Mersen M125F03 IEC fusible disconnect switch rated at 125 A with a three-pole 0+3 configuration for NH Size 2 (FR22) fuse links and industrial load switching.
£363.59
The Mersen M125F03 is a robust IEC fusible disconnect switch engineered to provide dependable load switching, electrical isolation and overcurrent protection in industrial power distribution systems. Rated at 125 A, this three-pole switch accepts DIN NH size 2 (FR22) fuse links, making it suitable for demanding three-phase installations requiring coordinated circuit protection.
Designed as part of the Mersen low-voltage disconnect switch range, the M125F03 combines a manually operated load-break switch with fuse protection in a compact assembly. The switch features a 0+3 pole configuration, allowing simultaneous isolation of all three phases while the installed fuse links provide protection against overloads and short circuits.
Suitable for industrial control panels, machinery, OEM equipment and commercial power distribution systems, the M125F03 delivers reliable switching performance together with the flexibility to select fuse ratings appropriate for the protected circuit.
Fusible disconnect switches combine manual switching with replaceable fuse links, providing both dependable circuit isolation and coordinated overcurrent protection. This arrangement enables operators to safely disconnect electrical equipment while the installed fuses help protect downstream circuits from overloads and fault currents.
The Mersen M125F03 is designed for demanding industrial applications where dependable switching, straightforward maintenance and reliable protection are required. Its compact design makes it suitable for machinery, switchboards and OEM electrical equipment.
| Current | 125 A |
|---|---|
| Manufacturer | Mersen |
| Model | M125F03 |
| Product type | IEC fusible disconnect switch |
| Rated current | 125 A |
| Number of poles | 3 |
| Pole configuration | 0+3 |
| Fuse system | DIN NH fuse links |
| Compatible fuse size | NH Size 2 (FR22) |
| Switching function | Load switching and electrical isolation |
| Protection | Overcurrent protection via installed fuse links |
| Mounting | Base / panel mounting |
| Applicable standard | IEC 60947-3 |
| Approximate weight | 1.5 kg |
The M125F03 is an IEC fusible disconnect switch used for load switching, electrical isolation and overcurrent protection in industrial three-phase electrical systems.
The switch has a rated current of 125 A.
The M125F03 is designed for compatible DIN NH Size 2 (FR22) fuse links. Fuse ratings should be selected according to the electrical application.
The 0+3 configuration indicates a three-pole switching arrangement where all three phases are mechanically operated together for simultaneous isolation.
It is commonly installed within industrial control panels, switchboards, motor control centres and OEM electrical equipment requiring fused load isolation.
Mersen IEC fusible disconnect switches are trusted by panel builders, OEMs and electrical engineers to provide dependable switching, coordinated fuse protection and reliable electrical isolation across industrial 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...