Mersen A331154 UltraSafe US141I single-pole DIN rail fuse holder with visual blown fuse indicator for 14 x 51 mm cylindrical fuse links, rated 50 A and 750 V AC/DC.
£28.58
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.
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.
| Phase | Single Phase |
|---|---|
| Manufacturer | Mersen |
| Series | UltraSafe™ US14 |
| Catalogue number | US141I |
| Manufacturer item number | A331154 |
| Product type | Modular cylindrical fuse holder |
| Number of poles | 1 |
| Compatible fuse size | 14 × 51 mm |
| Rated current | 50 A |
| Rated voltage | 750 V AC/DC (UL) |
| Connection type | Pressure plate screw terminal |
| Wire size | 14 to 2 AWG copper |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Dimensions (H × W × D) | Approx. 107 × 26.5 × 94 mm |
| Operating temperature | -25°C to +60°C |
| Housing material | Flame-retardant thermoplastic |
| UPC | 782001310967 |
| HS Code | 85361050 |
| Country of Manufacture | Tunisia |
The A331154 (US141I) is a single-pole DIN rail fuse holder for 14 × 51 mm cylindrical fuse links used to protect industrial electrical circuits from overloads and short circuits.
Yes. The US141I features an integrated visual blown fuse indicator to help maintenance personnel quickly identify an operated fuse.
The fuse holder is designed for 14 × 51 mm cylindrical fuse links.
The US141I is rated for 50 A and up to 750 V AC/DC under UL ratings.
Yes. The UltraSafe™ US141I can be locked and sealed in both the open and closed positions to improve maintenance safety and lockout procedures.
Mersen UltraSafe™ fuse holders are trusted worldwide by electrical engineers, machine builders and panel manufacturers for delivering dependable circuit protection, enhanced operator safety and simplified maintenance.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...