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Resistance C Temperature (R-T) Characteristics of PTC thermistor and relative applications

The R-T Diagram plots the Resistance C Temperature Characteristics of different PTC elements.


-          A type is set as high Curie temperature PTC element whose Tc is higher than 120. The slope of the R-T is not as steep because this gives a smaller calibration of resistance changes per degree temperature change.

-          Typical application of A type PTC elements: thermal sensor, over heat protectors, motor starter and high temperature heaters.


-          B type PTC elements with Tc bellow 120 : the steep slope gives a higher resistance sensitivity in on-off situation.

-          Typical applications of this type PTC elements include: thermal sensors, over current protectors, delays and degaussers.




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