The age of the varistor

The question that everyone has been discussing all the time, what is the life of the capacitor? When the varistor is normally shipped, the age of the varistor will be related to improper operation. Therefore, in order to protect the life of the varistor, everyone should use it normally.

The characteristic of the varistor is that when the voltage applied to it is lower than its threshold "UN", the current flowing through it is extremely small, which is equivalent to a closed valve. When the voltage exceeds UN, its resistance The value becomes smaller, so that the current flowing through it surges and the influence on other circuits does not change much, thereby reducing the influence of the overvoltage on the subsequent sensitive circuit. With this function, it is possible to suppress abnormal overvoltages that often occur in circuits and protect circuits from overvoltages.

The varistor can be used for 8-10 years under normal conditions. If the varistor is overloaded and exposed to high temperatures, it will reduce its useful life. Because of the aging of the varistor itself or the multiple shocks of temporary overvoltage, the leakage current of the varistor is rapidly increased, resulting in overheating damage. The varistor has a short service life and performance will decrease after multiple impacts. It needs to be replaced after long-term use.