Mersen D331157 UltraSafe US141N modular fuse holder for 14 × 51 mm cylindrical fuse-links, rated up to 50 A with 1-pole plus neutral configuration, DIN rail mounting and IP20 finger-safe protection.
£34.64
The Mersen D331157, catalogue reference US141N, is a compact single-pole plus neutral modular fuse holder designed for safe and dependable overcurrent protection in industrial electrical systems. As part of the Mersen UltraSafe™ US14 series, it accommodates 14 × 51 mm IEC cylindrical fuse-links and is engineered for demanding industrial control panels, machinery, low-voltage distribution and renewable energy applications.
Rated for fuse-links up to 50 A, the US141N is suitable for systems operating at up to 800 V AC and 1000 V DC (UL) or 750 V AC/DC (IEC). The integrated neutral pole provides convenient neutral isolation alongside phase protection, making it ideal for single-phase installations requiring a switched neutral conductor.
The UltraSafe™ design incorporates a finger-safe IP20 enclosure, flame-retardant materials and DIN rail mounting for quick installation and maintenance. The holder is lockable and sealable in both the open and closed positions, providing additional safety during servicing.
The UltraSafe™ US141N combines dependable overcurrent protection with integrated neutral isolation, allowing installers to safely isolate both the phase and neutral conductors during maintenance. This configuration is particularly beneficial for industrial machinery, control circuits and power distribution applications where complete circuit isolation is required.
Its compact modular construction, finger-safe enclosure and DIN rail mounting make the US141N easy to install while providing long-term reliability in demanding industrial environments.
| Phase | Single Phase |
|---|---|
| Manufacturer | Mersen |
| Series | UltraSafe™ US14 |
| Item number | D331157 |
| Catalogue number | US141N |
| Product type | Modular fuse holder |
| Configuration | 1-pole + neutral |
| Fuse size | 14 × 51 mm |
| Maximum fuse rating | 50 A |
| Rated voltage (UL) | 800 V AC / 1000 V DC |
| Rated voltage (IEC) | 750 V AC / DC |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Short-circuit current rating | 100 kA (with suitable fuse-link) |
| Mounting type | DIN rail |
| Housing material | Flame-retardant thermoplastic (UL94 V-0) |
| Approximate weight | 0.30 kg |
| Package quantity | 3 |
| Compliance | IEC 60269, IEC 60947-3, UL, CSA, CE, RoHS and REACH |
| HS Code | 85361050 |
| Country of Manufacture | Tunisia |
The Mersen D331157 is a single-pole plus neutral fuse holder designed to install 14 × 51 mm cylindrical fuse-links for industrial circuit protection.
The US141N accepts standard 14 × 51 mm IEC cylindrical fuse-links.
The fuse holder supports fuse-links up to 50 A and is rated for 800 V AC / 1000 V DC (UL) or 750 V AC/DC (IEC).
No. The US141N is the standard version without a visual blown-fuse indicator or auxiliary microswitch.
The additional neutral pole enables simultaneous isolation of the neutral conductor alongside the protected phase, improving safety during maintenance and servicing.
Mersen UltraSafe™ fuse holders are trusted worldwide by panel builders, OEM manufacturers and industrial electricians for compact, dependable and finger-safe circuit protection in demanding industrial installations.
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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...