varistoreissa

Varistor, short for variable resistor, is an electronic component that exhibits a non-linear, current-dependent resistance. It is designed to protect circuits from transient voltage surges by limiting the voltage across the device to a predetermined level. Varistors are typically made from zinc oxide or silicon carbide and are characterized by their voltage-current (V-I) characteristics, which show a steep increase in resistance as the voltage exceeds a certain threshold.

The primary function of a varistor is to provide surge protection by diverting excess voltage away from sensitive components in a circuit. This is achieved through the varistor's non-linear resistance, which increases significantly when the voltage exceeds its breakdown point. Varistors are commonly used in power supplies, telecommunications equipment, and other applications where protection against voltage spikes is crucial.

Varistors are available in various types, including metal oxide varistors (MOVs), silicon carbide varistors, and polymer varistors. Each type has its own set of characteristics and applications. MOVs, for example, are widely used due to their high energy absorption capability and fast response time. Silicon carbide varistors, on the other hand, offer better performance at higher temperatures and are often used in high-voltage applications.

In summary, varistors are essential components in modern electronics, providing reliable protection against voltage surges and ensuring the longevity and stability of electronic circuits. Their non-linear resistance and ability to absorb and dissipate energy make them indispensable in various industries and applications.