Mersen M400D03 three-pole fused switch disconnector rated at 400 A for industrial low-voltage switching, circuit isolation and fuse-based electrical protection.
£1,191.14
The Mersen M400D03 is a heavy-duty fused switch disconnector designed to provide dependable switching, circuit isolation and fuse-based protection within industrial low-voltage electrical systems. With a rated current of 400 A, it is suitable for power distribution applications requiring robust performance and a secure means of disconnecting equipment from the electrical supply.
Combining switching and fuse protection within a single assembly, the M400D03 helps simplify the design of industrial switchboards and control panels. The switch enables circuits to be manually isolated for inspection or maintenance, while compatible fuse links provide protection against overloads and short circuits.
The Mersen M400D03 features a three-pole configuration for three-phase electrical systems and an operating arrangement identified as 0-2 / 0+3 positions. Its durable construction makes it suitable for panel builders, OEMs and electrical engineers working with industrial distribution equipment, motor circuits and machinery installations.
Fused switch disconnectors combine the functions of a manually operated isolating switch with the protection provided by electrical fuse links. This arrangement allows an installer or maintenance engineer to disconnect the circuit while also protecting cables and connected equipment against excessive current.
The Mersen M400D03 is designed for applications where dependable isolation and high-performance overcurrent protection are required. Its three-pole design enables simultaneous switching of the conductors in a three-phase circuit, helping support safe and efficient maintenance procedures.
| Current | 400 A |
|---|---|
| Manufacturer | Mersen |
| Model | M400D03 |
| Product type | Fused switch disconnector |
| Rated current | 400 A |
| Number of poles | 3 |
| Operating arrangement | 0-2 / 0+3 positions |
| Switch configuration | Three-pole |
| Protection method | Fuse-based overcurrent protection |
| Primary function | Switching, isolation and circuit protection |
| Application | Industrial low-voltage power distribution |
| Mounting type | Panel / switchboard mounting |
| Suitable system | Three-phase electrical circuits |
The M400D03 is used to switch, isolate and protect three-phase electrical circuits in industrial low-voltage power distribution systems.
The Mersen M400D03 has a rated current of 400 A.
Yes. The M400D03 is a fused switch disconnector that combines manual circuit isolation with fuse-based overcurrent protection.
The switch has a three-pole configuration suitable for switching three-phase electrical circuits.
It is commonly installed within industrial switchboards, distribution panels, motor control centres and OEM electrical assemblies.
Mersen fused switch disconnectors are used by panel builders, electrical engineers and industrial operators requiring reliable circuit isolation, effective fuse protection and robust performance in demanding power distribution applications.
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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...