Mersen N331166 UltraSafe US222MI two-pole modular fuse holder for 22×58 mm cylindrical fuse links with visual blown fuse indicator, two integrated microswitches, IP20 protection and ratings up to 800 V AC and 1000 V DC.
£109.40
The Mersen N331166, catalogue reference US222MI, is a premium UltraSafe™ modular fuse holder designed for 22×58 mm cylindrical fuse links. Featuring a two-pole configuration, integrated visual blown fuse indication and two auxiliary microswitches, it provides reliable overcurrent protection whilst enabling both local and remote fuse-status monitoring for critical industrial applications.
Part of the trusted Mersen UltraSafe™ US22 series, the US222MI combines robust thermoplastic construction with IP20 finger-safe protection, ensuring safe installation and maintenance. The integrated microswitches can be connected to PLCs, alarm systems or SCADA equipment, allowing maintenance personnel to identify fuse operation quickly and minimise equipment downtime.
Rated for systems up to 800 V AC (UL), 690 V AC (IEC) and 1,000 V DC, with a maximum current rating of 125 A, the N331166 is ideal for industrial control panels, motor control centres, OEM machinery and power distribution equipment.
The Mersen N331166 combines dependable overcurrent protection with both local and remote monitoring capabilities. Its integrated visual indicator allows maintenance personnel to identify an operated fuse immediately, whilst the dual microswitches enable remote signalling to PLCs, HMIs or building management systems for improved maintenance efficiency.
Its UltraSafe™ finger-safe construction, compact modular format and high electrical ratings make it an excellent choice for industrial automation systems, machine building, renewable energy installations and electrical distribution equipment where maximum reliability is essential.
| Manufacturer | Mersen |
|---|---|
| Series | UltraSafe™ US22 |
| Model | US222MI |
| Manufacturer part number | N331166 |
| Product type | Modular cylindrical fuse holder |
| Fuse size | 22 × 58 mm |
| Number of poles | 2 |
| Rated current | 125 A |
| Rated voltage (UL AC) | 800 V AC |
| Rated voltage (IEC AC) | 690 V AC |
| Rated voltage (DC) | 1,000 V DC |
| Frequency | 50 / 60 Hz |
| Fuse indication | Visual blown fuse indicator |
| Auxiliary signalling | 2 integrated microswitches |
| Terminal type | Pressure plate |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting |
| HS Code | 85361090 |
| Country of Manufacture | Tunisia |
The N331166 is a two-pole modular fuse holder designed for 22×58 mm cylindrical fuse links used to protect industrial AC and DC electrical circuits.
The N331166 is designed specifically for 22×58 mm cylindrical fuse links.
Yes. It features an integrated visual blown fuse indicator together with two auxiliary microswitches for remote fuse-status monitoring.
The fuse holder is rated for 125 A and supports systems up to 800 V AC (UL), 690 V AC (IEC) and 1,000 V DC.
It is designed for DIN rail mounting inside industrial control panels, switchboards, machinery and power distribution systems.
Mersen UltraSafe™ fuse holders are trusted by OEMs, panel builders and industrial engineers worldwide for delivering dependable circuit protection, finger-safe operation and advanced local and remote fuse monitoring.
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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...