125A TPN Distribution Boards with SPD for 3 Phase Installations
125A TPN distribution boards with SPD for commercial, industrial, and larger three-phase installs where reliable load distribution and surge protection are both required. These boards are supplied with a 4-pole main switch and integrated Type 2 surge protection, making them a practical choice for modern 3 phase distribution setups.
Available in 4 to 24 way formats, this range is suited to electricians and contractors specifying robust 3 phase distribution boards for workshops, plant areas, commercial units, and other demanding applications.
Quick answer: A 125A TPN board with SPD is used where you need a three-phase distribution board with a strong incomer rating and built-in surge protection. They are commonly specified for commercial and industrial installs where multiple outgoing circuits and a 3 phase supply are involved.
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Each board in this collection is built around a 125A 4-pole incomer and factory-configured surge protection arrangement, helping speed up specification and installation. Depending on the model, boards are designed for straightforward fitting and future expansion, with compatible accessories available where extra capacity is needed.
- 125A 4-pole main switch – suitable for heavier-duty three-phase distribution
- Integrated SPD setup – helps protect connected equipment from transient overvoltage
- 4 to 24 ways available – suitable for smaller and larger board layouts
- Commercial and industrial ready – ideal for workshops, plant, site services and unit distribution
Need expansion or related parts? See our TPN extension boxes, spreader boxes, and wider three-phase range. For delivery and returns, visit our delivery information and returns policy.
125A 3 Phase Distribution Board – 16 Way (WTPN16-125SP)
£235.20
The WTPN16-125SP is a 16-way 125A three-phase distribution board designed for larger commercial and industrial installations where a high number of outgoing circuits must be managed cleanly and compliantly. Supplied as standard with a 125A 4-pole main switch, an integrated Type 2 Surge Protection Device...
125A 3 Phase Distribution Board – 8 Way (WTPN08-125SP)
£179.95
The WTPN08-125SP is an 8-way 125A three-phase distribution board designed for commercial and industrial installations that require a higher number of outgoing circuits without moving to a full-size panel. It is supplied as standard with a 125A 4-pole main switch, an integrated Type 2 Surge...
125A 3 Phase Distribution Board – 6 Way (WTPN06-125SP)
£166.95
The WTPN06-125SP is a 6-way 125A three-phase distribution board designed for commercial, industrial, and larger domestic installations that require additional circuit capacity without stepping up to a full-size board. It is supplied as standard with a 125A 4-pole main switch, an integrated Type 2 Surge...
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...
125A TPN Boards for Three-Phase Distribution
A TPN distribution board is used to distribute power across a three-phase supply, typically in commercial and industrial environments where higher loads, multiple outgoing circuits, and a more robust board layout are needed. Choosing a 125A TPN board with SPD gives you strong incoming capacity together with built-in surge protection for the installation.
What TPN Means
TPN stands for triple pole and neutral. In practical terms, that means the board is designed for 3 phase distribution, with phases and neutral arranged for larger or more complex electrical systems than a standard single-phase consumer unit.
Why Choose a 125A TPN Board with SPD?
- Higher incomer capacity – suitable for larger three-phase applications
- Integrated surge protection – helps protect connected equipment from transient voltage events
- Multiple outgoing way options – available from 4 to 24 ways depending on circuit count
- Trade-ready board format – suited to commercial units, workshops, plant rooms and industrial distribution
- Expansion options available – compatible with extension and spreader accessories where required
Typical Applications
- Commercial premises – distributing three-phase loads across multiple outgoing circuits
- Industrial environments – where plant, machinery, and heavier loads require a robust board setup
- Workshops and units – for reliable 3 phase power distribution with surge protection included
- Larger installations – where future ways, accessories, or board expansion may be needed
Featured Boards & Accessories
- 125A 3 Phase Distribution Board – core TPN board option with SPD arrangement and 4-pole incomer.
- TPN Extension Box – 14 Module – expand board capacity where extra ways are needed.
- TPN Spreader Box – useful where outgoing circuit expansion is required.
- TPN Single Phase Conversion Kit – accessory option for compatible board adaptations.
How to Choose the Right Board Size
The right board depends on the number of outgoing circuits, the total connected load, and whether the installation is likely to expand later. Smaller boards may suit more compact plant or unit installs, while larger 12, 16 or 24 way TPN boards are often better where the system needs more flexibility from day one.
Used Alongside SPDs, Isolators & Three-Phase Accessories
These boards are commonly specified alongside wider three-phase boards and protection, standalone 3 phase surge protection devices, main switches and rotary isolators, and related three-phase boards & accessories.
FAQs on 125A TPN Distribution Boards
What is a TPN distribution board?
A TPN distribution board is a three-phase board that distributes power across three phases plus neutral. It is typically used in commercial and industrial settings rather than standard domestic installs.
What does SPD mean on a distribution board?
SPD stands for surge protection device. On a distribution board, it is used to help protect connected circuits and equipment against transient overvoltage events.
Why choose a 125A incomer?
A 125A incomer gives the board a higher current capacity, making it suitable for larger three-phase installations where a smaller incomer would be too limiting.
Are these boards suitable for single-phase installs?
These boards are primarily intended for three-phase applications. If you're working on a single-phase setup, it’s usually better to browse our consumer units or related enclosure ranges unless a compatible conversion approach is specifically required.
Why Buy 125A TPN Boards from Power & Data UK?
Power & Data UK supplies trade-focused electrical equipment backed by dependable UK stock, practical product selection, and fast delivery. Orders over £30 qualify for free UK mainland next-day delivery, and products are backed by a 2-year manufacturer warranty. For unwanted items, see our returns policy.