Surge Protection Devices (SPD) – Domestic & Commercial
Surge Protection Devices (SPDs) protect electrical installations from transient overvoltage caused by switching events and lightning-related surges. Under the 18th Edition of BS 7671, surge protection must now be considered on all new consumer unit installs and upgrades.
Our range includes Type 2 SPDs, retrofit surge modules, and pre-wired metal enclosure kits – suitable for domestic properties, EV charger installs, heat pumps, solar inverters and three-phase systems.
Quick answer: Most UK homes and small commercial sites require a Type 2 SPD installed at the consumer unit to comply with modern wiring regulations and protect appliances from voltage spikes.
Read more about surge protection
We stock:
- Type 2 SPDs – the standard choice for domestic and light commercial installs
- Single and three-phase options – including 4-pole units
- Standalone SPD modules – compact retrofit solutions
- Pre-wired SPD enclosure kits – quick-fit protection alongside consumer units
All units are tested to BS EN 61643, UK stocked and backed by manufacturer warranties.
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 Device Unit with 8 Way Metal IP40 enclosure 40A MCB
£65.38
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WMCUSP440C is a ready-to-fit 3-Phase Surge Protection Device (SPD) Unit supplied in an 8-way IP40 steel enclosure. It includes a 4-pole Type 2 SPD (20kA/40kA) paired with...
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 – 2 Way 6 A B Curve (WMEV206B)
£28.34
The WMEV206B is a 2-way A-Type RCBO EV Kit fitted with a 6 A B-curve high-immunity Type A RCBO. Designed specifically for EV charger supplies, it delivers overload, short-circuit and earth-leakage protection in line with 18th Edition Amendment 2 requirements (30 mA AC + 6...
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...
Why Surge Protection Is Now Standard
Modern properties contain sensitive electronics – boilers, smart controls, EV chargers, heat pumps and consumer electronics. A single voltage spike can cause irreversible damage. Installing an SPD at the distribution board protects the entire installation and reduces the risk of costly equipment failure.
Domestic & Whole House Surge Protection
A whole house surge protector is typically a Type 2 SPD fitted within the consumer unit. It protects all final circuits from transient overvoltage events.
Popular choice: Single Module Surge Protection Device for straightforward retrofits.
EV Chargers, Heat Pumps & Renewables
Surge protection is especially important on inverter-driven systems. For compliant EV installs, many electricians choose integrated protection such as the 4-Way EV Protection Unit with SPD.
For higher-load or renewable systems, explore our three-phase protection options.
Choosing the Right SPD Type
- Type 1 SPD – typically required where lightning protection systems are installed.
- Type 2 SPD – standard for most UK domestic and commercial consumer units.
- Single-phase vs three-phase – match pole configuration to supply type.
- Integrated kits vs modules – choose based on board space and retrofit requirements.
18th Edition Compliance
BS 7671 requires surge protection to be assessed on every installation. In most residential and light commercial environments, a Type 2 SPD is required unless a formal risk assessment determines otherwise.
Why Buy From Power & Data UK?
All surge protection devices are BS EN 61643 certified, UK stocked and available with next-day delivery on qualifying orders. We provide clear technical specs and straightforward returns support for trade buyers.
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FAQs on Surge Protection
Is surge protection mandatory in the UK?
Surge protection must be considered under BS 7671. In most modern domestic installs, fitting a Type 2 SPD is standard practice.
Can I retrofit an SPD to an existing consumer unit?
Yes. Standalone modules and external enclosure kits allow surge protection to be added without replacing the full board.
Do EV chargers require surge protection?
Yes – most EV charger manufacturers and current wiring regulations require surge protection to be included as part of a compliant installation.