What are the causes of breakdown of varistor

The causes of breakdown of varistor are： 

1.The number of overvoltage protection;

2. Working temperature around;

3.Whether the varistor is extruded or not;

4.Whether to pass the quality certification;

5. The surge energy is too large to exceed the absorbed power;

6.not enough voltage;

7. excessive currents and surges, etc.,     

In addition, the service life of varistor is shorter, and the performance of varistor will decline after multiple impact. Therefore, the lightning protector made up of varistor has the problem of maintenance and replacement after long time use. The varistor is a kind of limited voltage protective device, the damage of the varistor has overvoltage protection; the working temperature around it; whether the varistor is squeezed or not; whether the varistor has passed the quality certification; the surge energy is too large to exceed the absorbing power; the voltage is not enough; If the current and surge are too large, the service life of the varistor is shorter, and the performance of the varistor will decline after multiple shocks.