4 Way Metal EV Protection Unit – 40A B Curve A-Type RCBO + SPD (WMRC40BSP)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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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, regulation-compliant board. Installer Tip: The...
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, regulation-compliant board.
Installer Tip: The 40 A B-Curve RCBO is ideal for 9.6 kW EV chargers or circuits requiring greater load headroom. Its twin-handle design clearly separates overcurrent and earth-leakage trips, helping electricians diagnose faults faster and reduce callouts.
- 4-way steel enclosure with powder-coated white finish (WMRC series)
- 40 A B-Curve A-Type RCBO – bi-directional and high immunity for EV chargers
- Factory-fitted Type 2 SPD (20 kA / 40 kA) – protects against transient overvoltage
- Fully pre-wired and labelled for quick, compliant installation
- 25 mm & 32 mm knockouts – top and bottom for flexible cable routing
- Meets BS 7671 Amendment 2 and IEC surge protection standards
- Built to order – typically dispatched within 3 working days
| Model | RCBO Rating | Curve Type | SPD Type | Ingress Rating | Common Use |
|---|---|---|---|---|---|
| WMRC32BSP | 32 A | B Curve | Type 2 | IP40 (Metal) | Domestic EV charger ≤7.4 kW |
| WMRC40BSP | 40 A | B Curve | Type 2 | IP40 (Metal) | Higher-load EV charger ≤9.6 kW |
| WMRC32CSP | 32 A | C Curve | Type 2 | IP40 (Metal) | Commercial EV installations |
| WMRC40CSP | 40 A | C Curve | Type 2 | IP40 (Metal) | Heavier-duty or inverter loads |
This 40 A B-Curve version offers additional load capacity for high-demand EV chargers and larger single-phase circuits. Prewired, labelled, and built to 18th Edition standards for safe, reliable operation on site.
Is this unit 18th Edition compliant?
Yes — it meets the A-Type RCBO and SPD requirements under BS 7671 Amendment 2 for EV installations. For full PEN protection, see our PME Fault Detection Units.
Why choose a 40 A version?
The 40 A rating provides extra headroom for higher-output EV chargers or dual-outlet setups, ensuring consistent protection and avoiding nuisance tripping.
What’s the purpose of the dual RCBO handles?
The black handle controls the overcurrent protection (MCB) while the white handle operates the RCD (earth-leakage). This simplifies diagnostics and fault tracing on site.
Can this be used with any EV charger?
Yes — compatible with most single-phase EV chargers requiring 30 mA A-Type protection and surge suppression. Always check the charger manufacturer’s recommendations before installation.
What’s included in the unit?
A 4-way metal enclosure pre-fitted with a 40 A A-Type RCBO and Type 2 SPD, wired and labelled for immediate use.
- SKU: WMRC40BSP
- Product Type: EV Protection Unit with RCBO and Surge Protection
- Enclosure: 4-way metal, powder-coated white (IP40)
- Cable Entry: 25 mm & 32 mm knockouts (top and bottom)
- RCBO: 2-pole A-Type, bi-directional, high immunity
- Rating: 40 A B Curve | 30 mA RCD
- SPD: Type 2, 2-pole | 20 kA / 40 kA discharge capacity
- Mounting: DIN-rail pre-wired and labelled
- Standards: BS 7671 (18th Edition), IEC 61009-1, IEC 61643-11
This unit is supplied fully pre-wired and ready for installation by a qualified electrician. It provides overload, earth-leakage, and surge protection for single-phase EV charger supplies.
- Mount enclosure vertically on a solid indoor surface
- Use suitable fixings for metal enclosures
- Route incoming tails through 25 mm or 32 mm knockouts
- Ensure SPD earth and RCBO connections are direct and secure
- Do not alter internal wiring — this will void warranty and compliance
