3 Phase Surge Protection Devices for Boards, Panels & Industrial Loads
3 phase surge protection devices are designed to protect three-phase distribution boards, control panels and equipment from transient overvoltages. They guard against surges caused by lightning, switching events and network disturbances, helping prevent damage to sensitive electronics, control gear and plant.
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These SPDs are built for three-phase supplies and are available in Type 1, Type 2 or combined Type 1+2 variants. They are fitted at the origin or key distribution points of an installation and are sized to handle the prospective surge currents expected on that system.
- Three-phase protection for boards, panels and industrial circuits
- Type 1, Type 2 and Type 1+2 options to match installation requirements
- Suitable for TN-S, TN-C-S and TT systems where correctly selected
- High kA ratings to handle lightning and switching surges
- Pluggable cartridges on many models for easy replacement
Correctly specified three-phase SPDs are now an expectation on many new commercial, industrial and high-value domestic installations, reducing downtime and protecting both equipment and control systems over the long term.
3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A RCD
£70.45
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...
3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A RCBO
£89.20
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WRCUSP440C 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...
What Is a 3 Phase Surge Protection Device?
A 3 phase surge protection device is installed on three-phase supplies to limit transient overvoltages to safe levels. During a surge, it diverts excess energy away from connected equipment, helping to protect boards, control panels and downstream loads from insulation breakdown or failure.
Where 3 Phase SPDs Are Used
- Main three-phase distribution boards in commercial or industrial buildings
- Sub-distribution boards feeding plant, machinery or critical equipment
- Control panels for motors, pumps and production lines
- Sites with external runs such as outbuildings, workshops or remote plant rooms
- Installations with sensitive electronics such as drives, PLCs and monitoring systems
Type 1, Type 2 and Type 1+2 Devices
Type 1 SPDs are used where there is a risk of direct lightning currents entering the installation, typically at the origin in buildings with external lightning protection systems.
Type 2 SPDs are installed in most standard distribution boards to deal with switching surges and indirect lightning effects.
Type 1+2 units combine both functions and are often chosen at the main incomer for simplicity and broad protection.
Key Specifications to Consider
- System voltage and earthing type – ensure the SPD matches the supply and earthing arrangement
- Nominal discharge current (In) and maximum discharge current (Imax) – sized to expected surge levels
- Voltage protection level (Up) – must be low enough to protect connected equipment
- Module format – three-phase plus neutral arrangements with clear labelling
- Visual indicators – end-of-life windows or flags to show when replacement is required
Compliance & Standards
All three-phase SPDs in this category are designed to meet the surge protection requirements of BS 7671 (18th Edition), including the assessment of overvoltage risk and protection for sensitive installations. Devices follow the performance standards of EN 61643-11 or equivalent, covering test methods and classification.
Installer Benefits
Well-specified three-phase surge protection reduces call-outs, protects expensive equipment and helps keep production or building services running. Clear terminals, compact footprints and replaceable cartridges make installation and maintenance straightforward for contractors working on new builds, upgrades and refurbishments.