What are Varistors?

Varistors are voltage-dependent resistive components designed to protect electronic circuits from transient overvoltage conditions. They exhibit nonlinear resistance characteristics, allowing them to absorb and clamp high-energy voltage spikes while maintaining normal operation under steady-state voltages.

Varistor performance is defined by its voltage handling capability, energy absorption, and response speed. Proper selection ensures effective protection of sensitive components, limits surge-induced stresses, and contributes to overall system reliability and longevity in both AC and DC applications.

Key Specifications

• AC Voltage Rating: Specifies the maximum alternating current voltage the varistor can withstand continuously without degradation. This rating ensures safe operation and maintains protective performance in AC circuits.
• DC Voltage Rating: Defines the maximum direct current voltage the varistor can tolerate under normal operating conditions. Proper DC voltage rating prevents premature conduction and ensures reliable protection in DC applications.
• Clamping Voltage: Indicates the voltage level at which the varistor begins to conduct and limit a transient. Clamping voltage is critical for controlling peak voltages and protecting downstream circuitry.
• Capacitance: Represents the intrinsic capacitance of the varistor, which can influence high-frequency performance and signal integrity. Capacitance is an important consideration in AC and signal-sensitive applications.

The Largest Database of Varistors

everything PE has listed Varistors from the leading manufacturers and made them searchable by specification. You can enter the key parameters and the search tool will scan catalogs from the leading manufacturers to identify products that meet your spec. Once you find Varistors that meet your requirements, you can view product information, download datasheets or request quotations. Quotation requests will be routed to the manufacturer of the product, who will get back to you directly. The quotation will also be routed to distributors of the product in your region.