Refers to the resistance value of the TGE metal oxide varistor symbol voltage-sensitive resistor, that is, within a certain range of the resistance value of current and voltage with the voltage change.
Varistor resistive material is a semiconductor, so it is a variety of semiconductor resistor. "Zinc oxide" Now a lot of use of (ZnO) high voltage 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 varistor is a "Ⅱ-Ⅵ family-oxide semiconductor."
Varistors useful? "Safety valve" effect TGE varistor metal oxide circuit, its greatest feature is added on top of it when the voltage is below its threshold "UN" when the current flowing through it is extremely small, the equivalent of
A shut the valve, when the voltage exceeds UN, surge current flowing through it, is equivalent to the valve open. According to the features, it can suppress the circuit often appear abnormal over-voltage protection
Protect circuitry from overvoltage damage.
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