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MERSEN FUSE US221I US221I
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.
£22.54
Why Choose the Mersen F331159 US221I UltraSafe Fuse Holder?
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.
Key Advantages
- Compact single-pole fuse holder for 22 × 58 mm fuse-links.
- Integrated visual blown fuse indicator for rapid fault identification.
- 125 A rated current for demanding industrial circuits.
- UL rated up to 800 V AC and 1000 V DC.
- IEC rated up to 690 V AC or 690 V DC.
- 100 kA short-circuit current rating supports high fault-current applications.
- IP20 finger-safe construction improves safety during operation and fuse replacement.
- DIN rail mounting simplifies panel installation and maintenance.
Key Features
- Mersen UltraSafe US22 series.
- US221I single-pole configuration.
- Compatible with 22 × 58 mm cylindrical fuse-links.
- Visual fuse status indicator.
- 125 A maximum fuse rating.
- 800 V AC UL rated voltage.
- 1000 V DC UL rated voltage.
- 690 V AC/DC IEC rated voltage.
- 100 kA short-circuit current rating.
- 8 kV rated impulse withstand voltage.
- Tin-plated copper clip terminals.
- Durable polyamide insulating housing.
Reliable High-Voltage Fuse Protection
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.
Typical Applications
- Industrial control panels and switchboards.
- Variable speed drives and motor control equipment.
- Renewable energy and solar power systems.
- Battery energy storage equipment.
- Power conversion and inverter systems.
- Transformer and machinery protection.
- Industrial automation equipment.
- AC and DC power distribution circuits.
Technical Specifications
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| Fuse Indication | Visual indicator | |
|---|---|---|
| Phase | Single Phase | |
| Poles | 1-pole | |
| Device Type | Fuse base / holder | |
| Fuse Type | Cylindrical | |
| Fuse Size | 22x58 mm | |
| Voltage | 800 V | |
| 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 |
Frequently Asked Questions
What is the Mersen F331159 used for?
The Mersen F331159 holds a 22 × 58 mm cylindrical fuse-link that protects industrial AC or DC circuits against overloads and short circuits.
What fuse size fits the F331159?
The US221I is designed for standard 22 × 58 mm cylindrical fuse-links with a maximum rating of 125 A.
Does the F331159 include a fuse indicator?
Yes. The fuse holder includes an integrated visual blown fuse indicator that helps identify an operated fuse quickly.
What voltage ratings does the US221I support?
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.
How is the Mersen F331159 installed?
The fuse holder mounts onto a standard DIN rail according to EN 60715 inside a suitable electrical enclosure or control panel.
Trusted for Industrial Electrical Protection
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.
