ZnO varistor blocks are the core nonlinear components of modern metal oxide surge arresters (MOA). They are responsible for absorbing lightning and switching overvoltages and protecting power systems from insulation failure.
Our ZnO varistor blocks cover a full voltage range from 0.28kV distribution level up to 1000kV transmission level, making them suitable for low-voltage, distribution, substation, and ultra-high voltage surge arrester applications.
Compared with traditional silicon carbide (SiC) resistors, ZnO MOV technology provides:
- Strong nonlinear V-I characteristics
- Extremely low leakage current
- Fast response to surge impulses
- Higher energy absorption capability
- Long-term operational stability
Voltage Application Range
Our ZnO varistor blocks are used in:
- 0.28kV – 1kV Low voltage surge arresters
- 3kV – 35kV Distribution class arresters
- 66kV – 220kV Substation arresters
- 330kV – 1000kV Transmission line arresters
Available Disc Sizes
We manufacture ZnO varistor discs in multiple diameters to match different energy and voltage requirements:
- 32 mm
- 38 mm
- 42 mm
- 48 mm
- 56 mm
- 62 mm
- 75 mm
- 84 mm
- 100 mm
- 110 mm
- 128 mm
Each size is selected based on energy absorption requirement, leakage current grade, and arrester design voltage.
Key Features
High Nonlinear Electrical Performance
Our MOV blocks ensure very low leakage current at normal voltage and rapid resistance collapse during surge events.
High Energy Absorption Capability
Designed to withstand:
- 4/10 μs high current impulse
- 2 ms long duration discharge wave
- Repetitive surge conditions in real grid environments
IEC 60099-4 Compliant Manufacturing
All ZnO varistor blocks are designed and tested according to IEC 60099-4 standard for surge arresters.
Stable Aging Performance
Verified by long-term accelerated aging tests ensuring consistent performance in field operation.
Grading and Matching Control
Each batch is strictly sorted by:
- U1mA voltage
- Leakage current
- Nonlinear coefficient
Ensuring consistent performance for stacked column assembly.
Custom Column Assembly (OEM Service)
We provide pre-matched ZnO varistor stacks (columns) for surge arrester manufacturers.
This includes:
- Voltage grading selection
- Leakage current matching
- Stack assembly for polymer or porcelain housings
- Ready-to-mold MOV core kits
👉 Eliminates need for in-house sorting and testing equipment
👉 Reduces production cost and assembly time
Applications
ZnO varistor blocks are widely used in:
- Metal oxide surge arresters (MOA)
- Polymer housed arresters
- Porcelain arresters
- Power transmission systems
- Substations and switchyards
- Wind and solar power systems
- Railway electrification systems
- Industrial power protection systems
Why Choose Our ZnO Varistor Blocks
- 30+ years manufacturing experience
- Full voltage range supply (0.28kV–1000kV)
- Strict quality grading system
- Stable batch consistency
- OEM / ODM support for arrester manufacturers
- Global export experience
Technical Standard Compliance
- IEC 60099-4
- IEC 60815 (related insulation coordination)
- IEEE arrester application standards (optional OEM adaptation)
Inquiry Information Required
To provide accurate quotation, please send:
- Rated arrester voltage
- Disc diameter requirement
- Energy class / discharge requirement
- Application type (distribution / substation / transmission)
- Quantity
Looking for ZnO Varistor Blocks for Surge Arrester Production?
Contact us for technical datasheet, pricing and OEM support within 24 hours.
