1. The thermistor will not work for a long time; When the ambient temperature and current are in zone C, the heat dissipation power of the thermistor is close to the heating power, so it may or may not act.

2. When the ambient temperature is the same, the action time of thermistor will be shortened sharply with the increase of current; When the ambient temperature is relatively high, the working time of thermistor is short, and the holding current and working current are small.

Function:

1, temperature measurement. As a thermistor sensor for measuring temperature, it is generally simple in structure and low in price;

2. Temperature compensation. Thermistor sensor can compensate the humidity of some components in a certain temperature range;

3. Overheating protection. When the temperature is greater than the catastrophe point, the current in the circuit can suddenly change from tens of milliamps to tens of milliamps, so the relay acts to realize overheating protection.