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.
Meter Isolator with 100A Main Switch & Surge Protection WEC440SP
£34.60
The WEC440SP is a compact 4-module Meter Supply Isolator with a 100A Double Pole Main Switch and built-in 40kA Type 2 Surge Protection Device (SPD). Designed to be installed between the meter and consumer unit, it provides essential isolation while protecting circuits from voltage transients,...
3 Phase Surge protection in Metal Enclosure
£38.34
The WCED WME3P40SP is a pre-assembled 3-phase surge protection unit housed in a durable steel enclosure – built to safeguard commercial, industrial, and EV installations from transient overvoltages. Each unit includes a 4-pole Type 2 SPD, making it fully compliant with BS 7671 (18th Edition...
A-Type RCBO EV Kit with RCBO of your choice - 2 Way
£28.34
The A-Type RCBO EV Kit is a 2-way enclosure pre-fitted with your choice of Type A high immunity RCBO. Designed specifically for EV charger supplies, it provides overload, short-circuit, and earth leakage protection with 30mA AC + 6mA DC detection to meet 18th Edition Amendment...
Single Module Surge Protection Device WSPD140
£19.08
The WSPD140 is a compact single-module Type 2 Surge Protection Device designed to safeguard domestic and commercial circuits against transient overvoltages caused by lightning strikes or switching events. It delivers reliable protection for sensitive electronics and meets the latest 18th Edition Amendment 2 requirements for...
Metal Surge Arrestor Unit
£35.20
The Metal Surge Arrestor Unit (WME440SP) provides a simple and compliant way to add surge protection to an existing installation. Housed in a compact IP40-rated metal enclosure, it is supplied with a 100A main switch and a twin-pole 40kA Type 2 Surge Protection Device (SPD)....
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.