Varistors, specifically Metal Oxide Varistors (MOVs), are essential components in circuit protection, designed to suppress voltage spikes and transient surges. MOVs consist of a ceramic disc with a metal oxide layer that exhibits nonlinear resistance characteristics. When exposed to overvoltage conditions, MOVs conduct significantly, diverting excess current away from sensitive electronic components. Varistors and MOVs are widely used in power supplies, electronic equipment, and surge protection devices to safeguard against damage from electrical disturbances. Basic varistors with lower voltage and current ratings are generally more affordable. High-performance MOVs with higher voltage ratings, higher energy absorption capabilities, and faster response times may command higher prices. When purchasing these components, determine the voltage and energy transient levels that the varistors/MOVs will be exposed to in your application to select components with suitable ratings. Consider factors such as clamping voltage, energy absorption capacity, and response time for effective surge protection.