NTC Thermistors FAQQ[NC* Series] Is the maximum operating voltage derating curve graph the maximum voltage that can be applied at each temperature?

The maximum operating voltage is the voltage at which the self-heating becomes 0.1°C when applied to the NTC thermistor alone.
Since self-heating affects the accuracy of temperature detection, we recommend that you use the product at a voltage lower than the maximum operating voltage shown in the graph in order to use the product at temperatures lower than 0.1°C self-heating.