Ptc rod assembly and preheater incorporating the same

A preheater comprising:

• a plurality of positive temperature coefficient rod assemblies interposed between and coupled with first and second housings, wherein each of the assemblies comprises:
• a positive temperature coefficient rod;
• a negative terminal and a positive terminal coupled with opposite surfaces of the positive temperature coefficient rod, the negative and positive terminals being spaced apart from and parallel to each other;
• a positive temperature coefficient element interposed between the negative and positive terminals, the positive temperature coefficient element being in electrical contact with the negative and positive terminals;
• an insulating film adhered to exposed portions of the negative and positive terminals, which are coupled with the positive temperature coefficient rod;
• and
• a positive temperature coefficient rod housing, wherein the positive temperature coefficient rod housing stores the positive temperature coefficient rod therein, the negative and positive terminals and the positive temperature coefficient element coupled with the positive temperature coefficient rod, and the insulating film adhered to the positive temperature coefficient rod;
• heat dissipation fins attached to one or both surfaces of the positive temperature coefficient rod assembly such that the heat dissipation fins are able to transfer heat;
• and
• an insulating cap formed on the first housing, wherein a longer one of the portions of the negative and positive terminals, which are exposed from the positive temperature coefficient rod housing, extends through the insulating cap.