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.
A-Type RCBO EV Kit – 2 Way 16 A B Curve (WMEV216B)
£28.34
The WMEV216B is a 2-way A-Type RCBO EV Kit fitted with a 16 A B-curve high-immunity Type A RCBO. It provides overload, short-circuit and earth-leakage protection for EV charger circuits, detecting 30 mA AC + 6 mA DC fault currents to meet 18th Edition Amendment...
A-Type RCBO EV Kit – 2 Way 10 A B Curve (WMEV210B)
£28.34
The WMEV210B is a 2-way A-Type RCBO EV Kit fitted with a 10 A B-curve Type A RCBO, providing overload, short-circuit and earth-leakage protection for small single-phase EV circuits. With 30 mA AC + 6 mA DC detection, it meets 18th Edition Amendment 2 requirements...
3 Way EV RCBO Enclosure – Type A High Immunity 40A Type C (WMEV340C)
£27.50
The WMEV340C is a high-capacity 3-way EV RCBO enclosure designed to protect single-phase EV charger circuits that demand both earth leakage and overload protection. Supplied with a 40A Type A High Immunity RCBO (Type C curve), it offers 30mA AC and 6mA DC fault detection...
3 Way EV RCBO Enclosure – Type A High Immunity 40A Type B (WMEV340B)
£27.50
The WMEV340B is a robust 3-way EV RCBO enclosure providing earth-leakage and overload protection for higher-rated single-phase EV chargers. Supplied with a 40A Type A High Immunity RCBO (Type B curve), it delivers 30 mA AC and 6 mA DC protection in line with BS...
3 Way EV RCBO Enclosure – Type A High Immunity 32A Type C (WMEV332C)
£27.50
The WMEV332C is a compact 3-way EV RCBO enclosure engineered for earth leakage and overload protection on single-phase EV charging circuits. Supplied with a 32A Type A High Immunity RCBO (Type C curve), it provides dependable 30mA AC and 6mA DC leakage protection, ensuring compliance...
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.