Why Choose the Mersen Y331152 UltraSafe US143NM Fuse Holder?
The Mersen Y331152, catalogue reference US143NM, is a durable 3-pole plus neutral modular fuse holder designed for 14 × 51 mm cylindrical fuse links. Part of the Mersen UltraSafe™ US14 range, it provides dependable circuit protection and safe fuse handling for industrial power distribution, motor protection and control-panel applications.
This fuse holder incorporates three auxiliary microswitches, allowing remote signalling of fuse status, pre-isolation or holder position when used with the appropriate fuse links and control circuitry. Its finger-safe construction provides an IP20 degree of protection, helping reduce accidental contact with live components during installation, maintenance and fuse replacement.
With ratings of up to 800 V AC and 1000 V DC under UL requirements, a maximum current rating of 50 A and a short-circuit current rating of 100 kA, the Y331152 is suitable for demanding electrical systems. Its compact modular housing mounts directly onto standard DIN rail, simplifying integration into switchboards, machinery panels and industrial control cabinets.
Key Advantages
- Designed for 14 × 51 mm cylindrical fuse links.
- 3-pole plus neutral configuration for three-phase circuits.
- Supplied with three auxiliary microswitches for remote signalling.
- Finger-safe IP20 construction supports safer fuse replacement.
- High electrical ratings of up to 800 V AC and 1000 V DC under UL requirements.
- DIN rail mounting enables quick installation inside electrical panels.
Key Features
- Mersen UltraSafe™ US14 modular fuse-holder series.
- US143NM catalogue reference.
- 3-pole plus neutral design.
- 50 A maximum fuse rating.
- 100 kA short-circuit current rating.
- Three integrated auxiliary microswitches.
- Pressure-plate terminals with tin-plated copper connections.
- Durable flame-retardant polyamide housing.
- Suitable for standard EN 60715 DIN rail mounting.
Safe and Reliable Industrial Circuit Protection
Modular fuse holders provide a secure connection between cylindrical fuse links and an electrical circuit. When an overcurrent or short circuit occurs, the installed fuse link interrupts the current to protect cables, machinery and connected electrical equipment from damage.
The Mersen UltraSafe™ design combines finger-safe operation with a compact modular format. The auxiliary microswitches can provide remote status information to PLCs, alarms or monitoring equipment, helping maintenance teams identify fuse operation or holder position more efficiently.
Typical Applications
- Three-phase industrial power distribution systems.
- Motor and transformer protection circuits.
- Machinery control panels and automation systems.
- Low-voltage switchboards and distribution panels.
- Industrial control and signalling circuits.
- Renewable energy and DC distribution equipment.
