PTC Thermistor (Positive Temperature Coeffieicient Thermistor) is a kind of oxide semiconducting ceramics which is made from barium titanate as the main materials.
　　 Be provided with a notable property,PTC’s resistance can be increased rapidly above the switching temperature,and it’s resistance can be return to the original state when the temperature down to under the switching temperature.
　　 The switching temperature:the point of resistance rapid change temperature,it can be free set in the range from -50℃ to 300℃ according to the application by the raw material.
　　 The resistance at 25℃ can be set from 10Ω·cm to 50kΩ·cm with slight differences according to the switching temperature.
　　 Now,PTC Thermistor has been used to a wide range of constant temperature heaters,current limiting element,and temperature sensors, Motor Starter, Degaussing Circuit,…