3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A RCD
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 WRDUSP440C 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 High Immunity RCD,...
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping.
The WRDUSP440C 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 High Immunity RCD, delivering both surge suppression and earth leakage protection in one pre-wired board. Built to BS 7671:2018 Amendment 2, it’s ideal where both transient voltage protection and 30mA earth fault detection are required.
Installer Tip: The 40A RCD variant is the right choice when you need to add earth leakage protection alongside surge suppression, but don’t require combined overcurrent + RCD in a single device (for that, see the RCBO version).
Why Choose the 40A RCD Variant?
Some installs already have dedicated MCBs in place but lack earth leakage protection. The WRDUSP440C fills that gap by adding a 30mA High Immunity RCD, reducing nuisance tripping while still providing reliable disconnection on fault. This makes it:
- Leakage-ready — adds RCD protection to three-phase boards
- High Immunity — resistant to unwanted trips in noisy circuits
- Compliant — built to BS EN 61008-1 and BS 7671 Amd 2
- Installer-friendly — pre-wired, labelled, and built to order in the UK
Key Features
- 40A RCD: 30mA High Immunity residual current protection
- Type 2 SPD: 4-pole, rated 20kA/40kA
- Enclosure: 8-way steel, IP40 surface mount
- Pre-wired in the UK: Built and tested before dispatch
- Compliance: BS EN 61439-3 · IEC 61643 · BS EN 61008-1 · BS 7671 Amd 2
Variant Comparison
| Variant | Protection Provided | Best For |
|---|---|---|
| 40A MCB | Overcurrent only | Circuits already RCD/RCBO protected |
| 63A MCB | Overcurrent only, higher load | Larger commercial/industrial installs |
| 40A RCD (This Product) | 30mA High Immunity earth leakage | Adds RCD protection where only MCBs exist |
| 40A RCBO | Overcurrent + 30mA High Immunity leakage | Best for EV, solar & sensitive industrial loads |
When should I choose the RCD variant?
When your installation already has MCBs but needs additional earth leakage protection. The High Immunity RCD reduces nuisance tripping on circuits with background noise.
What’s the difference between RCD and RCBO variants?
The RCD provides earth leakage protection only. The RCBO version combines overcurrent and leakage protection in one device.
Does this unit include overcurrent protection?
No – this variant provides surge suppression and RCD protection. For overcurrent coverage, pair with upstream MCBs or choose the MCB version.
Is it compliant with the 18th Edition regs?
Yes – the WRDUSP440C meets BS 7671 Amendment 2 and includes a 4-pole Type 2 SPD.
Does it come with neutral and earth bars?
Yes – the enclosure includes full neutral and earth bars inside.
How quickly will it ship?
Units are built to order in the UK and normally dispatched within 3 working days. Each board comes with a 2-year manufacturer warranty.
- Enclosure: 8-way steel, IP40 rated, surface mount
- SPD: 4-pole Type 2, 20kA/40kA
- RCD: 40A, 30mA High Immunity
- Neutral/Earth: Full bars included inside enclosure
- Pre-Wiring: Built and tested in the UK
- Compliance: BS EN 61439-3 · IEC 61643 · BS EN 61008-1 · BS 7671 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
- Confirm earthing arrangement (TN-C-S or TT) before energising
- Rear and side knockouts provided for flexible cable entry
- SPD earth connection must be kept as short as possible
- Wiring schematic supplied inside the enclosure lid for reference
