Mersen J1028959 UltraSafe US221 single-pole modular fuse holder for 22 × 58 mm cylindrical fuse-links, with a 125 A conventional thermal current rating, high AC and DC voltage capability, DIN rail mounting and IP20 protection.
£25.97
The Mersen J1028959, also identified as the US221, is a compact and dependable single-pole cylindrical fuse holder designed for industrial power distribution, machinery and electrical control applications. Part of the established Mersen UltraSafe™ US22 range, it accepts standard 22 × 58 mm cylindrical fuse-links and provides secure, finger-safe circuit protection.
This version is supplied without pre-breaking or auxiliary fuse-status indication, making it a straightforward solution for installations where remote monitoring is not required. Its pressure-plate terminals provide secure conductor connections, while the modular DIN rail format enables quick integration into control panels, switchboards and machine enclosures.
Designed for demanding AC and DC systems, the US221 fuse holder has a conventional thermal current rating of 125 A. The UltraSafe design supports ratings up to 800 V AC and 1000 V DC under UL specifications, while IEC applications are rated up to 690 V AC or DC.
The Mersen J1028959 provides a secure mounting and connection point for 22 × 58 mm cylindrical fuse-links. When fitted with an appropriately selected fuse, it helps protect industrial equipment against damaging overload and short-circuit currents.
Its high AC and DC voltage capability makes it suitable for power distribution, motor control, conversion equipment and renewable energy systems. The enclosed IP20 design also helps reduce accidental contact with live components during operation and routine fuse replacement.
| Manufacturer | Mersen |
|---|---|
| Series | UltraSafe™ US22 |
| Catalogue number | US221 |
| Manufacturer part number | J1028959 |
| Product type | Modular cylindrical fuse holder |
| Fuse size | 22 × 58 mm |
| Number of poles | 1 |
| Conventional thermal current | 125 A |
| Rated voltage AC, UL | Up to 800 V |
| Rated voltage DC, UL | Up to 1000 V |
| Rated voltage AC, IEC | Up to 690 V |
| Rated voltage DC, IEC | Up to 690 V |
| Frequency | 50 / 60 Hz |
| Indication | Without pre-breaking or electrical indication |
| Connection type | Pressure plate |
| Fuse installation | Clip-in |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Electrical supply type | AC / DC |
| EAN | 3605340533071 |
The J1028959 is designed for standard 22 × 58 mm cylindrical fuse-links.
The US221 has a single-pole configuration for protecting one electrical conductor.
No. This version is supplied without pre-breaking or an integrated electrical blown-fuse indication system.
The holder has a conventional thermal current rating of 125 A. It supports ratings up to 800 V AC and 1000 V DC under UL specifications and up to 690 V AC or DC under IEC specifications.
The fuse holder mounts onto a standard DIN rail inside an electrical control panel, switchboard or industrial equipment enclosure.
Mersen UltraSafe™ fuse holders are widely specified by panel builders, machine manufacturers and electrical engineers for reliable circuit protection, finger-safe operation and dependable performance in industrial AC and DC 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...