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.

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

✓ In stock SKU: WME2280TR/SP

Twin RCD Metal Consumer Unit – WME2280TR/SP (22 Module, 80A, with Surge Protection)

£106.45 ex VAT £127.74 inc VAT

The WME2280TR/SP is a 22-module metal twin RCD consumer unit with a 100A main switch, two 80A, 30mA Type AC RCDs and a Type...

View product

✓ In stock SKU: WME1880TR/SP

Twin RCD Metal Consumer Unit – WME1880TR/SP (18 Module, 80A, with Surge Protection)

£97.85 ex VAT £117.42 inc VAT

The WME1880TR/SP Twin RCD Metal Consumer Unit is an 18-module split-load board supplied with a 100A main switch, two 80A RCDs, and a factory-fitted...

View product

Out of stock SKU: WMCU440SP

4 Way Metal Enclosure with 100A Main Switch & 40kA Type 2 Surge Protection

£42.50 ex VAT £51.00 inc VAT

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...

View product Unavailable

Selecting Surge Protection for the Installation

An SPD must be selected for the supply arrangement, installation location and applicable risk assessment. Confirm whether Type 1, Type 2 or combined protection is required, then match the device configuration and ratings to the manufacturer’s design information.

Type 2 SPD Modules

Commonly installed at consumer units and distribution boards to limit transient overvoltage from switching events and indirect lightning effects.

View Type 2 SPDs →

Enclosed SPD Units

Pre-wired or external enclosures can provide a practical retrofit route where board space is limited or a separate protective assembly is preferred.

View Enclosed SPD Units →

Three-Phase Protection

Three-phase systems require a suitable multi-pole SPD arrangement coordinated with the supply, earthing system and upstream protection.

Shop Three-Phase SPDs →

Specification Checklist

SPD type: establish whether Type 1, Type 2 or combined protection is required
Supply arrangement: match the device to single-phase or three-phase supply and earthing system
Protective coordination: follow manufacturer requirements for backup protection and conductor sizing
Installation position: keep connections appropriately short and route conductors as specified
Status indication: confirm how the device shows end-of-life or replacement status

Selection Guides

Related Categories

Three-Phase SPDs EV Surge Protection Boards Consumer Units Heat Pump Boards Circuit Protection

Trade support: UK-stocked products, manufacturer-backed specifications and fast dispatch. Check each product page for ratings, standards, stock status and delivery details before ordering.