Surge Arrester Components

ZnO Varistor Blocks | Surge Arrester Components

We manufacture ZnO varistor blocks (surge arrester discs) for OEMs, substations, and distribution lines. Available from low voltage (0.28kV) to UHV (1000kV). IEC 60099-4 compliant.

Voltage & Diameter Selection Guide

Voltage ClassTypical UseDisc DiameterEnergy Class
0.28kV–3kVLow voltage SPDØ32mm–Ø42mmStandard
3kV–36kVDistribution arresterØ42mm–Ø56mmStandard / High
36kV–220kVStation classØ56mm–Ø84mmHigh
220kV–1000kVUHV multi-columnØ100mm–Ø128mmHigh

FAQ – ZnO Varistor Blocks

Q: What is the difference between standard and high energy class varistor blocks?
A: Standard class (100–150 J/cm³) for general distribution. High energy class (200–300 J/cm³) for severe lightning areas or critical substations.

Q: Can I buy varistor blocks separately from surge arresters?
A: Yes. We supply varistor blocks for OEM replacement, maintenance, and custom arrester assembly.

Q: Do you offer custom diameter or leakage current control?
A: Yes. Tight leakage current ≤5μA available. Custom diameters on request.

Need varistor blocks for your project?

Tell us: Voltage class / Diameter / Energy class / Quantity
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