Voltage Sensitive Resistor

A Voltage Sensitive Resistor (VSR), also known as a Varistor, is a type of resistor that exhibits a non-linear voltage-current characteristic. It is commonly used in electrical and electronic equipment components to protect sensitive circuits from voltage surges or transients.

VSRs are designed to have a high resistance at normal operating voltages, effectively blocking any current flow. However, when the voltage exceeds a certain threshold, the resistance of the VSR decreases rapidly, allowing current to flow through it and diverting the excess voltage away from the protected circuit.

The primary function of a VSR is to provide overvoltage protection by clamping the voltage to a safe level. This helps prevent damage to sensitive components such as integrated circuits, transistors, and other electronic devices. VSRs are commonly used in power supplies, surge protectors, voltage regulators, and other electrical equipment to ensure the safety and reliability of the circuitry.

It is important to select the appropriate VSR with the correct voltage rating and energy absorption capability for the specific application. This ensures that the VSR can effectively protect the circuit from voltage spikes and transients, thereby extending the lifespan of the equipment and preventing costly repairs or replacements.

In summary, Voltage Sensitive Resistors are essential components in electrical and electronic equipment, providing overvoltage protection by clamping excessive voltages and safeguarding sensitive circuits from damage.