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Oil Spout ABS Lift Toggle

Oil Spout ABS Lift Toggle

Oil spout ABS Lift Toggle A "varistor" is a resistive device with nonlinear volt-ampere characteristics that is used to clamp a voltage when the circuit is subjected to an overvoltage, absorbing excess current to protect sensitive components. The English name is “Voltage Dependent Resistor” and...

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Oil spout ABS Lift Toggle



A "varistor" is a resistive device with nonlinear volt-ampere characteristics that is used to clamp a voltage when the circuit is subjected to an overvoltage, absorbing excess current to protect sensitive components. The English name is “Voltage Dependent Resistor” and is abbreviated as “VDR” or “Varistor”. The resistor material of the varistor is a semiconductor, so it is a variety of semiconductor resistors. A "zinc oxide" (ZnO) varistor, which is currently used in large quantities, is composed of a divalent element zinc (Zn) and a hexavalent element oxygen (O). Therefore, from the material point of view, the zinc oxide varistor is a "II-VI oxide semiconductor". In Taiwan, varistors are called "surge absorbers" and are sometimes referred to as "electric shock (surge) suppressors (absorbers)".
The varistor is a voltage limiting type protection device. Using the non-linear characteristics of the varistor, when an overvoltage occurs between the two poles of the varistor, the varistor can clamp the voltage to a relatively fixed voltage value, thereby protecting the latter circuit. The main parameters of the varistor are: varistor voltage, current capacity, junction capacitance, response time and so on.
The response time of the varistor is ns, which is faster than the gas discharge tube and slightly slower than the TVS tube. Under normal circumstances, the overvoltage protection for the electronic circuit can meet the requirements. The junction capacitance of a varistor is generally in the order of several hundred to several thousand Pf. In many cases, it should not be directly applied to the protection of high-frequency signal lines. When it is used in the protection of an AC circuit, it will increase leakage due to its large junction capacitance. The current needs to be fully considered when designing the protection circuit. The varistor has a large flow capacity but is smaller than a gas discharge tube. The varistor, abbreviated as VDR, is a voltage-sensitive nonlinear overvoltage protection semiconductor component.

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