A varistor is a resistive device with nonlinear volt-ampere characteristics. It is mainly used to clamp the voltage when the circuit is under overvoltage, and to absorb excess current to protect sensitive devices. Nowadays, the varistor is widely used, and its main material is composed of a divalent

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 respon

A varistor is an electronic component that prevents excessive voltage and protects the board from high voltage surges. The resistor material of the varistor is a semiconductor, and thus is also a type of semiconductor resistor. The zinc oxide varistor is now commonly used. There is a key parameter i

1. Working properties of varistorIn order to meet the space size requirements of equipment miniaturization and meet the needs of functional upgrades, the working principle of varistor is high impedance when there is no transient overvoltage. However, as the surge current and voltage increase, its im

1. Working environment of varistor:Should be within the scope of the technical conditions:Ambient temperature: -40C ~ +85 °C;Relative humidity: up to 96% at +40±2°C;Atmospheric pressure: up to 8.5KPa. 2. Selection of varistor voltageSelect according to the power supply voltage. Taking full account o

Varistors can be easily used in series. The method is that after the varistor of the two resistor bodies having the same diameter and the same flow rate are connected in series, the varistor voltage is added at the continuous working voltage and the limiting voltage, so that the flow rate index does

The use of varistor in different situations has different effects, so the requirements for varistor are also different. We need to pay attention to this problem when choosing, and use varistor correctly. The varistor can be classified into a varistor for protection and a varistor for circuit functio

The main parameters of varistor are nominal voltage, voltage ratio, control voltage, residual voltage ratio, current capacity, leakage current, voltage temperature coefficient, current temperature coefficient, voltage nonlinear coefficient, insulation resistance, static capacitance and so on. Genera

1. The performance of varistor(1) The varistor is a non-linear resistance element mainly composed of zinc oxide. The surge current tolerance and nonlinear coefficient of the device are very large. When the threshold voltage is lower than the threshold voltage, the resistance is very high, and almost

1. Test method of varistor:(1) First need to know the voltage value of the varistor, you can use a suitable voltage source (the voltage source here can be a common power supply; the protection resistor can avoid excessive current, damage varistor or power supply) in series with a protection The resi