PTC thermistor working principle: thermistor will not operate 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. When the ambient temperature of the thermistor is the same, the action time decreases sharply with the increase of current; When the ambient temperature is relatively high, the thermistor has a shorter action time and smaller maintenance current and action current.

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