In order to protect the PTC thermistors from damage, they are packaged in Radial packages. ldeally, the PTC thermistors should operate at -25°C. There must be no temperature above 125°C for this thermistor to function. In this thermistor, there are 2 pins. During normal operation, this thermistor supplies 220V voltage. For PTC thermistors, 420mA is the current.