Mersen M250D30S 250 A three-pole fuse switch disconnector for NH Size 1 fuse links featuring a 3+0 configuration and right-hand side operation for industrial power distribution.
£934.92
The Mersen M250D30S is a heavy-duty 250 A three-pole fuse switch disconnector designed to provide reliable switching, safe electrical isolation and integrated overcurrent protection for low-voltage industrial power distribution systems. Designed for use with NH Size 1 fuse links, it combines load-break switching with dependable fuse protection in a compact industrial assembly.
Featuring a 3+0 pole configuration with a right-hand side-operated mechanism, the M250D30S is ideal for switchboard layouts where side operation is preferred. It simultaneously disconnects all three phase conductors, providing a clearly defined isolation point for maintenance and servicing while helping to protect downstream equipment from overload and short-circuit faults.
Rated at 250 A for systems operating up to 690 V AC, the M250D30S is suitable for feeder circuits, industrial machinery, motor control centres and commercial electrical distribution equipment. When fitted with correctly selected NH fuse links, it delivers reliable protection and long-term operational performance.
The M250D30S combines manual switching with replaceable NH fuse protection, enabling operators to safely disconnect three-phase circuits while providing dependable protection against overloads and short-circuit faults. This integrated approach simplifies switchboard design and reduces the number of separate components required.
Its right-hand side-operated mechanism is particularly suited to custom panel layouts and industrial control systems. Selecting the appropriate NH fuse links allows protection characteristics to be matched to the connected load, cable sizing and fault level requirements of the installation.
| Current | 250 A |
|---|---|
| Manufacturer | Mersen |
| Model | M250D30S |
| Product type | Fuse switch disconnector |
| Rated current | 250 A |
| Rated operating voltage | 690 V AC |
| Frequency | 50 / 60 Hz |
| Number of poles | 3 |
| Pole configuration | 3+0 |
| Fuse-link size | NH Size 1 |
| Operation | Right-hand side operated |
| Mounting application | Switchboard / panel mounting |
| Applicable standard | IEC 60947-3 |
| Approximate weight | 4.15 kg |
The M250D30S is used to switch, isolate and protect three-phase electrical circuits in industrial power distribution systems and switchboards.
The M250D30S is designed for NH Size 1 fuse links.
The M250D30S has a rated current of 250 A.
The side-operated mechanism allows the switch to be integrated into switchboards where the operating handle is positioned on the side of the enclosure, providing greater installation flexibility.
Fuse links are normally selected separately so the current rating and protection characteristics can be matched to the application.
Mersen fuse switch disconnectors are trusted by switchboard manufacturers, OEMs and industrial electrical engineers for dependable circuit isolation, reliable overcurrent protection and long service life in demanding low-voltage power distribution systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...