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 maintenance.

Ideal for commercial and industrial sites, this spreader box is fully compatible with the Whitecliffe WTPN range and can be fitted alongside your existing 3 phase TPN board.

• Distributes cables evenly across terminals to reduce heat build-up
• Built-in terminal bars for secure and consistent terminations
• Compatible with WTPN boards from Whitecliffe (top or bottom fit)
• Robust TPN pan and shrouded terminals for safety and durability
• 125A rated with secure busbar ends – ready for demanding installs

This unit helps improve compliance with BS EN 61439-3 by ensuring safer termination zones and better thermal performance in three-phase systems. For a complete setup, pair with our MCBs, RCBOs, and SPDs.