What is a Varistor?
A varistor is an electronic component that protects electrical circuits against overvoltage. Because its electrical resistance varies with applied voltage, it is commonly referred to as a voltage-dependent resistor (VDR). Surge protection devices often use varistors to protect sensitive electronics and equipment from voltage spikes and transient voltage occurrences.
Need for Varistors?
The Varistors evolved in response to the need for effective surge protection in electronic circuits. As electronic devices became more prevalent and delicate, they became susceptible to damage from voltage spikes and surges. The varistors were developed to provide a cost-effective and reliable means of voltage clamping and transient suppression ensuring the safety and functionality of the electronic equipment.
What are Varistors ?
A Varistor is an electronic component designed to protect electrical circuits from excessive voltage surges or transients. It is a nonlinear resistor whose electrical resistance varies significantly with changes in voltage. Varistors are commonly used to safeguard sensitive electronic devices and equipment by diverting excess voltage away from them.
Varistors are frequently employed in parallel with the devices or circuits they are designed to safeguard. When there is a voltage spike, the varistor effectively “clamps” the voltage at a safe level, keeping it from reaching the protected components. The varistor recovers to its high-resistance state after the surge has passed.
Table of Content
- Definition
- Varistor Symbol
- Packages
- Construction of Varistor
- Types of Varistor
- Operation and Characteristics Graph
- Properties of Varistors
- Characteristics of Varistors
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