EV Surge Protection Devices for Domestic & Commercial Charger Circuits
EV Surge Protection Devices are designed to protect electric vehicle charge points and their supply circuits from transient overvoltages. These Type 2 SPDs limit spikes caused by lightning, grid disturbances and switching events, helping prevent costly damage to chargers, control modules and onboard electronics.
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Modern EV chargers include sensitive electronics and inverter-based components that are vulnerable to rapid voltage rises. Installing an SPD on the EV supply circuit is now a recognised requirement under 18th Edition guidelines for most installations, preventing surge energy from reaching the charger and the vehicle.
- Type 2 surge protection suitable for single-phase EV circuits
- Compact DIN-rail designs for indoor or IP-rated enclosures
- Fast clamping to protect charger electronics and vehicle systems
- Designed for stable EV operation on domestic and commercial sites
- Replaceable cartridges on many models for simplified maintenance
EV Surge Protection Devices are used in both new installs and upgrades, providing long-term resilience and minimising the risk of charger failure or warranty issues caused by untreated transient voltages.
4 Way Metal EV Protection Unit – 32A B Curve A-Type RCBO + SPD (WMRC32BSP)
£31.90
The WMRC32BSP is a 4 Way Metal EV Protection Unit combining an A-Type bi-directional RCBO with a Type 2 Surge Protection Device inside a durable steel enclosure. Designed for single-phase EV charger circuits, it delivers overload, earth-leakage, and transient-voltage protection in one pre-wired, regulation-ready board....
EV Connection Unit – 100A Main Switch + Surge Protection + 20A MCB (WEVCU20BSP)
£34.19
The WEVCU20BSP is a compact 5-module EV connection unit that combines surge protection, overload protection, and isolation in one enclosure. Housed in a 5-way IP40 metal consumer unit, it’s pre-wired and fitted with a 100A double-pole main switch, Type 2 SPD, and a 20A MCB...
8 Way IP65 EV Connection Unit with Surge Protection – 32A MCB (WPEVCU32BSP/8)
£43.55
The WPEVCU32BSP/8 is an 8 Way IP65 EV Connection Unit with Surge Protection designed for EV charger supplies that require a weatherproof, regulation-compliant solution. It combines isolation, overload protection, and surge defence in a compact, preassembled board — ready to install straight out of the...
4 Way Metal EV Protection Unit – 40A B Curve A-Type RCBO + SPD (WMRC40BSP)
£31.90
The WMRC40BSP is a 4 Way Metal EV Protection Unit combining a 40 A B-Curve A-Type RCBO and Type 2 Surge Protection Device inside a compact steel enclosure. Designed for higher-load EV charger circuits, it delivers overload, earth-leakage, and transient surge protection in one pre-wired,...
IP65 EV Connection Unit with SPD – 32A B Curve
£42.20
The WPEVCU32BSP is a compact IP65 EV connection unit pre-fitted with a 32A B Curve MCB, 100A isolator, and Type 2 Surge Protection Device (SPD). Designed for domestic EV charger installations, it provides weatherproof circuit protection that complies fully with BS 7671:2018 (Amendment 2). This...
Why EV Circuits Need Surge Protection
EV chargers contain onboard power supplies, communication modules and semiconductor components that can be damaged by short-duration voltage spikes. A Type 2 SPD fitted at the EV circuit helps prevent failures, downtime and costly callouts.
Common Applications
- Domestic EV charge points connected to a single-phase supply
- Commercial EV bays using multiple chargers on shared distribution
- Wallboxes and smart chargers with sensitive electronics
- Outdoor installations exposed to potential lightning-induced surges
- Retrofit EV circuits needing a simple surge-protection upgrade
How Type 2 SPDs Protect EV Chargers
EV SPDs operate by diverting transient surge energy to earth, preventing the overvoltage from reaching the charger or the vehicle. They clamp the surge to a safe level within microseconds, ensuring the connected equipment remains protected.
- Suppresses grid switching surges from DNO or internal events
- Protects charger electronics from sudden overvoltage
- Reduces risk of module failure and warranty loss
- Improves long-term reliability of EV charging equipment
Compliance & Standards
All EV Surge Protection Devices in this category comply with BS 7671 (18th Edition) surge protection requirements and follow the performance standards of EN 61643-11. They are suitable for use on TN-S, TN-C-S and TT systems when correctly selected.
Choosing the Right SPD for an EV Charger
The correct device depends on the charger rating, expected surge environment and enclosure size. Most domestic installations use a compact Type 2 SPD, while commercial sites may require higher discharge ratings to handle increased risk profiles.
Installer Benefits
EV SPDs provide a simple, high-value protection upgrade for new and existing EV circuits. They reduce callouts, prevent equipment damage and ensure installations meet modern electrical standards. Clear indicators and replaceable cartridges make ongoing maintenance straightforward.