heat-sensitive layer is laminated between them. The heat-sensitive layer exhibits a positive temperature coefficient (PTC) characteristic and includes a polymer matrix and a conductive filler. The conductive filler includes a metal compound dispersed in the polymer matrix, thereby forming an electrically conductive path in the heat-sensitive layer. The metal compound consists of a metal carbide and unavoidable impurities. The total amount of the metal carbide and unavoidable impurities is taken as 100%, and the metal carbide accounts for at least 90%.

Dependencies are inferred from the claim text.