LIGHTNING & SURGE PROTECTION
In an era of increasing reliance on sensitive electronic equipment, protecting your infrastructure from the catastrophic effects of lightning strikes and transient overvoltages is a critical necessity. At Demesne Electrical, we provide a comprehensive range of lightning and surge protection solutions designed to safeguard industrial, commercial, and residential installations across Ireland.
Our primary partnership with DEHN, a global leader in lightning protection and earthing technology, allows us to offer world-class devices that comply with the highest international safety standards, including IEC 62305 and EN 61643. Whether you are protecting a large-scale industrial plant or a modular control cabinet, our stock includes everything from high-capacity Type 1 lightning arresters to precision Type 3 surge protection for terminal equipment.
Understanding the Protection Hierarchy
Effective lightning protection requires a coordinated, multi-stage approach to ensure "system availability" and prevent equipment failure:
Type 1 (Class I) - Lightning Current Arresters: Installed at the service entrance to protect against direct lightning strikes and high-energy surges.
Type 2 (Class II) - Surge Arresters: Positioned in distribution boards to mitigate induced surges from indirect strikes or switching operations.
Type 3 (Class III) - Device Protection: Final-stage protection for sensitive electronics such as PLCs, computers, and telecommunications equipment.
By integrating these with our robust industrial enclosures and high-quality cables, you create a resilient barrier against electrical transients. For installations requiring high mechanical security, we also provide stainless steel enclosures that offer superior protection in harsh Irish environments.
Technical Expertise and Support
As Ireland's premier distributor of control and automation components, we don't just supply parts—we provide expertise. Our DEHN range includes innovative technologies like the BLITZDUCTOR XT for signal lines and DEHNguard modular arresters with visual fault indicators. To maintain a safe and compliant system, ensure all protection devices are secured using our DIN rail terminals and identified clearly with our cable markers and labels."
DEHNventil Type 1,2 & 3 Combined Lightning Current and Surge Arresters
- Combined Type 1, 2 & 3 protection Complete lightning and surge protection in a single coordinated device.
- Very high lightning current discharge capacity Designed for installations exposed to direct lightning strikes.
- Outstanding follow current limitation Prevents nuisance tripping and maintains system availability.
- Suitable for high prospective short-circuit currents Ideal for service entrances and demanding network conditions.
DEHNrail Type 3 Surge Arresters
- High discharge capacity due to heavy-duty zinc oxide varistor / spark gap combination
- DEHNrail 2-Pole and 4-pole Modular devices.
- Operating state / fault indication by green / red indicator flag in the inspection window
- Dedicated Type 3 protection Final-stage surge protection for sensitive terminal equipment.
- Compact DIN rail mounting Ideal for control panels, cabinets, and distribution boards.
DEHNventil Type 1,2 and 3 Combined Lightning Current and Surge Arresters with integrated backup fuse
- Integrated backup fuse
- High lightning current capacity Handles up to 25 kA (10/350 µs), suitable for high-exposure installations.
- Low protection level Up ≤ 1.5 kV, including the backup fuse, helping protect downstream terminal equipment.
DEHNshield Type 1,2 and 3 Combined Lightning Current and Surge Arresters
- All-in-one Type 1, 2 & 3 protection
- High lightning current discharge capability Suitable for installations exposed to direct lightning currents.
- Maximum system availability Advanced follow current limitation minimises nuisance tripping and downtime.
- Energy coordination built in Designed to work seamlessly with other DEHN surge protection devices.
DEHNguard Type 2 and 3 Surge Arresters
- Type 2 & Type 3 surge protection Ideal for protection against induced surges and switching overvoltages.
- Low protection levels Reduces stress on downstream equipment and extends service life.
- Fast response characteristics Effective protection for sensitive electronic and control systems.
DEHNguard Type 2 and 3 Surge Arresters with integrated backup fuse
- Integrated backup fuse Eliminates the need for an external fuse, reducing components and wiring.
- Space-saving design Ideal for compact LV distribution boards and control panels.
- Type 2 & Type 3 surge protection Protects against switching surges and transient overvoltages.
DEHNrapid Type 1 Surge Arresters for Telecommunications
- Type 1 surge protection for telecom lines Designed to handle direct lightning currents on communication systems.
- High lightning current discharge capacity Suitable for exposed installations and outdoor line entry points. Protection of critical communication infrastructure
- Fast response characteristics Effective protection for sensitive data and signal circuits.
- Energy-coordinated protection Works alongside downstream Type 2 and Type 3 telecom arresters.
BLITZDUCTOR XT – Protection Modules
- Protection for signal and data lines Designed specifically for measurement, control, and communication circuits.
- Low protection levels Safeguards sensitive electronics while maintaining signal quality. Modular, space-saving design
- Fast response times Effective against fast transient overvoltages.
- High system availability Reduces the risk of downtime and equipment failure.
DEHNpatch – Arrester for Data Networks and Ethernet Applications
- Protection for Ethernet and data networks Designed specifically for LAN and structured cabling systems.
- Supports high-speed data transmission Maintains signal integrity for modern Ethernet applications.
- Suitable for PoE systems Protects devices powered over Ethernet without affecting performance.
- Compact, inline design Easy installation within patch panels and network cabinets.
Welcome Jim Murray to OEM Demesne
A familiar face returns. Jim Murray joins OEM-Demesne as Chief Sales & Supplier Officer, bringing 26 years of industry leadership back to the business at a defining moment in the move to OEM Automatic.
Katko IsoSafe KSM Safety Switch
Katko has launched a significant upgrade to its IsoSafe KSM safety switch range (16–25A), built around the realities of modern installation work. The redesigned side-operated switch combines an
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Wohner 60 Classic and Crossboard
Modular busbar systems that streamline power distribution, improve safety, and speed up panel builds.
Tekox Terminal Strips Safety Blocks and Porcelain Blocks
Great electrical installations don't fail because of the major components. They fail because of the small ones that didn't get enough attention.
It's easy to focus on the big-ticket items during specification — and let the terminal blocks become an afterthought. But inferior connection components have a habit of making themselves known over time. Loose connections, degraded insulation, premature failure. The kind of faults that are frustrating to trace and expensive to fix.
Tekox engineer their terminal strips, safety blocks, insulated strips, and porcelain blocks to the standards your installations deserve. Available now from Demesne Electrical — get in touch and we'll show you the range.
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Conta-Clip PPVK push-in potential distribution terminals simplify control cabinet wiring with tool-free connections, compact DIN rail mounting, and reliable current distribution up to 41A.
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Electrical Protection in Energy Storage Systems (ESS): Keys to a Safe Installation
The PMX fuse holder range is compact, halogen-free, and manufactured in Europe for fast availability. Available in 10×38, 14×51, and 22×58 sizes with IEC, UL, and CSA approvals, they feature silver-plated contacts, IP20 touch-safe design, and optional blown fuse indicators — giving panel builders reliable, safe, and flexible protection.
