Working Of Varistor

A varistor is a type of electronic component that plays a key role in protecting various electrical devices and systems from voltage surges or high transient voltages. It is commonly used in power distribution systems, telecommunications equipment, consumer electronics, and many other applications. The working of a varistor is based on its nonlinear voltage-current characteristics. It is made up of a semiconductor material, typically zinc oxide, which has a high resistance at low voltages but rapidly decreases its resistance when a high voltage is applied. When a voltage spike or transient voltage occurs, the varistor quickly conducts the excess current, diverting it away from the sensitive components and preventing damage. One of the key advantages of varistors is their fast response time, as they can activate within nanoseconds to clamp the excessive voltage. They are available in different voltage ratings to match specific application requirements, and their compact size allows for easy integration into various electronic circuits. In summary, varistors serve as an essential component in safeguarding electrical devices and systems from voltage surges. Their rapid response time and ability to absorb transient voltages make them an indispensable tool in modern electronics.