| 摘要 |
The invention relates to electrical devices comprising a layer of a PTC conductive polymer (3) and a sheet electrode (1, 2) in contact with each face of the PTC layer. According to the invention, such devices have improved performance when the electrodes extend to the sides (33) of the layer and the sides of the layer are concave. Preferred devices of the invention are circuit control devices which protect a circuit from increases in current resulting from a fault. |
