INDUSTRY COMPONENT

Metal Oxide Varistor (MOV) Disc

A voltage-dependent resistor component used in surge protection devices to protect electrical equipment from voltage spikes and transients.

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

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Metal Oxide Varistor (MOV) Disc.

MOV disc metal oxide varistor surge protector voltage suppressor transient protection electrical protection component SPD component Metal Oxide Varistor (MOV) Disc Metal Oxide Varistor (MOV) Disc in Electrical Equipment Manufacturing

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.

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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

Interchangeable Parts

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

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

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.

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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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Metal Oxide Varistor (MOV) Meter Mounting Rails