Positive temperature coefficient device

A PTC device, comprising:

• two electrode layers;
• and
• a PTC material layer having a volumetric resistivity less than 0.2 μΩ-cm and being laminated between the two electrode layers, comprising:
• a crystalline polymer comprising thermoplastic polymer, thermosetting polymer or mixtures thereof;
• conductive ceramic fillers dispersed in the crystalline polymer and having a volumetric resistivity less than 500 μM-cm, and comprising 40-70% by volume of the PTC material layer;
• a crystalline low-molecular weight organic compound having a molecular weight less than 5000 and comprising 6-30% by volume of the PTC material layer, the crystalline low-molecular weight organic compound having a melting temperature in the range of 70-110° C. and a melting temperature distribution range less than 20° C.;
• wherein a hold current of the PTC device at 60° C. divided by a covered area of the PTC device is greater than 0.2 A/mm2 and the hold current at 60° C. is 40-95% of a hold current at 25° C.;
• wherein the PTC device has a trip temperature less than 95° C.