Varistor is a voltage-limiting protective electronic component with nonlinear volt-ampere characteristics. Within a certain voltage range, its resistance value decreases sharply with the increase of voltage.

It plays the role of suppressing transient overvoltage and lightning protection in the circuit. When the circuit is overvoltage, it performs voltage clamping, absorbs excess current to protect other electronic devices in the circuit, and prevents damage caused by electrostatic discharge, surge and other transient currents. cause damage to electronic devices.

Varistors have the advantages of fast response speed, various surge withstand capabilities, large flow capacity, small normal leakage current, and low residual voltage level, etc. These advantages are widely used in the protection of semiconductor electronic components such as transistors, diodes, and ICs; communications, measurement and Electric control and other electronic equipment, consumer electronics, industrial electronics, etc.

It is precisely because of these advantages of varistors that many electronic products can operate normally and work for a long time after using varistors. However, some varistors used in electronic products not only fail to protect them, but also burst, causing electronic products to malfunction. For example, three non-varistors.

We often hear three-no products in our daily life. Three-no products generally refer to products without production date, quality certificate and manufacturer.

Some unscrupulous merchants sell Sanwu products at low prices, and many people buy Sanwu products because they are greedy for petty gains. As a result, all the Sanwu products they buy have problems. Therefore, be careful not to be greedy and cheap to buy three-no products. Before buying items, you must check whether there are production dates, quality certificates, and manufacturers.

The same is true for varistors. Good varistors must have production qualifications, production dates and production inspection reports. Although the price is a bit more expensive, the quality and quality of such varistors are guaranteed. You can find sellers or manufacturers to let them solve after-sales problems.

Varistors without production qualifications, production dates, and production inspection reports are much cheaper, but the quality is worrying and cannot be guaranteed. If used in a circuit, the varistor may burst, or the circuit may burn down, causing a fire.