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A high temperature PTC device comprising a polymeric conductive composition that includes nylon-11 and a carbon-based particulate conductive filler has a switching temperature greater than 150.degree. C., preferably between about 160.degree. C. and 200.degree. C. The composition demonstrates a high

A high temperature PTC device comprising a polymeric conductive composition that includes nylon-11 and a carbon-based particulate conductive filler has a switching temperature greater than 150.degree. C., preferably between about 160.degree. C. and 200.degree. C. The composition demonstrates a high PTC effect (at least 10.sup.3, and more typically 10.sup.4 to 10.sup.5 or greater) and a resistivity at 25.degree. C. of 100 .OMEGA.cm or less, preferably 10 .OMEGA.cm or less. High temperature PTC devices that comprise nylon-11 or nylon-12 compositions and that are manufactured by extrusion/lamination demonstrate good thermal and electrical stability compared with those manufactured by compression molding and do not require composition crosslinking for stability, although crosslinking may be used to further improve stability. The use of a high temperature solder for attaching electrical terminals to the device improves the PTC properties of the device.

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[ What is claimed is:] [1.] An electrical device which exhibits PTC behavior comprising:(a) a conductive polymeric composition that includes at least one of nylon-11 or nylon-12 and about 10% to about 70% by volume of a particulate conductive filler selected from carbon black, graphite and metal par

[ What is claimed is:] [1.] An electrical device which exhibits PTC behavior comprising:(a) a conductive polymeric composition that includes at least one of nylon-11 or nylon-12 and about 10% to about 70% by volume of a particulate conductive filler selected from carbon black, graphite and metal particles, said composition having a resistivity at 25.degree. C. of 100 .OMEGA.cm or less and a resistivity at a T.sub.S greater than 125.degree. C. that is at least 10.sup.3 times the resistivity at 25.degree. C.;(b) at least two electrodes which are in electrical contact with the conductive polymeric composition to allow a DC current to pass through the composition under an applied voltage; and(c) an electrical terminal soldered to an electrode by a solder having a melting temperature at least 10.degree. C. above the T.sub.S of the composition.