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MERSEN FUSE US143MI US143MI
Mersen S331147 US143MI UltraSafe three-pole modular fuse holder for 14 x 51 mm cylindrical fuse links, featuring visual indication, an integrated microswitch, pressure-plate terminals and IP20 protection.
£68.69
Why Choose the Mersen S331147 US143MI UltraSafe™ Fuse Holder?
The Mersen S331147, catalogue reference US143MI, is a robust three-pole modular fuse holder designed for safe and dependable protection of industrial electrical circuits. As part of the Mersen UltraSafe™ US14 series, it accommodates standard 14 × 51 mm cylindrical fuse links and combines high voltage capability with a compact DIN rail mounting format.
This fuse holder incorporates a visual blown-fuse indicator and an integrated microswitch, enabling operators to identify fuse operation locally while also providing a signal for remote monitoring systems. These features help maintenance teams locate faults quickly, reduce diagnostic time and improve the operational availability of industrial equipment.
With a rated current of up to 50 A, UL voltage ratings of 800 V AC and 1000 V DC, pressure-plate terminals and IP20 finger-safe protection, the Mersen S331147 is suitable for control panels, power distribution equipment, photovoltaic systems and demanding industrial automation applications.
Key Advantages
- Three-pole UltraSafe™ modular fuse holder for industrial circuit protection.
- Compatible with standard 14 × 51 mm cylindrical fuse links.
- Visual blown-fuse indication supports rapid fault identification.
- Integrated microswitch enables remote fuse-status monitoring.
- High voltage ratings support demanding AC and DC applications.
- IP20 finger-safe construction improves operator protection during maintenance.
Key Features
- Mersen UltraSafe™ US14 series.
- Three-pole modular fuse holder.
- Accepts 14 × 51 mm cylindrical fuse links.
- 50 A maximum rated current.
- 800 V AC UL rated voltage.
- 1000 V DC UL rated voltage.
- Integrated visual blown-fuse indicator.
- Built-in auxiliary microswitch.
- Pressure-plate terminal connections.
- DIN rail mounting with IP20 finger-safe protection.
Safe Fuse Protection with Local and Remote Indication
The Mersen S331147 securely houses three cylindrical fuse links and provides a convenient means of isolating and replacing fuses within industrial electrical systems. Its finger-safe construction reduces the risk of accidental contact with live components, including during normal fuse handling and maintenance procedures.
The combination of visual indication and an auxiliary microswitch supports both local inspection and integration with alarms, PLC inputs or supervisory systems. This allows fuse operation to be detected quickly, helping minimise production interruptions and simplify preventative maintenance.
Typical Applications
- Industrial control panels and automation cabinets.
- Power distribution and switchboard assemblies.
- Photovoltaic and high-voltage DC systems.
- Motor control centres and machinery protection.
- OEM production and processing equipment.
- Remote fuse-status monitoring systems.
Technical Specifications
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| Fuse Indication | Microswitch, Visual indicator | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 3-pole | |
| Device Type | Fuse base / holder | |
| Fuse Type | Cylindrical | |
| Fuse Size | 14x51 mm | |
| Current | 50 A | |
| Voltage | 800 V | |
| Manufacturer | Mersen | |
| Series | UltraSafe™ US14 | |
| Item number | S331147 | |
| Catalogue number | US143MI | |
| Product type | Modular cylindrical fuse holder | |
| Fuse size | 14 × 51 mm | |
| Number of poles | 3 | |
| Rated current | Up to 50 A | |
| Rated voltage AC UL | 800 V | |
| Rated voltage DC UL | 1000 V | |
| Frequency | 50 / 60 Hz | |
| Visual indicator | Yes | |
| Microswitch | Integrated | |
| Terminal type | Pressure plate | |
| Protection rating | IP20 | |
| Mounting type | DIN rail mounting | |
| EAN / UPC | 0782001311117 | |
| HS Code | 85361050 | |
| Country of Manufacture | Tunisia |
Frequently Asked Questions
What is the Mersen S331147 used for?
The Mersen S331147 is a three-pole modular fuse holder used to install and protect 14 × 51 mm cylindrical fuse links in industrial AC and DC electrical systems.
What is the catalogue reference for Mersen S331147?
The Mersen catalogue reference for item number S331147 is US143MI.
Does the S331147 include fuse indication?
Yes. It includes a visual blown-fuse indicator and an integrated microswitch for local and remote fuse-status indication.
What voltage ratings does this fuse holder support?
The S331147 has UL rated voltages of up to 800 V AC and 1000 V DC.
How is the Mersen S331147 installed?
It is designed for DIN rail mounting and uses pressure-plate terminals for secure conductor connections inside electrical panels and enclosures.
Trusted by Industrial Panel Builders Worldwide
Mersen UltraSafe™ fuse holders are widely used by panel builders, OEMs and electrical engineers for dependable circuit protection, finger-safe maintenance and reliable fuse-status monitoring.
