Question: Does the ambient temperature affect the self-recovery fuse?
Answer: Self-recovery fuse can be reused for many times because its resistance can be recovered. Generally, the resistance is restored to about 1.6 times of the initial value between ten seconds and tens of seconds. At this time, the holding current of the thermistor has been restored to the rated value and can be used again. Generally speaking, thermistors with smaller area and thickness recover quickly, while thermistors with larger area and thickness recover slowly.
Self-recovery fuse is a kind of direct heating and step thermistor, and ITs resistance change process is related to its own heating and heat dissipation, so its holding current IH, operating current it and operating time are affected by ambient temperature.
When the ambient temperature and current are in zone A, the heating power of thermistor is greater than the cooling power. When the ambient temperature and current are in zone B, the heat dissipation power of the thermistor is close to the heating power, so it may not move. When the ambient temperature and current are in zone C, the heating power is less than the heat dissipation power, and the thermistor will remain inactive for a long time.
