Mersen B331155 UltraSafe US141M single-pole DIN rail fuse holder with integrated auxiliary microswitch for 14 x 51 mm cylindrical fuse links, rated at 50 A and 750 V AC/DC.
£32.19
The Mersen B331155, catalogue number US141M, is a premium single-pole DIN rail fuse holder designed for 14 × 51 mm cylindrical fuse links. As part of the Mersen UltraSafe™ US14 series, it incorporates an integrated auxiliary microswitch that enables remote monitoring of the fuse holder position for industrial automation and control systems.
Rated at 50 A and up to 750 V AC/DC, the US141M provides dependable circuit protection for industrial control panels, machinery, power distribution equipment and OEM applications. Its IP20 finger-safe construction helps protect operators from accidental contact with live parts, including during fuse replacement.
Designed for installation on a standard 35 mm DIN rail, the US141M features pressure-plate terminals, compact dimensions and lockable operation. The integrated microswitch allows the fuse holder status to be monitored by PLCs, SCADA systems or building management systems, helping improve maintenance efficiency and machine diagnostics.
The UltraSafe™ US141M securely accommodates a 14 × 51 mm cylindrical fuse link while providing reliable overcurrent protection. Its integrated auxiliary microswitch enables remote monitoring of the fuse holder operating position, allowing control systems to receive status information and improving preventive maintenance capabilities.
Its compact modular construction, finger-safe design and DIN rail mounting make the US141M an excellent choice for industrial automation systems, machinery and electrical control panels requiring dependable protection and remote indication.
| Phase | Single Phase |
|---|---|
| Manufacturer | Mersen |
| Series | UltraSafe™ US14 |
| Catalogue number | US141M |
| Manufacturer item number | B331155 |
| Product type | Modular cylindrical fuse holder with microswitch |
| Number of poles | 1 |
| Compatible fuse size | 14 × 51 mm |
| Rated current | 50 A |
| Rated voltage | 750 V AC/DC |
| Auxiliary indication | 1 integrated microswitch |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Approximate weight | 0.15 kg |
| Compliance | UL, CSA, CE, RoHS and REACH |
| HS Code | 85361050 |
| Country of Manufacture | Tunisia |
The B331155 (US141M) is a single-pole DIN rail fuse holder for 14 × 51 mm cylindrical fuse links with an integrated auxiliary microswitch for remote monitoring.
Yes. The US141M incorporates one integrated auxiliary microswitch for remote status indication and automation applications.
The fuse holder is designed for 14 × 51 mm cylindrical fuse links.
The US141M is rated for 50 A and up to 750 V AC/DC.
The fuse holder mounts directly onto a standard 35 mm DIN rail and is suitable for industrial control panels and electrical distribution equipment.
Mersen UltraSafe™ fuse holders are trusted worldwide by electrical engineers, machine builders and panel manufacturers for delivering dependable circuit protection, enhanced safety and reliable remote monitoring.
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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...