125A TPN Distribution Boards with SPD
Our 125A TPN distribution boards come pre-fitted with a 4-pole main switch and integrated Type 2 Surge Protection Device (SPD), giving full compliance with 18th Edition Amendment 2 for three-phase installs. Available from 4 to 24 ways, these boards are ready for commercial and industrial applications where reliable load handling and surge protection are critical.
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Each unit is supplied with a 125 A 4P incomer, a 4P SPD, and a factory-fitted 3P / 32 A MCB for SPD protection. Boards are designed for ease of installation, with removable gland plates, lift-off doors, and numbered terminals for quick identification.
- 125 A 4P main switch – suitable for demanding three-phase applications
- Integrated SPD – protects against transients and over-voltage surges
- Sizes 4–24 ways – scalable for small to large distribution requirements
- Extension and spreader boxes – expand capacity as needed
- BS EN 61439 compliant – meets all UK wiring regulations
We also stock compatible TPN extension boxes, spreader boxes, and conversion kits to adapt boards for single-phase use.
WTPNSPKIT - TPN Single Phase Conversion Kit **NEW**
£4.98
The WTPNSPKIT Single Phase Conversion Kit allows you to adapt 125A TPN (Three-Phase Neutral) distribution boards for single-phase use quickly, safely, and cost-effectively. Instead of replacing a full 3-phase board, this kit provides the components required to repurpose it for single-phase loads while maintaining compliance...
3 Phase Distribution Board Spreader Box
£50.80
£55.00
The WTPNSB 3 Phase Spreader Box is designed to support safe cable management and heat dissipation in three-phase distribution board installs. Used to separate conductors and maintain airflow, this add-on accessory reduces thermal build-up on high-current terminations and makes wiring tidier and safer for future...
3 Phase Extension Board 14 Module
£70.00
The WTPNEB14 14-Module 3 Phase Extension Board is part of the Whitecliffe WTPN range, designed to expand existing 125A three-phase distribution systems. Built in a robust 1.2mm steel enclosure, it’s ideal for commercial, industrial, and larger domestic installs where additional outgoing ways are needed without...
125A 3 Phase Distribution Board – 4 Way
£171.75
The WTPN04-125 is the most compact model in our 125A Three Phase Distribution Board range. Supplied with a 125A 4-pole main switch and integrated Type 2 Surge Protection Device (SPD), it’s designed for reliable distribution across smaller commercial, light industrial, or large domestic three-phase installs...
Choosing the Right 125A TPN Board
When specifying a 125 A TPN distribution board with SPD, consider the total load, number of outgoing ways, and whether future expansion will be required. Our range covers 4, 6, 8, 12, 16 and 24 way boards, with extension and spreader options available for larger systems.
Key Considerations
- Main switch rating – 125 A incomer suitable for most commercial installs
- SPD protection – supplied as standard for Amendment 2 compliance
- Outgoing ways – from 4 to 24, depending on circuit requirements
- Expansion – extension boxes and spreader kits allow easy upgrades
- Compliance – all units manufactured to BS EN 61439
Featured Boards & Accessories
- 125 A 3 Phase Distribution Board (4–24 Way) with SPD – complete with 4 P main switch and SPD protection.
- TPN Extension Box – 14 Module – expand your existing board capacity.
- TPN Spreader Box – extend outgoing ways for larger systems.
- TPN Single Phase Conversion Kit – copper link for adapting WTPN boards.
Trust & Compliance
All 125 A TPN boards are BS EN 61439 tested and built for long-term commercial performance. Backed by our UK stock with next-day delivery and a 2-year manufacturer warranty, installers can specify with confidence.
FAQs
What is a TPN board?
A TPN (Triple Pole + Neutral) board is a three-phase distribution unit with a neutral bar, used for commercial and industrial supplies.
Why choose a 125 A rated board?
125 A incomers provide sufficient capacity for most medium-scale commercial installs without oversizing.
Is SPD protection mandatory?
Yes – Amendment 2 of the 18th Edition requires surge protection in most installations, especially commercial and public buildings.
Related Categories
- Three Phase Boards & Protection
- Surge Protection Devices (SPDs)
- Main Switches & Rotary Isolators
- Enclosures
Not sure which TPN board suits your install? Contact our technical team for guidance on selection and compliance.