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.
Read more
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.
125A 3 Phase Distribution Board – 24 Way
£299.95
The WTPN24-125 is the largest model in our 125A three-phase distribution board series, offering 24 outgoing ways for extensive circuit distribution. Pre-fitted with a 125A 4-pole main switch and integrated Type 2 SPD, it’s built for large-scale industrial, commercial, or multi-unit residential projects that demand...
125A 3 Phase Distribution Board – 16 Way
£260.80
The WTPN16-125 is a 16-way 125A three-phase distribution board designed for industrial, commercial, and large residential projects requiring extensive outgoing circuit capacity. Supplied with a 125A 4-pole main switch and integrated Type 2 Surge Protection Device (SPD), it delivers safe, regulation-compliant power distribution for complex...
125A 3 Phase Distribution Board – 12 Way
£229.85
The WTPN12-125 is a 12-way 125A three-phase distribution board designed for commercial, industrial, and large domestic sites where a greater number of outgoing circuits are required. Pre-fitted with a 125A 4-pole main switch and integrated Type 2 Surge Protection Device (SPD), it offers reliable, regulation-compliant...
125A 3 Phase Distribution Board – 8 Way
£199.80
The WTPN08-125 is an 8-way 125A three-phase distribution board, built for commercial and industrial sites that require more outgoing circuits than the 4 or 6-way options. Fitted with a 125A 4-pole main switch and integrated Type 2 SPD, it provides safe, compliant distribution for medium-sized...
125A 3 Phase Distribution Board – 6 Way
£185.40
The WTPN06-125 is a 6-way 125A three-phase distribution board designed for commercial, industrial, and larger domestic installations needing a balance of compact size and additional circuit capacity. It comes pre-fitted with a 125A 4-pole main switch and integrated Type 2 Surge Protection Device (SPD), ensuring...
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.