INDUSTRY COMPONENT

Metal Oxide Varistor

A voltage-dependent resistor used for transient voltage suppression in electrical circuits.

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Component Specifications

Definition
A Metal Oxide Varistor (MOV) is an electronic component with nonlinear resistance characteristics, primarily composed of zinc oxide and other metal oxides. It functions as a voltage-clamping device that protects sensitive electronic equipment from voltage spikes and transient surges by rapidly decreasing its resistance when the voltage exceeds a specific threshold, thereby diverting excess current away from the protected circuit.
Working Principle
The MOV operates based on the voltage-dependent resistance of its zinc oxide grains. At normal operating voltages, it exhibits high resistance (megohms), allowing minimal current flow. When a voltage surge exceeds the clamping voltage, the grain boundaries become conductive, drastically reducing resistance to milliohms, which shunts the surge current to ground and limits the voltage across the protected device.
Materials
Zinc oxide (ZnO) with small percentages of bismuth, cobalt, manganese, and other metal oxides, encapsulated in epoxy or ceramic housing with metal electrodes (typically silver).
Technical Parameters
  • Response Time <25 nanoseconds
  • Clamping Voltage 130V to 1500V
  • Energy Absorption 10J to 5000J
  • Peak Current Rating 1kA to 100kA
  • Operating Temperature -40°C to +85°C
  • Maximum Continuous Operating Voltage 85V to 1000V AC/DC
Standards
IEC 61643-11, UL 1449, ISO 9001

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Metal Oxide Varistor.

MOV surge protector voltage suppressor transient voltage zinc oxide varistor electrical protection spike protection Metal Oxide Varistor Metal Oxide Varistor in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Surge Protection Device

Electrical safety component that protects LED tunnel lights from voltage spikes and transient surges

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Engineering Analysis

Risks & Mitigation
  • Thermal runaway under continuous overvoltage
  • Degradation after multiple surges
  • Short-circuit failure mode
  • Leakage current increase over time
FMEA Triads
Trigger: Repeated surge events exceeding energy rating
Failure: Cracking or catastrophic short circuit
Mitigation: Implement redundant protection circuits and regular inspection
Trigger: Continuous overvoltage beyond maximum rating
Failure: Thermal runaway leading to fire hazard
Mitigation: Use thermal fuses and temperature monitoring

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±10% clamping voltage, ±20% energy absorption
Test Method
IEC 61000-4-5 surge immunity test, UL 1449 third edition

Buyer Feedback

★★★★☆ 4.8 / 5.0 (15 reviews)

"The Metal Oxide Varistor we sourced perfectly fits our Electrical Equipment Manufacturing production line requirements."

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"The technical documentation for this Metal Oxide Varistor is very thorough, especially regarding technical reliability."

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Frequently Asked Questions

What is the typical lifespan of a Metal Oxide Varistor?

An MOV can last 5-10 years under normal conditions, but degrades with each surge event; it should be replaced after significant surges or as part of preventive maintenance.

Can MOVs be used in DC circuits?

Yes, MOVs are suitable for both AC and DC applications, with specifications adjusted for the specific voltage and current requirements.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Metal Housing/Flange Metal Oxide Varistor (MOV)