Why Choose the Mersen A331154 UltraSafe™ US141I Fuse Holder?
The Mersen A331154, catalogue number US141I, is a premium single-pole DIN rail fuse holder designed for 14 × 51 mm cylindrical fuse links. Part of the Mersen UltraSafe™ US14 series, it features an integrated visual blown fuse indicator, allowing maintenance personnel to identify an operated fuse quickly and safely.
Rated at 50 A and up to 750 V AC/DC under UL standards, the US141I combines high-performance circuit protection with industry-leading safety. Its IP20 finger-safe construction protects against accidental contact with live components, including during fuse replacement, making it ideal for industrial control panels, machinery and power distribution systems.
Designed for installation on a standard 35 mm DIN rail, the US141I incorporates pressure-plate terminals, a compact footprint and lockable operation. It is suitable for protecting motor drives, UPS systems, transformers, industrial machinery and other critical electrical equipment requiring dependable overcurrent protection.
Key Advantages
- Single-pole UltraSafe™ fuse holder for 14 × 51 mm cylindrical fuse links.
- Integrated visual blown fuse indicator for rapid fault identification.
- 50 A current rating for industrial applications.
- Rated up to 750 V AC/DC under UL standards.
- IP20 finger-safe protection during operation and fuse replacement.
- Compact DIN rail design saves panel space.
- Lockable and sealable in both open and closed positions.
- Compatible with optional auxiliary microswitch accessories.
Key Features
- Mersen UltraSafe™ US14 series.
- Catalogue number: US141I.
- Manufacturer item number: A331154.
- Single-pole modular fuse holder.
- Compatible with 14 × 51 mm cylindrical fuse links.
- Visual blown fuse indicator.
- 50 A rated current.
- 750 V AC/DC UL rating.
- Pressure-plate screw terminals.
- DIN rail mounting with IP20 protection.
Safe and Reliable Protection for Industrial Electrical Systems
The UltraSafe™ US141I securely houses 14 × 51 mm cylindrical fuse links while providing effective overcurrent and short-circuit protection. The integrated visual indicator allows maintenance engineers to identify blown fuses rapidly, reducing troubleshooting time and improving equipment availability.
Its compact modular design, finger-safe construction and optional remote indication accessories make the US141I an excellent choice for modern industrial control panels, OEM machinery and commercial electrical installations requiring reliable fuse protection.
Typical Applications
- Industrial control panels.
- Motor drives and variable speed drives.
- UPS systems.
- Transformer protection.
- Machinery and automation equipment.
- Power distribution systems.
- OEM electrical panel building.
