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.

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