Varistors
Why do varistors have a limited lifespan?
The Varistors can wear out over time, especially when exposed to frequent and high-energy surge events. This wear is due to varistor’s ability to dissipate excess energy leading to gradual degradation.
Can varistors protect against lightning strikes?
The Varistors can provide some level of the protection against lightning-induced surges but are often used in conjunction with the other surge protection devices.
Do varistors consume power when they are not conducting?
The Varistors typically have a low leakage current when they are not conducting. While this current is minimal and it may result in a slight power dissipation but it is generally negligible in the most applications.
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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