A Varistor is a voltage-dependent, non-linear resistor whose resistance changes significantly with applied voltage. The term varistor is derived from “variable resistor”, but unlike potentiometers or rheostats, its resistance varies automatically with voltage, not mechanically. Varistors are primarily used for over-voltage protection. Under normal operating voltage, a varistor behaves like a very high resistance device. […]
Understanding the difference between Surge Protection and Over Voltage Protection is essential for designing robust electronic systems, selecting the right protective components, and complying with safety and EMC standards. Modern electronic and electrical systems are increasingly sensitive to abnormal voltage conditions. With the widespread use of microcontrollers, SMPS power supplies, communication modules, and semiconductor devices, […]