Why Choose the Mersen H331161 UltraSafe™ US221N Fuse Holder?
The Mersen H331161, also identified by the catalogue number US221N, is a robust modular 22 × 58 mm cylindrical fuse holder designed for reliable overcurrent protection in industrial power distribution, machinery and electrical control systems. Part of the Mersen UltraSafe™ US22 range, it combines one protected pole with an integrated neutral conductor.
The H331161 features a durable polyamide housing and an IP20 finger-safe design, including during fuse replacement. Its pressure-plate connection system supports secure conductor termination, while the DIN rail mounting format enables straightforward installation inside switchboards, control panels and industrial enclosures.
Rated at 125 A, up to 800 V AC under UL ratings and 1000 V DC under UL ratings, the H331161 is suitable for demanding AC and DC applications. Under IEC ratings, it supports up to 690 V AC or DC and provides a short-circuit current rating of 100 kA.
Key Advantages
- Designed for standard 22 × 58 mm cylindrical fuse-links.
- One-pole plus neutral configuration for circuits requiring a neutral conductor.
- 125 A current rating for demanding industrial applications.
- Suitable for systems up to 800 V AC and 1000 V DC under UL ratings.
- 100 kA short-circuit current rating supports dependable fault protection.
- Finger-safe IP20 construction, including during fuse changing.
- DIN rail mounting simplifies installation in modular control panels.
Key Features
- Mersen UltraSafe™ US22 series.
- Catalogue number: US221N.
- Manufacturer item number: H331161.
- 22 × 58 mm cylindrical fuse-holder format.
- Single protected pole plus neutral conductor.
- 125 A ampere rating.
- 800 V AC and 1000 V DC UL ratings.
- 690 V AC and 690 V DC IEC ratings.
- Pressure-plate conductor connection.
- Clip-in fuse installation method.
- DIN rail mounting in accordance with EN 60715.
- IP20 finger-safe polyamide housing.
- Compatible with optional microswitches for remote indication.
Reliable AC and DC Circuit Protection
The Mersen H331161 provides a secure mounting and connection point for 22 × 58 mm cylindrical fuse-links used to protect electrical equipment against overloads and short-circuit faults. Its high AC and DC voltage ratings make it suitable for industrial distribution systems, power conversion equipment and machinery operating at elevated voltages.
The integrated neutral conductor simplifies wiring in applications requiring a protected phase and neutral arrangement. Optional auxiliary microswitches may also be fitted to support remote fuse-status indication through alarms, PLCs or supervisory monitoring systems.
Typical Applications
- Industrial electrical distribution panels.
- Power conversion and inverter systems.
- Variable speed drive installations.
- Industrial machinery and automation equipment.
- Battery and DC power distribution systems.
- Commercial and industrial switchboards.
- OEM electrical control equipment.
- Renewable energy installations.
