Surge Protection Devices & Type 2 SPDs
Surge protection devices, also known as SPDs, help protect electrical installations from transient overvoltage caused by switching events, supply disturbances and lightning-related surges. Browse Type 2 SPDs, whole house surge protection units, external SPD enclosures and three-phase surge protection devices for domestic, commercial and renewable installations.
Our range includes standalone SPD modules, retrofit surge protection kits and pre-wired enclosure units for consumer units, EV chargers, heat pumps, solar PV systems and distribution boards.
Quick answer: For most UK homes and small commercial installations, a Type 2 surge protection device fitted at the consumer unit is the standard choice for whole house surge protection.
Read more about choosing surge protection
Choose your SPD based on the installation type, supply arrangement and whether you need a module-only device or a complete enclosure kit.
- Type 2 SPDs: common choice for consumer units and domestic installations
- Whole house surge protectors: fitted at the board to protect multiple final circuits
- External SPD units: useful where board space is limited or a separate enclosure is preferred
- Three-phase SPDs: used on commercial, industrial and larger distribution systems
- Renewable installs: suitable for EV, heat pump and solar PV protection where specified
Meter Isolator with 100A Main Switch & Surge Protection (WEC440SP)
£38.10
The WEC440SP is a compact 4 module meter isolator enclosure combining a 100A double pole main switch with an integral Type 2 surge protection device. Built around a 3 part seal and secure enclosure, this unit provides manual control of electrical devices while also adding...
3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A MCB
£73.80
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WMCUSP440C is a complete 3 phase SPD unit supplied in a durable 8-way IP40 steel enclosure with a pre-fitted 4-pole Type 2 surge protection device and 40A...
3 Phase Surge Protection in Metal Enclosure
£39.65
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 Type 2 Surge Protection Device (WSPD140)
£15.85
The WSPD140 is a compact single module Type 2 Surge Protection Device designed to help protect electrical installations against transient overvoltages caused by switching events and lightning-related surge activity. With a 20kA nominal discharge current and 40kA maximum discharge rating, it provides practical board-level surge...
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 Surge Protection Requirements
Under BS 7671, surge protection must be considered as part of the installation design. In many domestic and light commercial installations, a Type 2 SPD is now commonly fitted at the consumer unit to provide whole installation surge protection.
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 many modern domestic installations, a Type 2 SPD is fitted at the consumer unit as 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.