Metal Oxide Varistor (MOV) Disc: Clamping Voltage 180V to 1500V

Q: What is the typical lifespan of an MOV disc?

MOV discs have a finite lifespan dependent on surge exposure. Typically rated for 10-15 years under normal conditions, but may degrade faster with frequent surges. Regular testing is recommended.

Q: Can MOV discs be used in DC circuits?

Yes, MOV discs are suitable for both AC and DC applications, but voltage ratings must be selected appropriately for the specific circuit requirements.

Component Specifications

Definition

A Metal Oxide Varistor (MOV) Disc is a ceramic semiconductor component composed primarily of zinc oxide with small amounts of other metal oxides. It exhibits non-linear voltage-current characteristics, providing high resistance at normal operating voltages and low resistance during voltage surges, thereby diverting excess current away from protected circuits.

Working Principle

The MOV operates based on the grain boundary effect in its polycrystalline structure. At normal voltages, the grain boundaries present high resistance. When voltage exceeds the threshold (clamping voltage), the grain boundaries break down, creating conductive paths that allow current to flow through the component, thereby limiting the voltage across the protected circuit.

Materials

Zinc oxide (ZnO) 90-95%, with additives including bismuth oxide (Bi₂O₃), cobalt oxide (CoO), manganese oxide (MnO), and other metal oxides for grain boundary modification.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Response Time	<25 nanoseconds
Voltage Rating	130V to 1000V AC
Leakage Current	<20μA at rated voltage
Clamping Voltage	180V to 1500V
Energy Absorption	40J to 2000J
Operating Temperature	-40°C to +85°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 61643-11, UL 1449, IEEE C62.41

Parent Products

This component is used in the following industrial products

Surge Protection Device (SPD)

A protective electrical device installed in the DC input section to limit transient overvoltages and divert surge currents to ground.

View Product Details

Engineering Analysis

Risks & Mitigation

Thermal runaway under sustained overvoltage
Degradation with repeated surges
Potential short-circuit failure mode

FMEA Triads

Trigger: Repeated exposure to voltage surges exceeding energy rating
Failure: Increased leakage current leading to thermal runaway
Mitigation: Implement thermal disconnects, use MOVs with higher energy ratings, and install backup protection

Trigger: Moisture ingress or contamination
Failure: Reduced insulation resistance and premature breakdown
Mitigation: Proper encapsulation, conformal coating, and environmental sealing

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±10% voltage rating, ±20% clamping voltage

Test Method

IEC 61000-4-5 surge testing, UL 1449 third edition, impulse current testing per IEC 61643-11

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Metal Oxide Varistor (MOV) Disc

Manufacturer profiles associated with Metal Oxide Varistor (MOV) Disc.

Sourcing Metal Oxide Varistor (MOV) Disc from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

Related Components

Marking Strip

A durable marking strip used for terminal identification in motor terminal blocks to ensure proper electrical connections and safety compliance.

Gland Body

A gland body is the main housing component of an aluminum cable gland that provides mechanical protection and environmental sealing for electrical cables entering enclosures.

Current Sense Resistor

A precision resistor used to measure current flow in electrical circuits by converting current to a measurable voltage drop.

Conductor Terminal

A conductor terminal is a critical electrical component designed to securely connect and terminate conductors in high-voltage insulating bushings, ensuring reliable electrical transmission and insulation integrity.

Frequently Asked Questions

What is the typical lifespan of an MOV disc?