Mersen M800D03 800 A three-pole IEC fused switch disconnector for NH Size 3 fuse links, designed for industrial switching, electrical isolation and overcurrent protection.
£2,613.71
The Mersen M800D03 is a heavy-duty IEC fused switch disconnector engineered to provide dependable load switching, positive electrical isolation and fuse-based overcurrent protection within industrial low-voltage power distribution systems. Rated at 800 A, it is designed for demanding applications including main switchboards, motor control centres and high-capacity distribution panels.
Designed for use with NH Size 3 fuse links, the M800D03 combines manual switching, circuit isolation and fuse protection within a single assembly. This integrated design simplifies switchboard construction while providing reliable protection against overload and short-circuit faults in three-phase electrical installations.
Featuring a three-pole configuration with a front-operated mechanism, the M800D03 is suitable for industrial installations operating at up to 690 V AC. Its robust construction delivers dependable performance in demanding manufacturing, infrastructure and power distribution environments.
Fused switch disconnectors combine manual circuit isolation with the high fault-current protection provided by NH fuse links. This enables electrical equipment to be safely disconnected before maintenance while protecting cables and downstream equipment from overload and short-circuit conditions.
The Mersen M800D03 simultaneously switches all three phases, creating a clearly defined isolation point for high-current industrial equipment. Appropriate NH Size 3 fuse links should be selected to suit the installation's electrical characteristics and protection requirements.
| Current | 800 A |
|---|---|
| Manufacturer | Mersen |
| Model | M800D03 |
| Product type | IEC fused switch disconnector |
| Rated current | 800 A |
| Rated operating voltage | Up to 690 V AC |
| Number of poles | 3 |
| Fuse size | NH Size 3 |
| Operating mechanism | Front operated |
| Primary function | Switching, isolation and overcurrent protection |
| Application | Industrial low-voltage power distribution |
| Mounting application | Panel / switchboard installation |
| Applicable standard | IEC 60947-3 |
The M800D03 is used to switch, isolate and provide fuse protection for high-current three-phase circuits in industrial low-voltage power distribution systems.
The Mersen M800D03 has a rated operational current of 800 A.
The switch is designed for NH Size 3 fuse links, allowing suitable fuse ratings to be selected according to the installation requirements.
Yes. The M800D03 is a fused switch disconnector that combines manual circuit isolation with fuse-based overload and short-circuit protection.
The switch has a three-pole configuration for simultaneous switching, isolation and protection of three-phase electrical circuits.
Mersen fused switch disconnectors are trusted by panel builders, OEMs and industrial electrical engineers for dependable high-current switching, secure electrical isolation and reliable fuse protection 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...