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
4 Way Metal Enclosure with 100A Main Switch & 40kA Type 2 Surge Protection
£42.50
The WMCU440SP is a compact metal surge protection unit combining a 100A main switch with a 2-pole Type 2 SPD rated at 40kA. Designed for installation between the meter and the consumer unit, it provides both safe isolation and surge protection in a single enclosure....
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.