Mersen T331148 US143M2 UltraSafe three-pole modular fuse holder for 14 x 51 mm cylindrical fuse links featuring two connected microswitches, 50 A rating, IP20 protection and DIN rail mounting.
£83.42
The Mersen T331148, catalogue reference US143M2, is a premium three-pole modular fuse holder engineered for reliable protection of industrial electrical systems using 14 × 51 mm cylindrical fuse links. As part of the proven Mersen UltraSafe™ US14 series, it combines high electrical performance with an innovative finger-safe design and dual microswitch functionality for advanced remote monitoring.
Unlike standard fuse holders, the US143M2 incorporates two connected microswitches, allowing enhanced remote indication of fuse status for PLCs, alarm systems and industrial automation equipment. Its pressure-plate terminals provide secure conductor termination, whilst the IP20 finger-safe construction enables safer fuse replacement during maintenance.
Rated for 50 A, with UL voltage ratings of 800 V AC and 1000 V DC, together with an IEC rating of 750 V AC, the Mersen T331148 is ideally suited to industrial machinery, switchboards, photovoltaic installations and automation systems requiring dependable overcurrent protection and remote monitoring.
The Mersen T331148 securely houses three cylindrical fuse links whilst providing dependable overcurrent protection for industrial electrical systems. Its UltraSafe™ finger-safe construction improves operator safety during installation and maintenance, whilst the dual microswitch arrangement provides enhanced monitoring capability for critical applications.
Designed for OEM machinery, industrial automation, power distribution systems and photovoltaic installations, the US143M2 helps reduce maintenance time by enabling remote indication of fuse operation through industrial control systems and monitoring equipment.
| Phase | Three Phase |
|---|---|
| Manufacturer | Mersen |
| Series | UltraSafe™ US14 |
| Item number | T331148 |
| Catalogue number | US143M2 |
| Product type | Modular cylindrical fuse holder |
| Fuse size | 14 × 51 mm |
| Number of poles | 3 |
| Rated current | 50 A |
| Rated voltage AC (UL) | 800 V |
| Rated voltage DC (UL) | 1000 V |
| Rated voltage AC (IEC) | 750 V |
| Frequency | 50 / 60 Hz |
| Microswitches | Two connected microswitches |
| Terminal type | Pressure plate |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| EAN / UPC | 0782001311100 |
| HS Code | 85361050 |
| Country of Manufacture | Tunisia |
The Mersen T331148 is a three-pole modular fuse holder designed for 14 × 51 mm cylindrical fuse links in industrial AC and DC electrical systems.
The US143M2 incorporates two connected microswitches, providing enhanced remote monitoring of fuse status for industrial control systems.
It is designed for standard 14 × 51 mm cylindrical fuse links.
The fuse holder is rated for 50 A, 800 V AC UL, 1000 V DC UL and 750 V AC IEC.
It is designed for DIN rail mounting using pressure-plate terminals for secure electrical connections.
Mersen UltraSafe™ fuse holders are trusted worldwide by OEMs, panel builders and industrial engineers for dependable circuit protection, advanced monitoring capabilities and long-term operational reliability.
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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...