Why Choose the Mersen W331150 UltraSafe™ US143M2I Fuse Holder?
The Mersen W331150, catalogue number US143M2I, is a premium 3-pole UltraSafe™ cylindrical fuse holder designed for demanding industrial control panels, machinery and power distribution systems. It accepts 14 × 51 mm cylindrical fuse links and combines visual blown fuse indication with two integrated microswitches for comprehensive local and remote fuse monitoring.
Rated for fuse currents up to 50 A, the US143M2I supports operating voltages of up to 800 V AC and 1000 V DC (UL) and 750 V AC (IEC). Its robust thermoplastic construction, pressure-plate terminals and IP20 finger-safe design provide dependable performance while enhancing operator safety during installation and fuse replacement.
The integrated visual indicators allow blown fuses to be identified immediately, while the two built-in microswitches provide remote signalling to PLCs, HMIs or alarm systems. This combination helps reduce fault-finding time, minimise downtime and improve maintenance efficiency in modern industrial automation systems.
Key Advantages
- Designed for 14 × 51 mm cylindrical fuse links.
- 3-pole configuration for three-phase protection.
- Integrated visual blown fuse indicators.
- Two built-in microswitches for remote monitoring.
- Supports up to 50 A fuse ratings.
- Rated up to 800 V AC and 1000 V DC (UL).
- IP20 finger-safe construction improves operator safety.
Key Features
- Mersen UltraSafe™ US14 series.
- 3-pole modular fuse holder.
- Compatible with 14 × 51 mm cylindrical fuse links.
- 50 A maximum fuse rating.
- 800 V AC / 1000 V DC UL rating.
- 750 V AC IEC rating.
- Visual blown fuse indication.
- Two integrated microswitches.
- Pressure-plate terminal design.
- DIN rail mounting with IP20 finger-safe protection.
Maximum Protection with Advanced Monitoring
The Mersen W331150 securely mounts three 14 × 51 mm cylindrical fuse links, protecting industrial circuits against overloads and short circuits while providing continuous monitoring capability. The integrated visual indicators allow maintenance personnel to identify an operated fuse immediately without additional test equipment.
Its dual microswitch arrangement enables remote indication to PLCs, SCADA systems or alarm circuits, allowing rapid fault diagnosis and reducing machine downtime. Combined with the UltraSafe™ finger-safe construction, the US143M2I delivers outstanding performance in demanding industrial environments.
Typical Applications
- Industrial control panels.
- Three-phase machinery.
- Motor control centres.
- Power distribution equipment.
- Industrial automation systems.
- Renewable energy installations.
- OEM electrical assemblies.
- Process manufacturing equipment.
