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.
