PTC Thermistor

APPLICATIONS : As a temperature controller there are two typical applications of PTC thermistors. One is for a self heating and the other is for a heat sensing element. The typical examples of use as a self heating element are, heater, thermostat etc. and popular examples where PTC thermistors are exclusively used as heat sensing elements are a.c. induction motor over heat protectors, water cooled engine overheat warning degaussing coil of Colour TV etc.
PTC thermistors can also be used for monitoring changes in environment such as liquid level sensing, air flow indication and as current limiters

Positive temperature coefficient of resistivity anomaly at the critical temperature in these devices has opened up numerous avenues of practical applications in the area of temperature control and heat protection. Because of their very high temperature coefficient of resistivity (> 25 ohms / ^o  C)  PTC thermistors are quite superior and more efficient than NTC thermisistors for above applications.