3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A MCB
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £30+
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Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WMCUSP440C is a ready-to-fit 3-Phase Surge Protection Device (SPD) Unit supplied in an 8-way IP40 steel enclosure. It includes a 4-pole Type 2 SPD (20kA/40kA) paired with a 40A MCB, giving you...
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping.
The WMCUSP440C is a ready-to-fit 3-Phase Surge Protection Device (SPD) Unit supplied in an 8-way IP40 steel enclosure. It includes a 4-pole Type 2 SPD (20kA/40kA) paired with a 40A MCB, giving you transient overvoltage suppression and overcurrent protection in one compliant board. Suitable for EV charging hubs, renewable installs, plant rooms, and commercial/industrial sites.
Installer Tip: The 40A MCB version is the right choice when upstream protection is already provided by RCDs or RCBOs. It gives you robust surge suppression + overcurrent protection without duplicating earth leakage devices.
Why Choose the 40A MCB Variant?
In many commercial and renewable installs, upstream RCD or RCBO protection is already in place. The WMCUSP440C keeps things simple: it adds overcurrent security and surge suppression at the origin, without unnecessary duplication. This makes it:
- Cost-efficient - you’re not paying for redundant leakage protection
- Compact - supplied in an 8-way steel enclosure ready to mount
- Compliant - tested to BS 7671:2018 Amendment 2
- Fast-fit - pre-wired and labelled, saves time on site
Key Features
- 40A MCB: Overcurrent protection for three-phase circuits
- Type 2 SPD: 4-pole, rated 20kA/40kA
- 8-way IP40 Enclosure: Steel, surface mount with neutral/earth bars
- Pre-wired in the UK: Built to order and tested before dispatch
- Compliance: BS EN 61439-3 · IEC 61643 · BS 7671 Amd 2
Variant Comparison
| Variant | Protection Provided | Best For |
|---|---|---|
| 40A MCB (This Product) | Overcurrent only | Circuits already RCD/RCBO protected |
| 63A MCB | Overcurrent only, higher load | Larger commercial/industrial installs |
| 40A RCD | 30mA High Immunity earth leakage | When additional RCD protection is required |
| 40A RCBO | Overcurrent + 30mA High Immunity leakage | Best for EV, solar, sensitive industrial loads |
When should I use the 40A MCB version?
This is best when your installation already has RCD or RCBO protection elsewhere, and you need surge suppression with basic overcurrent protection at the origin.
What if I need leakage protection too?
Use the 40A RCD version for high immunity earth leakage, or the 40A RCBO version for combined overcurrent + earth leakage protection.
Is this compliant with the 18th Edition regs?
Yes – it’s designed and tested to BS 7671 Amendment 2 and includes a 4-pole Type 2 SPD with modular overcurrent protection.
Can this be used as a 3-phase distribution board?
Yes – it’s commonly fitted as a surge-protected TPN distribution board, replacing or upgrading a standard board with integrated SPD + MCB modules.
Does this include neutral and earth bars?
Yes – full DIN rail, neutral bar, and earth bar are included inside the enclosure.
How fast is delivery?
Each unit is pre-wired to order in the UK and dispatched within 3 working days. All boards are supplied with a 2-year manufacturer warranty.
- Enclosure: 8-way steel, IP40 rated, surface mount
- SPD: 4-pole Type 2, 20kA/40kA
- MCB: 40A, 10kA, C Curve
- Neutral/Earth: Full bars included inside enclosure
- Compliance: BS EN 61439-3 · IEC 61643 · BS 7671:2018 Amd 2
This unit is built to order and pre-wired in our UK facility. Installation must be carried out by a qualified electrician.
- Mount vertically on a dry indoor surface using metal enclosure fixings
- Check compatibility with TN-C-S (PME) or TT earthing before energising
- Rear and side knockouts provided for flexible cable entry
- SPD earth connection should be as short as possible to minimise let-through voltage
- Wiring schematic supplied inside the enclosure lid for reference
