Mersen 4PD800 fourth fusible pole accessory designed for the Mersen M800D 800 A fusible disconnect switch, enabling a compatible four-pole fused isolation assembly.
£591.44
The Mersen 4PD800 is a genuine fourth fusible pole accessory designed for the compatible Mersen M800D fusible disconnect switch. It enables 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 M800D platform, the 4PD800 supports coordinated operation across the complete switch assembly. Its manufacturer-matched design helps maintain correct mechanical alignment, dependable switching performance and reliable circuit isolation in demanding industrial electrical systems.
Designed for the 800 A switch frame, the Mersen 4PD800 provides panel builders and electrical engineers with a practical solution for creating high-current four-pole fused disconnect assemblies. The accessory is particularly suitable for switchboards, motor control centres, machinery and industrial power distribution installations.
Four-pole disconnect assemblies are used where an additional conductor must be isolated and fuse-protected together with the main phase conductors. The Mersen 4PD800 adds this functionality to a compatible M800D switch, allowing coordinated switching across all four poles.
Using an original Mersen accessory helps preserve the mechanical compatibility and intended operating performance of the disconnect switch. The 4PD800 is therefore well suited to panel builders and engineers configuring high-current isolation and circuit protection equipment for industrial installations.
| Manufacturer | Mersen |
|---|---|
| Model | 4PD800 |
| Product type | Fourth fusible pole accessory |
| Compatible switch | Mersen M800D |
| Compatible switch rating | 800 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 4PD800 is used to add a fourth switched and fusible pole to a compatible Mersen M800D fusible disconnect switch.
The 4PD800 is specifically designed for use with the Mersen M800D fusible disconnect switch.
No. It is an accessory that adds a fourth fusible pole to a compatible M800D disconnect assembly. The main switch and appropriate fuse are supplied separately.
The accessory is designed for the compatible 800 A M800D switch frame.
It is typically fitted to an M800D switch within an industrial switchboard, motor control centre, power distribution panel 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 demanding 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...