Surge Protection Devices – Type 2 SPD
Surge protection devices (SPDs) are essential for preventing transient overvoltage from damaging circuits and equipment. Our range includes Type 2 SPDs, retrofit surge arrestors, and pre-wired metal kits – all tested to BS EN 61643 and compliant with the 18th Edition circuit protection rules.
Installers rely on SPDs to safeguard EV chargers, three-phase systems, PME boards, and heat pump consumer units. Every unit is UK-stocked for next-day delivery, with easy returns support if required.
Read more about surge protection devices
A whole house surge protector (or domestic SPD) prevents voltage spikes from damaging appliances and sensitive electronics. Surge protection is now a requirement in most new builds and consumer unit upgrades, making it a standard part of safe electrical design.
Options include:
- Type 2 SPDs – for protection at the distribution board against common transient overvoltages.
- SPD kits with enclosures – pre-wired for quick fit alongside existing consumer units.
- Standalone surge arrestors – compact solutions for retrofit installs.
All devices are backed by manufacturer warranties and dispatched directly from our UK warehouse.
Surge Protection Device Kit WSPDT2-CB
£19.06
The WSPDT2-CB SPD Kit is a compact Type 2, 40kA surge protection device designed to guard electrical systems and sensitive equipment against voltage spikes caused by lightning strikes or switching surges. Its slim 1-module, 2-pole design makes it ideal for consumer units where space is...
4 Way Mini Plastic Enclosure with 100A Main Switch & Type 1/2 Surge Protection
£82.55
£165.00
This compact surge protection unit combines a 2-pole 100A main switch with a pre-wired Type 1+2 SPD, all enclosed in a 4-module plastic IP-rated enclosure. Ideal for domestic and light commercial installs where space is tight but full lightning and surge compliance is required. Designed...
A Type RCBO EV Kit with RCBO Of Your Choice - 3 Way
£27.50
The 3 Way EV RCBO Enclosure is a compact, built-to-order unit that provides both earth leakage and overload protection for single-phase EV charger installs. Supplied with your choice of Type A High Immunity RCBO (B or C curve, 32A or 40A), it’s only 34mm wider...
Heat Pump Consumer Unit - WME**/HP40C
£147.80
This Heat Pump Consumer Unit is a dedicated protection board designed specifically for inverter-driven heat pump circuits. Supplied pre-configured with a 40A Type B RCD, a 40A Type C MCB, and a 2-pole Type 2 SPD, it offers full compliance with BS7671 18th Edition Amendment...
3 Pole Surge Protection Device WSPD340
£21.35
The WSPD340 is a 3-pole Type 2 Surge Protection Device designed for three-phase boards. Rated at 20kA nominal discharge and 40kA max discharge, it provides reliable protection against transient overvoltages caused by indirect lightning strikes and switching surges. Built to comply with BS 7671 and...
Whole House & Domestic Surge Protection
Adding surge protection to your property protects more than just appliances – it safeguards your entire electrical system. A single voltage spike can damage computers, smart home devices, boilers, and EV chargers. Installing an SPD (Surge Protection Device) at the consumer unit prevents these costly failures and ensures long-term compliance with UK wiring standards.
When Do You Need Surge Protection?
Under the 18th Edition of BS 7671, surge protection must be considered on all new consumer unit installs. In most homes, a Type 2 SPD is recommended as the baseline level of defence against transient overvoltage.
- Domestic properties – SPDs are now common in new builds and consumer unit upgrades. A popular choice is the Single Module Surge Protection Device, which slots neatly into existing boards.
- EV charging – required for safe and compliant installation of chargers. Many installers opt for the 4-Way EV Protection Unit, combining RCBO and SPD in one enclosure.
- Solar PV systems – protect inverters and renewable kit with units like the 3-Phase Surge Protection in Metal Enclosure, built for higher loads.
- Commercial sites – minimise downtime with 3-Phase SPD Complete with MCB, designed for distribution boards in larger installs.
Choosing the Right SPD
Surge protection comes in different formats depending on your installation:
- Type 1 SPDs – usually for sites with lightning protection or higher risk of direct strikes.
- Type 2 SPDs – standard choice for most UK domestic and commercial installs. Explore all Type 2 SPDs.
- Standalone SPD modules – compact devices for retrofitting into existing boards.
- Pre-wired SPD enclosures – ideal when adding surge protection alongside a consumer unit.
Trusted Surge Protection Devices
All our surge protection kits and devices are:
- BS EN 61643 certified for proven reliability
- UK-stocked for fast delivery
- Available with manufacturer warranties
- Shipped with next-day delivery on qualifying orders
FAQs on Surge Protection
What is whole house surge protection?
Whole house surge protection refers to fitting an SPD at your main consumer unit, preventing transient overvoltage from damaging all circuits and appliances in your property.
Do I need surge protection in the UK?
Yes – BS 7671 requires that surge protection be considered on all installs. In most homes, it’s now best practice (and often mandatory) to fit at least a Type 2 SPD.
Can I retrofit a surge protector to my existing consumer unit?
Absolutely – retrofit SPD kits and standalone enclosures are available to add protection without replacing your entire board.
Not sure which SPD you need? Speak to our technical team for guidance, or review our returns policy for hassle-free support.