▎ 摘　　要

NOVELTY - Polymeric positive temperature coefficient (PPTC) heater 100 comprises heater body 104 formed of a PPTC polymer matrix comprising a conductive filler and semi-crystalline polymer. A first electrode 106 is disposed on a first side of the heater body and coupled to a first wire, and a second electrode 102 is disposed on a second side of the heater body opposite the first side and coupled to a second wire. The heater body has a first thickness measured between the first electrode and the second electrode, and a third electrode disposed on the first side of the heater body and spaced apart from the first electrode to define a gap 116 between them. The gap has second thickness greater than first thickness, where the heater body, first electrode, second electrode, and third electrode are arranged in an annular shape. USE - Polymeric positive temperature coefficient heater for temperature sensitive actuator, such as for an exhaust heat recovery system. ADVANTAGE - The polymeric positive temperature coefficient (PPTC) heater is strategically designed to have a predetermined self-regulation temperature, and has physical characteristics such as gap width and thickness, and high heat efficiency, and enable current flow to be strategically controlled. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a polymeric positive temperature coefficient (PPTC) heater. 100Polymeric positive temperature coefficient (PPTC) heater 102Second electrode 104Heater body 106First electrode 116Gap