PTC material is a positive temperature coefficient heat-sensitive material, which has the property that resistivity increases with increasing temperature. PTC components change their resistance very slowly with temperature until a specific temperature is reached. When this specific temperature is exceeded, the resistance of the PTC element increases sharply, and the temperature at which the resistance changes dramatically is called the Curie temperature. At the beginning, it was around 120 °C, and later it was raised to about 300 °C, and with the development of material industry technology, I heard that it can currently reach about 490 °C.
