Mersen Y331152 UltraSafe US143NM modular fuse holder for 14 x 51 mm cylindrical fuse links, featuring a 3-pole plus neutral configuration, three auxiliary microswitches, a 50 A rating and IP20 protection.
£95.67
The Mersen Y331152, catalogue reference US143NM, is a durable 3-pole plus neutral modular fuse holder designed for 14 × 51 mm cylindrical fuse links. Part of the Mersen UltraSafe™ US14 range, it provides dependable circuit protection and safe fuse handling for industrial power distribution, motor protection and control-panel applications.
This fuse holder incorporates three auxiliary microswitches, allowing remote signalling of fuse status, pre-isolation or holder position when used with the appropriate fuse links and control circuitry. Its finger-safe construction provides an IP20 degree of protection, helping reduce accidental contact with live components during installation, maintenance and fuse replacement.
With ratings of up to 800 V AC and 1000 V DC under UL requirements, a maximum current rating of 50 A and a short-circuit current rating of 100 kA, the Y331152 is suitable for demanding electrical systems. Its compact modular housing mounts directly onto standard DIN rail, simplifying integration into switchboards, machinery panels and industrial control cabinets.
Modular fuse holders provide a secure connection between cylindrical fuse links and an electrical circuit. When an overcurrent or short circuit occurs, the installed fuse link interrupts the current to protect cables, machinery and connected electrical equipment from damage.
The Mersen UltraSafe™ design combines finger-safe operation with a compact modular format. The auxiliary microswitches can provide remote status information to PLCs, alarms or monitoring equipment, helping maintenance teams identify fuse operation or holder position more efficiently.
| Phase | Three Phase |
|---|---|
| Manufacturer | Mersen |
| Series | UltraSafe™ US14 |
| Item number | Y331152 |
| Catalogue number | US143NM |
| Product type | Modular cylindrical fuse holder |
| Fuse size | 14 × 51 mm |
| Number of poles | 3-pole + neutral |
| Maximum fuse rating | 50 A |
| Rated voltage AC, UL | 800 V AC |
| Rated voltage DC, UL | 1000 V DC |
| Rated voltage AC, IEC | 750 V AC |
| Rated voltage DC, IEC | 750 V DC |
| Frequency | 50 / 60 Hz |
| Short-circuit current rating | 100 kA |
| Rated insulation voltage | 690 V |
| Rated impulse withstand voltage | 8 kV |
| Protection rating | IP20 |
| Indication system | Three auxiliary microswitches |
| Terminal material | Tin-plated copper |
| Housing material | Polyamide |
| Mounting type | DIN rail mounting to EN 60715 |
| Operating temperature | -25°C to +60°C |
| Dimensions (H × W × D) | approx. 110.7 × 53.1 × 76.5 mm |
| Product weight | approx. 0.62 kg |
| EAN / UPC | 0782001311063 |
| RoHS compliant | Yes |
| HS Code | 85361050 |
| Country of Manufacture | Tunisia |
The Mersen Y331152 is used to hold 14 × 51 mm cylindrical fuse links in three-phase plus neutral industrial electrical circuits.
The fuse holder has a 3-pole plus neutral configuration, making it suitable for three-phase electrical systems that require a neutral conductor.
The Mersen Y331152 has a maximum fuse and conventional thermal current rating of 50 A.
Yes. The US143NM includes three auxiliary microswitches that can be used for remote signalling of fuse operation, pre-isolation or holder position.
The fuse holder is designed for mounting onto a standard EN 60715 DIN rail inside an electrical control panel or switchboard.
Mersen UltraSafe™ modular fuse holders are trusted by electrical engineers, panel builders and equipment manufacturers for secure fuse installation, reliable circuit protection and safer maintenance in demanding industrial environments.
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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...