Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
MERSEN FUSE US143M2I US143M2I
Mersen W331150 US143M2I UltraSafe three-pole fuse holder for 14 x 51 mm cylindrical fuse links, rated up to 50 A with visual blown fuse indication, two integrated microswitches and IP20 finger-safe protection.
£75.32
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.
Technical Specifications
Tick the specs you need, then view products that match.
| Fuse Indication | Visual indicator | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 3-pole | |
| Device Type | Fuse base / holder | |
| Fuse Type | Cylindrical | |
| Fuse Size | 14x51 mm | |
| Voltage | 800 V | |
| Manufacturer | Mersen | |
| Series | UltraSafe™ US14 | |
| Item number | W331150 | |
| Catalogue number | US143M2I | |
| EAN / UPC | 0782001311124 | |
| Product type | Cylindrical fuse holder with indicators and microswitches | |
| Compatible fuse size | 14 × 51 mm | |
| Number of poles | 3 | |
| Maximum fuse current | 50 A | |
| Rated voltage AC (UL) | 800 V AC | |
| Rated voltage DC (UL) | 1000 V DC | |
| Rated voltage AC (IEC) | 750 V AC | |
| Frequency | 50 / 60 Hz | |
| Rated insulation voltage | 1000 V | |
| Rated impulse withstand voltage | 8 kV | |
| Short-circuit current rating | 200 kA with suitable fuse | |
| Indication system | Visual indicator and 2 integrated microswitches | |
| Terminal type | Pressure plate | |
| Mounting type | DIN rail to EN 60715 | |
| Protection rating | IP20 | |
| Housing material | Industrial thermoplastic | |
| Product weight | Approx. 0.46 kg | |
| Compliance | UL, CSA, IEC and RoHS compliant | |
| HS Code | 85361050 | |
| Country of Manufacture | Tunisia |
Frequently Asked Questions
What is the Mersen W331150 used for?
The W331150 is a three-pole UltraSafe™ fuse holder designed for 14 × 51 mm cylindrical fuse links, providing industrial circuit protection together with local and remote fuse monitoring.
What does the US143M2I designation mean?
US143M2I identifies a three-pole UltraSafe™ fuse holder fitted with visual blown fuse indicators and two integrated microswitches.
What fuse size does the W331150 accept?
The holder accepts 14 × 51 mm cylindrical fuse links with ratings up to 50 A.
What are the voltage ratings?
The W331150 is rated for 800 V AC and 1000 V DC under UL standards, together with a 750 V AC IEC rating.
What monitoring features are included?
The holder incorporates visual blown fuse indicators together with two integrated microswitches for remote signalling to PLCs, alarm systems and industrial monitoring equipment.
Trusted by Industrial Panel Builders Worldwide
Mersen UltraSafe™ fuse holders are trusted by OEM manufacturers, electrical panel builders and industrial engineers for high-performance circuit protection, advanced monitoring capability and enhanced operator safety.
