3 Way EV RCBO Enclosure – Type A High Immunity 40A Type B (WMEV340B)
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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The WMEV340B is a robust 3-way EV RCBO enclosure providing earth-leakage and overload protection for higher-rated single-phase EV chargers. Supplied with a 40A Type A High Immunity RCBO (Type B curve), it delivers 30 mA AC and 6 mA DC protection in line with BS 7671:2018 Amendment 2. This model...
The WMEV340B is a robust 3-way EV RCBO enclosure providing earth-leakage and overload protection for higher-rated single-phase EV chargers. Supplied with a 40A Type A High Immunity RCBO (Type B curve), it delivers 30 mA AC and 6 mA DC protection in line with BS 7671:2018 Amendment 2.
This model is ideal for 9.6 kW EV chargers or heavier single-phase loads where full 6 mA DC detection is required. Its compact, IP40-rated metal body keeps installs neat and compliant while supporting PME and surge-protected configurations.
Installer Tip: For 40 A EV circuits, verify cable sizing and voltage-drop calculations per BS 7671 Section 525 to maintain efficiency and safety.
- Supplied with 40 A Type A High Immunity RCBO (B curve)
- Detects AC, pulsating DC and 6 mA smooth DC leakage
- 3-module IP40 metal enclosure – compact and durable
- Provides overload and residual current protection in one device
- PME-ready and SPD-compatible for full EV compliance
- Built to order – typically dispatched within 3 working days
| Part Code | Description | RCBO Rating | Trip Curve |
|---|---|---|---|
| WMEV332B | 3 Way EV RCBO Enclosure – Type A High Immunity 32 A Type B | 32 A | B |
| WMEV332C | 3 Way EV RCBO Enclosure – Type A High Immunity 32 A Type C | 32 A | C |
| WMEV340B | 3 Way EV RCBO Enclosure – Type A High Immunity 40 A Type B | 40 A | B |
| WMEV340C | 3 Way EV RCBO Enclosure – Type A High Immunity 40 A Type C | 40 A | C |
The WMEV340B delivers dependable protection for high-demand single-phase EV circuits, combining Type A RCBO technology with a compact metal enclosure for fast, compliant installation under the 18th Edition requirements.
Is the 40 A Type B RCBO suitable for domestic EV chargers?
Yes. It’s ideal for 9 kW–9.6 kW single-phase chargers that require 6 mA DC detection and standard Type B trip characteristics.
What’s the benefit of a High Immunity Type A RCBO?
It avoids nuisance tripping caused by harmonics or charger inverter noise while still detecting both AC and DC faults.
Does this unit include surge protection?
No. It provides RCBO protection only; SPD can be added at the supply board if required.
Is it PME compliant?
Yes — when used with an appropriate PEN fault detection device.
Is it pre-wired?
No. It’s supplied un-wired for flexible termination on site.
- Model: WMEV340B
- Modules: 3
- Current Rating: 40 A
- Trip Curve: B
- Type: A High Immunity RCBO
- Earth Leakage: 30 mA AC / 6 mA DC
- Protection: Overload & Residual Current
- Enclosure: IP40 metal body
- Application: Single-phase EV charging supply
- Compliance: BS EN 61009, BS EN 61439, BS 7671 (18th Edition)
This unit must be installed by a qualified electrician. It is suited to single-phase EV chargers drawing up to 40 A and requiring 6 mA DC leakage protection. Confirm RCBO curve and rating with the charger manufacturer before energising.
- Securely mount on a flat surface using appropriate fixings
- Maintain correct polarity and earth continuity
- Torque terminals to manufacturer specification
- Install in dry, ventilated indoor locations (IP40)
- Label clearly as EV supply point
