Varistor resistive material is a semiconductor

TGE metal oxide varistor symbol resistive material is a semiconductor, so it is a variety of semiconductor resistor. "Zinc oxide" Now a lot of use of (ZnO) varistor, it has two main material
Price element (Zn) and hexavalent elemental oxygen (O) of the composition. So from the point of view of materials, the zinc oxide metal oxide varistor basics is a "Ⅱ-Ⅵ family-oxide semiconductor."
Varistor protection, the vast majority of applications, it can repeatedly effect, but sometimes also to make it into the current fuse as a "one-off" protection device. For example, and then
On some of the short-circuit current transformer load contacts varistors. The most important feature of the TGE varistor metal oxide is added on top of it when voltage drops below its threshold "UN" when the current flowing through it is extremely small, phase
When in a shut valve, when the voltage exceeds the UN, the surge current flowing through it, is equivalent to the valve open. Using this feature, you can suppress the circuit often appear abnormal over-voltage protection
Protect circuitry from overvoltage damage.