4 Way Metal EV Protection Unit – 32A B Curve A-Type RCBO + SPD (WMRC32BSP)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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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. Installer Tip: The dual-handle RCBO...
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.
Installer Tip: The dual-handle RCBO simplifies fault-finding on site — the black handle isolates overcurrent faults, while the white handle isolates earth-leakage trips. This speeds up diagnosis and reduces downtime during EV charger commissioning.
- 4-way steel enclosure with white powder-coated finish (WMRC series)
- 32 A B-Curve A-Type RCBO — bi-directional and high-immunity for EV loads
- Factory-fitted Type 2 SPD (20 kA/40 kA) — protects against transient overvoltage
- Pre-wired and labelled for quick, regulation-compliant installation
- 25 mm & 32 mm knockouts top & bottom for flexible cable routing
- Fully compliant with BS 7671 Amendment 2 and relevant IEC 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) | High-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 32 A B-Curve variant offers the optimal balance of protection and sensitivity for standard single-phase EV chargers. Fully wired, labelled, and compliant with BS 7671 Amendment 2 for quick approval during inspection.
Is this unit 18th Edition compliant?
Yes — it meets the surge-protection and A-Type RCD requirements under BS 7671 Amendment 2 for EV installations. For PEN fault protection, see our PME Fault Detection Units.
What’s the benefit of a bi-directional RCBO?
It detects faults regardless of current flow direction, ideal for EV chargers or inverter-driven systems where reverse currents can occur.
What do the dual handles do?
The black handle controls overcurrent protection (MCB); the white handle controls earth-leakage protection (RCD). If only the black trips, it’s an overload; if both trip, it’s a leakage fault.
Can this be used with any EV charger?
Yes — suitable for most single-phase EV chargers where 30 mA A-Type and Type 2 SPD protection are required. Check charger manufacturer specifications before installation.
What’s included in the unit?
A 4-way metal enclosure with pre-fitted A-Type RCBO and Type 2 SPD — fully wired and ready to install.
- SKU: WMRC32BSP
- 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: 32 A B Curve | 30 mA RCD
- SPD: Type 2 2-pole | 20 kA / 40 kA discharge capacity
- Mounting: DIN-rail pre-wired & labelled
- Standards: BS 7671 (18th Edition), IEC 61009-1, IEC 61643-11
This unit is supplied fully pre-wired and ready for install by a qualified electrician. It provides overload, earth-leakage, and surge protection within one compact metal enclosure.
- 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 RCBO and SPD earth connections are direct and secure
- Do not modify internal wiring — doing so voids warranty
