Mersen 4PD400 fourth fusible pole accessory designed for the Mersen M400D 400 A fusible disconnect switch, enabling a compatible four-pole fused isolation assembly.
£412.19
The Mersen 4PD400 is a genuine fourth fusible pole accessory designed for the compatible Mersen M400D fusible disconnect switch. It allows a standard three-pole disconnect assembly to be expanded into a four-pole configuration, providing switched and fuse-protected isolation for an additional conductor.
Engineered for direct integration with the M400D switch platform, the 4PD400 supports dependable mechanical operation and coordinated switching across the complete assembly. It provides panel builders and electrical engineers with a practical way to configure four-pole fused isolation without replacing the main disconnect switch.
Designed for the 400 A switch frame, the Mersen 4PD400 is suitable for demanding industrial power distribution, machinery and control-panel applications. Its manufacturer-matched construction helps ensure correct fitment, reliable operation and long-term performance within compatible Mersen switchgear assemblies.
Four-pole disconnect assemblies are used where an additional conductor must be isolated together with the primary phase conductors. The Mersen 4PD400 adds a fourth switched and fusible pole to a compatible M400D assembly, helping provide coordinated isolation and circuit protection across all required conductors.
Using an original Mersen accessory helps maintain the correct alignment, mechanical compatibility and switching operation of the disconnect assembly. This makes the 4PD400 a dependable solution for panel builders and engineers configuring high-current fused isolation equipment.
| Manufacturer | Mersen |
|---|---|
| Model | 4PD400 |
| Product type | Fourth fusible pole accessory |
| Compatible switch | Mersen M400D |
| Compatible switch rating | 400 A |
| Pole function | Additional fourth switched and fusible pole |
| Switch type | Fusible disconnect switch |
| Application | Three-pole to four-pole switch expansion |
| Mounting type | Direct mounting to compatible switch assembly |
| Installation location | Electrical panel, cabinet or switchboard |
The Mersen 4PD400 is used to add a fourth switched and fusible pole to a compatible Mersen M400D fusible disconnect switch.
The 4PD400 is specifically designed for use with the Mersen M400D fusible disconnect switch.
No. It is an accessory that adds a fourth fusible pole to a compatible M400D disconnect assembly. The main switch and required fuses are supplied separately.
The accessory is designed for the compatible 400 A M400D switch frame.
It is typically fitted to an M400D switch within an industrial control panel, switchboard, motor control centre or machinery electrical cabinet.
Mersen disconnect switches and accessories are specified by panel builders, electrical engineers and OEM manufacturers for dependable circuit isolation, coordinated fuse protection and reliable performance in industrial power distribution systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...