Why Choose the Mersen H331138 UltraSafe™ US142I Fuse Holder?
The Mersen H331138, also identified as the US142I, is a high-performance two-pole modular fuse holder designed for reliable protection of industrial power circuits, machinery and semiconductor equipment. Part of the advanced Mersen UltraSafe™ US14 range, it accepts standard 14 × 51 mm cylindrical fuse-links and combines compact installation with dependable electrical safety.
This model includes an integrated visual blown-fuse indicator, allowing maintenance personnel to identify an operated fuse quickly without extensive circuit testing. Its pressure-plate terminals provide secure conductor connections, while the finger-safe IP20 housing helps protect installers and operators during normal use and fuse replacement.
Rated at 50 A, up to 800 V AC and 1000 V DC, the H331138 is particularly suited to demanding applications such as variable speed drives, inverters, uninterruptible power supplies and industrial control systems. Its DIN rail mounting format enables straightforward installation in electrical panels and machine enclosures.
Key Advantages
- Designed for standard 14 × 51 mm cylindrical fuse-links.
- Two-pole configuration for protecting dual-conductor circuits.
- Integrated visual blown-fuse indicator supports rapid fault identification.
- 50 A current rating for industrial and power-electronic applications.
- Suitable for systems up to 800 V AC and 1000 V DC.
- Finger-safe IP20 protection, including during fuse replacement.
- Compact DIN rail mounting helps conserve control-panel space.
Key Features
- Mersen UltraSafe™ US14 series.
- Catalogue designation: US142I.
- Manufacturer item number: H331138.
- Two-pole modular fuse-holder design.
- Compatible with 14 × 51 mm cylindrical fuse-links.
- 50 A rated current.
- 800 V AC and 1000 V DC maximum voltage ratings.
- Integrated visual fuse-operation indicator.
- Pressure-plate terminal connections.
- DIN rail mounting for modular electrical panels.
- IP20 finger-safe construction.
- Lockable and sealable in open or closed position.
- Flame-retardant thermoplastic housing.
Reliable Protection for Power-Electronic Circuits
The Mersen H331138 securely accommodates two 14 × 51 mm cylindrical fuse-links to protect electrical equipment against overload and short-circuit conditions. Its high AC and DC voltage capabilities make it particularly suitable for modern power-conversion equipment and industrial systems operating at elevated voltages.
The visual blown-fuse indicator allows engineers to locate an operated fuse quickly, helping reduce diagnostic time and equipment downtime. Its robust pressure-plate connections and finger-safe construction also support secure, efficient maintenance in demanding industrial environments.
Typical Applications
- Variable speed drives and motor-drive systems.
- Industrial inverters and power converters.
- Uninterruptible power supply systems.
- Semiconductor protection circuits.
- Industrial machinery and automation panels.
- DC power distribution systems.
- Renewable energy and battery installations.
- OEM electrical equipment.
