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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.

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.

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Choosing a 125A TPN Board with SPD

Select the board from the load schedule, incoming supply and required outgoing circuits. The 125A headline rating, number of ways and integrated surge protection must all coordinate with the actual supply capacity, fault level and protective-device system.

Board Way Count

Choose from compact to larger boards by counting outgoing circuits, pole requirements and sensible spare capacity—not just the number of current loads.

Browse TPN Board Sizes →

SPD Arrangement

Integrated Type 2 surge protection provides a tidy board configuration where suitable. Confirm its system arrangement, backup protection and replacement details.

View Three-Phase SPDs →

Expansion & Accessories

Conversion kits, extension boxes and spreader boxes can support the installation, provided they are compatible with the selected board system.

View Board Accessories →

Specification Checklist

  • Supply capacity: confirm phases, neutral, earthing arrangement and available current
  • Load schedule: count single- and three-phase outgoing circuits and balance loads
  • Fault level: verify incomer and outgoing device breaking capacities
  • Way count: allow the modules required by each device plus suitable spare capacity
  • SPD and accessories: confirm compatibility, backup protection and conductor arrangements

Selection Guides

Related Categories

Three PhaseThree-Phase SPDsThree-Phase Boards & Accessories4-Pole MCBsMain Switches & Isolators

Trade support: UK-stocked products, manufacturer-backed specifications and fast dispatch. Check each product page for ratings, standards, stock status and delivery details before ordering.