Varistor Definition

A varistor is a versatile electronic component used to protect sensitive electrical and electronic circuits from voltage surges and transient over-voltages. It is a type of resistor that behaves like a non-linear voltage-dependent resistor, meaning it offers high resistance at low voltages and low resistance at high voltages. Varistors are made from a semiconductor material, usually metal oxide, and are capable of rapid response to transient voltage spikes, resulting in immediate clamping of the voltage to a safe level. This ensures the protection of valuable equipment and sensitive components within a circuit. Varistors are commonly used in devices such as power supplies, surge protectors, telecommunication equipment, and automotive applications. They provide reliable protection against transient events caused by lightning strikes, power surges, and other voltage disturbances. Overall, varistors serve as essential components in safeguarding electrical systems. Their ability to absorb and dissipate excess voltage while maintaining circuit integrity makes them indispensable for ensuring the longevity and reliability of sensitive electronics.