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.
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...
Metal Surge Arrestor Unit
£35.20
The WME440SP Metal Surge Arrestor Unit 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)....
Heat Pump Consumer Unit 8 Way (WME08/HP40C)
£174.50
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WME08/HP40C Heat Pump Consumer Unit is a dedicated protection board for inverter-driven heat pump systems. It comes pre-fitted with a 40A Type B RCD, a 40A Type...
3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A RCBO
£89.20
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WRCUSP440C 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...
4 Way Mini Plastic Enclosure with 100A Main Switch & Type 1/2 Surge Protection (WEC440SPT12)
£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...
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.