Mersen M250D03 250 A three-pole fuse switch disconnector for NH Size 1 fuse links with a 0+3 configuration for industrial power distribution and circuit protection.
£797.53
The Mersen M250D03 is a high-performance 250 A three-pole fuse switch disconnector designed for switching, isolation and overcurrent protection in low-voltage industrial power distribution systems. Designed for use with NH Size 1 fuse links, it combines dependable load-break switching with integrated fuse protection in a robust and compact assembly.
Featuring a 0+3 pole configuration and a front-operated mechanism, the M250D03 is ideally suited for industrial switchboards, feeder pillars, distribution panels and motor control centres. It provides simultaneous switching of all three phases, ensuring safe circuit isolation during maintenance and servicing.
Rated at 250 A for systems operating at up to 690 V AC, the M250D03 delivers reliable protection when fitted with the appropriate NH fuse links, helping safeguard cables, machinery and electrical equipment against overload and short-circuit faults.
The Mersen M250D03 combines manual switching with replaceable NH fuse protection, allowing electrical circuits to be safely isolated while protecting downstream equipment from overload and short-circuit conditions. This combination reduces component count and simplifies maintenance within industrial electrical installations.
The device is designed for demanding industrial environments and is widely used wherever dependable isolation and reliable overcurrent protection are required. Selecting the appropriate NH fuse links enables the protection characteristics to be matched to the connected equipment and installation.
| Current | 250 A |
|---|---|
| Manufacturer | Mersen |
| Model | M250D03 |
| Product type | Fuse switch disconnector |
| Rated current | 250 A |
| Rated operating voltage | Up to 690 V AC |
| Frequency | 50 / 60 Hz |
| Number of poles | 3 |
| Pole configuration | 0+3 |
| Fuse-link size | NH Size 1 |
| Operation | Front operated |
| Mounting application | Switchboard / panel mounting |
| Applicable standard | IEC 60947-3 |
The M250D03 is used to switch, isolate and protect three-phase electrical circuits in industrial power distribution systems.
This model is designed for NH Size 1 fuse links.
The M250D03 has a rated current of 250 A.
The 0+3 configuration indicates that the switch disconnects all three phase conductors while no neutral pole is switched.
Fuse links are generally selected separately so their current rating and protection characteristics can be matched to the installation.
Mersen fuse switch disconnectors are trusted by switchboard manufacturers, OEMs and industrial electricians for dependable circuit isolation, reliable overcurrent protection and long service life in demanding low-voltage 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...