PTC Components
     The R-T chart below descrips main characters of PTCR. R-T stands for the relations between zero resistance and temperature of PTC.Initially,resistance falls when temperature goes up (NTC character). Later on ,it would soar up with temperature(PTC character). At last, when it past the MAX Resisitance Value,the resistance would return to NTC status.The PTC phenomenon is evoked by ferroelectric phase transition.
Chart：

Tc – Curie Temperature：the starting point of PTC semi-conducting ceramic transition.Usually it is the corresponding temperature to twice value of Rmin
Tmax – Max temperature- the maximum temperature of PTC component；
Tp – Max work temperature-the uper limit of work temperature；
Tmin – Min Temperature, the temperature corresponding to min. resistance value；
T25 – standard room temperature 25℃；
Rc – switch resistance – the resistance corresponding to curie temperature
Rmax – Max resistance corresponding to max temperature；
Rp – Max work resistance corresponding to uper limit of work temperature;
Rmin – Min resistance- the minimum resistance of PTC under normal conditions;
R25 – Resistance under standard room temperature