3 Phase Surge Protection Device Unit with 8 Way Metal IP40 enclosure 40A MCB
18th Ed. Compliant
2-Year Warranty
UK Stock
Free Delivery £80+
Secure Payments With
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping. The WMCUSP440C is a complete 3 phase SPD unit supplied in a durable 8-way IP40 steel enclosure with a pre-fitted 4-pole Type 2 surge protection device and 40A C Curve MCB. It provides...
Pre-wired in the UK and tested before dispatch – allow up to 3 working days for shipping.
The WMCUSP440C is a complete 3 phase SPD unit supplied in a durable 8-way IP40 steel enclosure with a pre-fitted 4-pole Type 2 surge protection device and 40A C Curve MCB. It provides a practical ready-to-install solution for installers needing surge protection within a compact three-phase enclosure.
This pre-wired 3 phase surge protection board is suited to commercial distribution systems, EV infrastructure, renewable installations, plant rooms and specialist three-phase applications where coordinated surge protection and upstream overcurrent protection are required in one assembly.
Installer Tip: This 40A MCB version is commonly used where upstream RCD or RCBO protection already exists and a standalone three-phase SPD enclosure is needed without duplicating leakage protection.
Why Choose a 3 Phase SPD Unit with MCB?
In many commercial and industrial installations, surge protection needs to be added without duplicating existing earth leakage protection already provided elsewhere in the system.
The WMCUSP440C combines a 3 phase surge protection device, upstream MCB protection and steel enclosure in one compact assembly, helping simplify installation and reduce the need to build a separate SPD arrangement manually.
- Complete 3 phase SPD and enclosure assembly
- Suitable for standalone surge protection installations
- Pre-wired to reduce installation time
- Designed for commercial distribution boards and EV infrastructure
- Helps protect sensitive three-phase equipment from transient overvoltages
Key Features
- 3 phase SPD unit – complete surge protection enclosure for three-phase systems
- 4-pole Type 2 SPD – protects against transient overvoltages and switching surges
- 40A C Curve MCB included – upstream overcurrent protection fitted
- 8-way IP40 steel enclosure – compact metal board format
- Pre-wired and tested in the UK – installer-ready assembly
- Neutral and earth bars included – suitable for distribution board integration
- Suitable for EV infrastructure, plant equipment and commercial three-phase systems
3 Phase Surge Protection for Distribution Boards
A dedicated 3 phase surge protection device enclosure helps protect commercial and industrial electrical systems against transient overvoltages caused by switching events or external surge activity.
The WMCUSP440C is commonly used alongside three-phase distribution boards, EV infrastructure, renewable systems and plant equipment where surge protection needs to be installed in a clean, accessible and pre-configured format.
Because the SPD, MCB and enclosure are supplied together, installers can reduce assembly time while maintaining a more organised surge protection arrangement.
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 version is best when the installation already has RCD or RCBO protection elsewhere and you need a 3 phase SPD unit with overcurrent protection only.
Is this a 3 phase board with SPD?
Yes. This is a pre-wired 3 phase board with surge protection, combining a 4-pole Type 2 SPD and 40A MCB inside an 8-way steel enclosure.
Can this be used as a 3 phase distribution board with surge protection?
Yes. It is commonly used as a 3 phase distribution board with surge protection where a compact pre-wired SPD enclosure is required.
What if I need leakage protection as well?
Use the 40A RCD version for added earth leakage protection, or the 40A RCBO version for combined overcurrent and leakage protection.
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.
What is a 3 phase SPD unit used for?
A 3 phase SPD unit is used to protect three-phase electrical systems and distribution boards against transient overvoltages caused by switching events or external surge activity.
Is this a standalone 3 phase surge protection enclosure?
Yes. The WMCUSP440C is supplied as a complete pre-wired enclosure containing a Type 2 SPD, 40A MCB and internal bars for straightforward integration into suitable three-phase systems.
Can this be used for EV infrastructure?
Yes. This unit is commonly used as part of three-phase EV infrastructure where surge protection is required upstream of EV distribution equipment.
- Model: WMCUSP440C
- Product Type: 3 Phase SPD Unit / 3 Phase Surge Protection Board
- Enclosure: 8-way steel, IP40 rated, surface mount
- SPD: 4-pole Type 2, 20kA nominal / 40kA maximum
- MCB: 40A, 10kA, C Curve
- Bars Included: Neutral and earth bars fitted inside enclosure
- Application: Three-phase distribution boards and surge-protected installations
- Compliance: BS EN 61439-3 · IEC 61643 · BS 7671:2018 Amendment 2
- Configuration: Pre-wired standalone 3 phase SPD enclosure
This unit is built to order and pre-wired in our UK facility. It should be installed by a qualified electrician as part of a compliant three-phase surge protection arrangement.
- Mount vertically on a dry indoor surface using suitable enclosure fixings
- Check compatibility with the installation earthing arrangement before energising
- Rear and side knockouts are provided for flexible cable entry
- Keep the SPD earth connection as short as possible to reduce let-through voltage
- Internal wiring schematic is supplied inside the enclosure lid
- Suitable for use alongside three-phase distribution boards and standalone SPD arrangements
