Keeping PTC thermistors in Radial packages prevents them from being damaged. Ensure that the PTC thermistors are set to -40°C as their minimum operating temperature. In order for this thermistor to work properly, the operating temperature must not exceed 125°C. PTC thermistors have terminations of 2. A thermistor like this has 2 pins. When operating, PTC thermistors could deliver a voltage of 265V. In order to design PTC thermistors for 2.2A current, they must have a negative voltage. The DC circuit uses thermistors with a 265V voltage rating. Ildeally, PTC thermistors should operate at no more than 2.2A current. A reliable performance can be achieved by using a thermistor that supplies a maximum voltage of 265V.