Mersen F331159 US221I UltraSafe single-pole fuse holder with visual blown fuse indication for 22 x 58 mm cylindrical fuse-links, rated at 125 A, 800 V AC UL and 1000 V DC UL.
£37.56
The Mersen F331159, catalogue reference US221I, is a robust single-pole modular fuse holder with visual blown fuse indication, designed for use with 22 × 58 mm cylindrical fuse-links. Part of the Mersen UltraSafe US22 series, it provides reliable overcurrent protection for industrial power distribution, machinery and energy conversion systems.
The US221I combines high AC and DC voltage ratings with a finger-safe IP20 construction, including during fuse replacement when correctly installed. Its integrated visual indicator allows maintenance personnel to identify an operated fuse quickly, helping reduce troubleshooting time and equipment downtime.
With a rated current of 125 A, a UL voltage rating of 800 V AC and 1000 V DC, and an IEC rating of 690 V AC or 690 V DC, the F331159 is suitable for demanding industrial applications. Its compact DIN rail mounted format enables straightforward integration into control panels, switchboards and electrical enclosures.
The Mersen F331159 provides a secure mounting and connection point for a 22 × 58 mm cylindrical fuse-link used to protect electrical circuits against overloads and short circuits. When fitted with the correct fuse-link, it helps isolate excessive current before it can damage cables, semiconductor devices, machinery or power conversion equipment.
Its high AC and DC voltage capabilities make it suitable for applications including motor drives, renewable energy equipment, battery systems and industrial power distribution. The visual blown fuse indicator supports faster maintenance, while the compact modular design allows efficient installation within modern electrical panels.
| Phase | Single Phase |
|---|---|
| Manufacturer | Mersen |
| Series | UltraSafe US22 |
| Item number | F331159 |
| Catalogue number | US221I |
| Product type | Modular cylindrical fuse holder |
| Fuse size | 22 × 58 mm |
| Number of poles | 1 |
| Indication system | Yes |
| Indication type | Visual indicator |
| Current rating | 125 A |
| Maximum fuse rating | 125 A |
| Rated voltage AC, UL | 800 V AC |
| Rated voltage DC, UL | 1000 V DC |
| Rated voltage AC, IEC | 690 V AC |
| Rated voltage DC, IEC | 690 V DC |
| Rated insulation voltage | 750 V |
| Rated impulse withstand voltage | 8 kV |
| Frequency | 50 / 60 Hz |
| Short-circuit current rating | 100 kA |
| Protection rating | IP20 |
| Wiring range | 14 AWG to 1/0 AWG |
| Terminal material | Tin-plated copper |
| Terminal type | Clip |
| Fuse installation method | Clip-in |
| Terminal torque | approximately 4 N·m |
| Housing material | Polyamide |
| Mounting type | DIN rail according to EN 60715 |
| Dimensions (H × W × D) | approximately 127.5 × 35 × 76.5 mm |
| Product weight | approximately 0.217 kg |
| RoHS compliant | Yes |
| EAN / UPC | 0782001311261 |
| HS Code | 85361090 |
| Country of Manufacture | Tunisia |
The Mersen F331159 holds a 22 × 58 mm cylindrical fuse-link that protects industrial AC or DC circuits against overloads and short circuits.
The US221I is designed for standard 22 × 58 mm cylindrical fuse-links with a maximum rating of 125 A.
Yes. The fuse holder includes an integrated visual blown fuse indicator that helps identify an operated fuse quickly.
It is rated up to 800 V AC and 1000 V DC under UL specifications, and up to 690 V AC or 690 V DC under IEC specifications.
The fuse holder mounts onto a standard DIN rail according to EN 60715 inside a suitable electrical enclosure or control panel.
Mersen UltraSafe fuse holders are trusted by panel builders, electrical engineers and equipment manufacturers for dependable high-voltage circuit protection, safe fuse replacement and efficient fault identification.
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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...