<h1>ZnO Varistor Blocks Manufacturer | Surge Arrester Resistor Discs | ASIAPOWER</h1>

⚡ IEC 60099-4 · IEEE C62.11

Surge Arrester Resistor Disc (ZnO Varistor Blocks)

High energy absorption · Low leakage current · Excellent thermal stability · IEC compliant

📩 Send Your Requirements Technical Overview

ZnO Varistor Blocks - Surge Arrester Resistor Disc

ZnO MOV Blocks | Ø32mm–Ø128mm | 3kV–1000kV

Key Features of ZnO Varistor Blocks

Engineered for superior overvoltage protection and long-term reliability

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High Energy Absorption Capability

Up to 300 J/cm³ energy handling. Suitable for severe lightning and switching surge environments.

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Low Leakage Current

≤5µA at 0.75 V₁ₘₐ, typical ≤2µA. Minimises thermal runaway risk and extends arrester life.

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Stable Nonlinear Coefficient (α)

α value > 40 ensures excellent clamping performance and consistent protection level.

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Excellent Thermal Stability

Wide operating temperature -40°C to +85°C, with low degradation under repeated surges.

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IEC Standard Compliant Manufacturing

Full compliance with IEC 60099-4, IEEE C62.11. Third-party test reports available.

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OEM / ODM Customization

Custom voltage gradient, diameter, and energy rating to meet your specific arrester design.

Available ZnO Varistor Block Sizes & Voltage Ratings

📐 0.28 kV · 3 kV · 6 kV · 10 kV · 20 kV · 35 kV · 66 kV · 110 kV · 220 kV · 330 kV · 500 kV · 750 kV · 1000 kV

Ø32mm Ø38mm Ø42mm Ø48mm Ø56mm Ø62mm Ø75mm Ø84mm Ø100mm Ø110mm Ø128mm

Applications of ZnO Varistor Blocks

Engineered for medium voltage, high voltage and ultra-high voltage surge arrester applications.

⚡ 11kV Distribution Surge Arresters

⚡ 24kV Distribution Surge Arresters

⚡ 33kV Polymer Surge Arresters

⚡ 66kV Station Class Arresters

⚡ 110kV Transmission Line Arresters

⚡ 220kV–1000kV EHV & UHV Arresters

Surge Arrester Accessories: Disconnector & Mounting Bracket

Reliable components for complete surge arrester / lightning arrester assembly

Disconnector

Designed for surge arrester and lightning arrester applications. Provides clear fault indication and isolates a failed arrester from the system, preventing prolonged short-circuit faults.

✓ Low transient overvoltage
✓ Hermetically sealed, IP67 option
✓ Compatible with ASIAPOWER resistor discs
✓ IEC 60099-4 compliant

Mounting Bracket

Heavy-duty galvanized bracket for secure installation of surge arresters on poles, walls, or substation structures. Minimises mechanical stress and ensures stable alignment.

✓ Hot-dip galvanized / stainless steel optional
✓ Custom hole patterns available
✓ Withstands high mechanical loads

✅ Ask about our complete package — resistor discs + disconnector + bracket, ready for OEM assembly.

Frequently Asked Questions

❓ What is ZnO varistor block used for?

ZnO varistor blocks are the core components inside metal-oxide surge arresters (also known as lightning arresters). They clamp overvoltages by changing from high resistance to low resistance during lightning or switching surges, protecting transformers, lines, and substations.

❓ What is the lifespan of resistor discs?

Under normal operating conditions (within rated voltage and surge duty), ASIAPOWER resistor discs have an expected life of over 30 years, with low degradation and stable leakage current throughout service life.

❓ Can you customize energy rating?

Yes. We offer OEM/ODM customization of energy absorption capability (up to 300 J/cm³), voltage gradient, diameter, and even special coating requirements. Just provide your technical specification.

❓ Do you provide samples for testing?

Yes, free samples are available for qualified projects. Please contact us with your application details and expected annual volume.

❓ What is a ZnO varistor block?

A ZnO varistor block is the core nonlinear resistor element inside a metal oxide surge arrester. It provides overvoltage protection by rapidly switching from high resistance to low resistance during surge events.

❓ What is the difference between ZnO varistor blocks and silicon carbide blocks?

ZnO varistor blocks offer superior nonlinear characteristics, higher energy absorption capability and lower residual voltage compared with traditional silicon carbide technology.

❓ What standards apply to ZnO varistor blocks?

Our products are manufactured according to IEC 60099-4 and applicable IEEE surge arrester standards.

❓ How do I select the correct varistor block size?

Selection depends on voltage class, energy requirement, arrester housing design and protection level requirements.

❓ Can you customize voltage gradient and dimensions?

Yes. Custom voltage gradient, diameter, thickness and energy class are available for OEM surge arrester manufacturers.

❓ What test reports are available?

Routine electrical tests, leakage current tests, energy absorption tests and type test reports can be provided upon request.

ASIAPOWER