Keeping PTC thermistors in SMD/SMT 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 85°C. PTC thermistors have terminations of 2. When operating, PTC thermistors could deliver a voltage of 24V. In order to design PTC thermistors for 10A current, they must have a negative voltage. A PTC thermistor should produce 600mW heat.