Mersen E331158 UltraSafe US221 single-pole modular fuse holder for 22 x 58 mm cylindrical fuse-links, rated at 125 A, 800 V AC UL and 1000 V DC UL.
£21.27
The Mersen E331158, catalogue reference US221, is a compact and dependable single-pole modular fuse holder designed for 22 × 58 mm cylindrical fuse-links. Part of the Mersen UltraSafe US22 series, it provides secure fuse mounting and electrical isolation for industrial power distribution, machinery protection and power conversion applications.
This fuse holder is rated for currents up to 125 A and supports operating voltages of up to 800 V AC and 1000 V DC under UL ratings. Under IEC ratings, it is suitable for systems up to 690 V AC or DC, making it suitable for a broad range of industrial and high-voltage DC applications.
The E331158 features an IP20 finger-safe construction that helps reduce accidental contact with live components, including during fuse replacement. Its DIN rail mounting format, pressure-plate terminals and clip-in fuse installation provide straightforward integration into switchboards, control panels and electrical equipment.
Cylindrical fuse holders provide a secure connection point for fuse-links used to protect electrical circuits from excessive current. When fitted with a correctly selected 22 × 58 mm fuse-link, the Mersen E331158 helps interrupt overload and short-circuit currents before they can damage cables, semiconductor devices or industrial equipment.
The high AC and DC voltage ratings make the US221 particularly suitable for power conversion equipment, motor drives, renewable energy systems and other applications where reliable high-voltage circuit protection is required. Its modular construction also allows compatible holders to be assembled into multi-pole arrangements where necessary.
| Phase | Single Phase |
|---|---|
| Manufacturer | Mersen |
| Series | UltraSafe US22 |
| Item number | E331158 |
| Catalogue number | US221 |
| Product type | Modular cylindrical fuse holder |
| Fuse size | 22 × 58 mm |
| Number of poles | 1 |
| Maximum fuse rating | 125 A |
| Conventional free-air thermal current | 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 |
| Terminal type | Pressure plate / clip |
| Terminal material | Tin-plated copper |
| Wiring range | 14 AWG to 1/0 AWG |
| Terminal torque | 4 N·m |
| Housing material | Polyamide |
| Mounting type | DIN rail according to EN 60715 |
| Dimensions (H × W × D) | 127.5 × 35 × 76.5 mm |
| Product weight | approximately 0.214 kg |
| RoHS compliant | Yes |
| EAN / UPC | 0782001311186 |
| HS Code | 85361090 |
| Country of Manufacture | Tunisia |
The Mersen E331158 is used to hold a cylindrical fuse-link that protects industrial AC or DC circuits against overloads and short circuits.
The E331158 is designed for standard 22 × 58 mm cylindrical fuse-links with a maximum rating of 125 A.
It is rated up to 800 V AC and 1000 V DC under UL specifications, or up to 690 V AC or DC under IEC specifications.
Yes. The UltraSafe fuse holder has an IP20 finger-safe design that helps prevent accidental contact with live components when correctly installed.
The fuse holder is mounted on a standard DIN rail according to EN 60715 and uses pressure-plate terminals for connecting the circuit conductors.
Mersen UltraSafe fuse holders are widely used by electrical engineers, panel builders and equipment manufacturers to provide reliable fuse protection, safe maintenance access and efficient integration into industrial electrical systems.
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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...