Mersen C331156 US141MI UltraSafe single-pole fuse holder for 14 × 51 mm fuse-links, rated up to 50 A, 800 V AC and 1000 V DC, with visual indication, microswitch and IP20 protection.
£45.21
The Mersen C331156, catalogue reference US141MI, is a compact, single-pole modular cylindrical fuse holder designed for reliable overcurrent protection in demanding industrial electrical systems. Part of the Mersen UltraSafe US14 series, it accepts 14 × 51 mm cylindrical fuse-links and combines high voltage capability with finger-safe construction.
The C331156 is rated for currents up to 50 A and supports operating voltages up to 800 V AC or 1000 V DC under UL ratings. It is also rated at up to 750 V AC or DC under IEC specifications, making it suitable for a broad range of industrial, renewable-energy, semiconductor and power-conversion applications.
This model incorporates both a visual fuse-status indicator and a microswitch. The visual indicator assists with local fault identification, while the microswitch enables remote signalling to a PLC, alarm circuit or monitoring system. Its DIN rail mounting, pressure-plate terminals and IP20 housing support safe, efficient installation inside control panels and electrical cabinets.
When fitted with an appropriately selected 14 × 51 mm fuse-link, the Mersen C331156 provides dependable protection against excessive current and short-circuit faults. Its high voltage ratings make it suitable for applications where conventional lower-voltage fuse holders may not provide adequate system capability.
The combined visual indicator and microswitch provide enhanced maintenance support. Engineers can identify fuse operation directly at the panel while also transmitting a status signal to remote monitoring equipment, helping reduce fault-finding time and improve equipment availability.
| Phase | Single Phase |
|---|---|
| Manufacturer | Mersen |
| Series | UltraSafe US14 |
| Item number | C331156 |
| Catalogue number | US141MI |
| Product type | Modular cylindrical fuse holder |
| Number of poles | 1 |
| Fuse size | 14 × 51 mm |
| 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 |
| Indication system | Visual indicator and microswitch |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting to EN 60715 |
| Fuse installation | Clip-in |
| Terminal type | Pressure plate / clip |
| Terminal material | Tin-plated copper |
| Wiring range | AWG 2–14 |
| Recommended terminal torque | 3.5 N·m |
| Housing material | Polyamide |
| Dimensions (H × W × D) | 110.8 × 26.5 × 76.5 mm |
| Product weight | Approximately 0.153 kg |
| EAN / UPC | 0782001310950 |
| RoHS compliant | Yes |
| HS Code | 85361050 |
| Country of Manufacture | Tunisia |
The Mersen C331156 holds a 14 × 51 mm cylindrical fuse-link that protects electrical circuits and equipment against overload and short-circuit currents.
The fuse holder is designed for 14 × 51 mm cylindrical fuse-links with a suitable current, voltage and utilisation category for the application.
The C331156 supports fuse ratings up to 50 A. Its UL voltage ratings are 800 V AC and 1000 V DC, while its IEC voltage ratings are 750 V AC and DC.
Yes. It includes a visual indicator and a microswitch, providing both local indication and remote electrical signalling.
The fuse holder mounts on a standard DIN rail in accordance with EN 60715 and uses pressure-plate terminals for secure conductor connection.
Mersen UltraSafe fuse holders are widely specified by panel builders, automation engineers and equipment manufacturers for safe, compact and dependable circuit protection in demanding AC and DC electrical systems.
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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...