Why Choose the Mersen E331158 UltraSafe US221 Fuse Holder?
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.
Key Advantages
- Compact single-pole fuse holder for 22 × 58 mm fuse-links.
- 125 A maximum current rating for demanding industrial circuits.
- UL voltage ratings of up to 800 V AC and 1000 V DC.
- IEC voltage ratings of up to 690 V AC and 690 V DC.
- IP20 finger-safe construction supports safer operation and maintenance.
- 100 kA short-circuit current rating for robust circuit protection systems.
- DIN rail mounting enables fast installation within standard electrical enclosures.
Key Features
- Mersen UltraSafe US22 series.
- US221 single-pole configuration.
- Compatible with 22 × 58 mm cylindrical fuse-links.
- 125 A maximum fuse and thermal current 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.
- Pressure-plate connection with tin-plated copper terminals.
- Clip-in fuse installation for straightforward replacement.
- Durable polyamide insulating housing.
Reliable Fuse Protection for Industrial Circuits
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.
Typical Applications
- Variable speed drives and motor control equipment.
- Industrial inverters and power converters.
- Uninterruptible power supply systems.
- Renewable energy and battery storage equipment.
- Industrial machinery and automation panels.
- Transformer and motor protection circuits.
- Low-voltage electrical distribution systems.
- Semiconductor protection applications.
