what is varistor

A varistor is a device widely used in electronic circuits for surge suppression and voltage regulation. It is a type of resistor that has variable resistance, meaning it can change its resistance depending on the voltage applied to it. The primary purpose of a varistor is to protect sensitive electronic components and circuits from sudden voltage spikes or surges. When a voltage surge occurs, the varistor quickly becomes conductive and shunts excessive current away from the protected equipment, thereby preventing any potential damage. This makes varistors an essential component in power supplies, telecommunications equipment, consumer electronics, and industrial machinery. Varistors are designed to be compact, highly responsive, and capable of handling high-energy transients. They offer reliable protection against voltage fluctuations and help prevent costly repairs or replacements of electronic devices. With their versatile application and cost-effective nature, varistors are becoming increasingly popular in various industries, ensuring the longevity and reliability of critical electrical systems.