Why Choose the Mersen M250D30S Fuse Switch Disconnector?
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.
Key Advantages
- Combines load switching, isolation and fuse protection in a single device.
- 250 A rated current for demanding industrial applications.
- Designed for NH Size 1 fuse links.
- Three-pole 3+0 configuration for three-phase electrical systems.
- Right-hand side operation for flexible switchboard layouts.
- Suitable for industrial power distribution, feeder circuits and machinery protection.
Key Features
- Mersen fuse switch disconnector.
- 250 A nominal current rating.
- NH Size 1 fuse-link compatibility.
- Three switched poles in a 3+0 arrangement.
- Right-hand side-operated switching mechanism.
- Safe load-break switching capability.
- Replaceable fuse links for application-specific protection.
- Industrial-grade construction for switchboard installation.
Reliable Protection for Industrial Power Distribution
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.
Typical Applications
- Industrial switchboards.
- Power distribution panels.
- Motor control centres.
- Feeder circuit protection.
- OEM machinery and equipment.
- Commercial and industrial electrical installations.
