Copper Bonded Lightning Arrestor
Product Overview
A lightning strike gives a building no warning and no second chance, which is why the arrestor on the roof needs to work exactly as designed, every time, for years without attention.
Thunder Earthing, a reliable earthing system manufacturer, supplies a copper bonded lightning arrestor built from high-quality copper bonded steel molecularly bonded onto a high-tensile steel core — the steel gives the air terminal the mechanical strength to stay mounted through wind and weather, and the copper gives it the conductivity to intercept a strike and carry it safely away.
It’s the arrestor most commercial and residential buildings actually need: dependable, standards-compliant lightning protection at a fraction of the cost of an active ESE system, and the right fit for structures where a single, well-positioned air terminal covers the protected area without needing the extended radius an ESE system is built for.
How a copper bonded lightning arrestor works
The design follows the Franklin Rod principle — a passive lightning protection method with over 270 years of documented use. The sequence is straightforward: electrical charge builds in storm clouds, the copper air terminal mounted at the building’s highest point offers lightning a preferred strike point, and the strike current is then carried down through a dedicated down conductor into the earthing system below, keeping the discharge away from the structure and everything inside it.
The copper bonding process is what separates a well-built arrestor from a cheap one. Rather than plating a thin copper film onto the steel, molecular bonding deposits the copper layer directly onto the surface at the atomic level, so there’s no separate coating to crack, peel, or wear through at the tip or the mounting threads — the two points that take the most physical stress during and after installation.
Copper bonded vs pure copper lightning arrestor
|
Pure copper arrestor |
Copper bonded arrester |
|
|
Construction |
Solid 99.9% electrolytic copper throughout |
Copper layer molecularly bonded to a high-tensile steel core |
|
Conductivity |
Maximum — no steel core to limit current flow |
High, but slightly below solid copper |
|
Corrosion resistance |
Excellent in all conditions, including saline and acidic air |
Excellent, protected by the bonded copper surface |
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Cost |
Higher |
Mid-range |
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Best suited for |
Coastal sites, chemical and process industries, installations where maximum performance is non-negotiable |
Most commercial and industrial rooftops, standard lightning protection requirements |
For the large majority of installations, copper bonded is the right call — it meets the same protection standards as solid copper at a materially lower cost. Solid copper earns its premium on sites where corrosion conditions are genuinely severe; see our pure copper lightning arrestor page for that comparison.
Specification Table
| Specification | Details |
|---|---|
| Material | Copper Bonded Steel |
| Diameter | 12 mm, 14 mm, 17.2 mm, 20 mm, 25 mm |
| Length | 1 Meter to 3 Meter (Customizable) |
| Number of Points | 4, 5 or 6 (As per requirement) |
| Base Type | Plate Base / Rubber Base / Flange Base / Bolt Type Base |
| Finish | Copper Bonded |
| Standards | IS 3043 / IEC 62305 |
| Application | Lightning Protection System |
Available Base Types
To accommodate different installation requirements, Thunder Earthing offers copper bonded lightning arrestors with multiple mounting options:
- Plate Base – Suitable for standard rooftop and masonry installations.
- Rubber Base (Heavy Duty) – Provides stable mounting on flat surfaces and demanding environments.
- Flange Base – Designed for installation on structural steel members and industrial structures.
- Bolt Type Base (Heavy Duty) – Ensures secure anchoring for heavy-duty and high-wind applications.
Why the copper bonding matters for corrosion resistance
When exposed to air, copper will oxidize naturally, forming a protective layer called patina, thereby contributing significantly to the longevity of copper bonded lightning arresters when used in the outside environment of rooftop installations.
Even though natural weather factors such as salt spray at the shorelines, industrial acidic atmosphere, and humid weather conditions intensify corrosion for untreated steel and galvanized elements, a bonded copper surface will corrode similarly at a much lower pace than counterpart materials.
This is essentially the logic behind the use of copper bonding instead of cheaper painted material, namely, that it is the coating that should endure years of the exposure to harmful elements.
Where a copper bonded lightning arrestor is used
- Residential buildings, 1–3 storeys
- Commercial complexes and office buildings
- Factories, warehouses, and industrial plants
- Power substations and transformer yards
- Telecom towers
- Rooftop solar installations and solar farms
- Wind turbine structures
Why choose Thunder Earthing
We supply copper bonded lightning arrestors alongside our full earthing and lightning protection range — copper bonded rods, GI electrodes, ESE lightning arresters, and backfill compound — so a project can specify its entire lightning protection system, from air terminal to copper bonded earthing electrode, through one supplier instead of coordinating separate vendors for each component.
We supply pan-India, directly to electrical contractors, EPC companies, consultants, and project owners, with full documentation for project compliance records. If you’re unsure whether a conventional copper bonded arrestor or an ESE system is the better fit for your site, we can talk through the protection radius and installation trade-offs before you commit to a design.
FAQs
What is a copper bonded lightning arrestor?
It’s a passive lightning protection device with a copper air terminal molecularly bonded to a steel core, designed to intercept a lightning strike and carry it safely to an earthing system.
How is it different from a pure copper lightning arrestor?
A copper bonded arrestor uses a steel core with a bonded copper surface for cost efficiency and strength. A pure copper arrestor is solid copper throughout, offering slightly higher conductivity and corrosion resistance at a higher cost.
Which diameter should I choose?
Copper bonded lightning arrestors are available in 12 mm, 14 mm, 17.2 mm, 20 mm, and 25 mm diameters. The appropriate size depends on the structure, protection requirements, and project specifications. Our team can recommend the right option based on your application.
Where can a copper bonded lightning arrestor be installed?
It suits homes (1 to 3 storeys), commercial complexes, factories, warehouses, substations, telecom towers, rooftop solar plants and wind turbine structures.
Does it need a separate earthing system?
Yes — the arrestor intercepts the strike, but the current still needs a properly designed earthing system to dissipate safely into the ground. The arrestor, down conductor, and earthing electrode should be specified as one system.