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.
