MERSEN FUSE US142M2 US142M2

Q: What fuse size does the US142M2 accept?

It accepts standard 14 × 51 mm cylindrical fuse links rated up to 50 A.

Q: What voltage ratings does the fuse holder support?

The US142M2 is rated at 750 V AC (IEC), 800 V AC (UL) and 1000 V DC (UL).

Mersen L331141 US142M2 UltraSafe two-pole modular fuse holder for 14 x 51 mm cylindrical fuse links with two connected auxiliary microswitches, rated 50 A and IP20 finger-safe protection.

SKU: L331141Alt SKU: US142M2MPN: L331141

List Price £74.44 ex VAT

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£74.44

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Why Choose the Mersen L331141 US142M2 UltraSafe Fuse Holder?

The Mersen L331141, catalogue reference US142M2, is a premium two-pole modular fuse holder designed for 14 × 51 mm cylindrical fuse links. Part of the renowned Mersen UltraSafe™ US14 series, it delivers dependable overcurrent protection for industrial control panels, machinery, motor circuits and low voltage distribution systems.

Unlike standard fuse holders, the US142M2 is equipped with two connected auxiliary microswitches, allowing remote indication of fuse-holder status within PLCs, alarm systems and industrial monitoring equipment. Its finger-safe IP20 enclosure protects operators during normal use and fuse replacement, whilst the robust thermoplastic construction ensures long service life in demanding industrial environments.

Suitable for fuse links up to 50 A, the L331141 carries IEC ratings of 750 V AC together with UL ratings of 800 V AC and 1000 V DC. DIN rail mounting and pressure-plate terminals allow fast installation and secure cable termination for OEM machinery and industrial switchboards.

Key Advantages

Two-pole UltraSafe™ modular fuse holder.
Designed for 14 × 51 mm cylindrical fuse links.
50 A current rating.
Two connected auxiliary microswitches for remote monitoring.
IP20 finger-safe protection, including during fuse replacement.
DIN rail mounting for rapid installation.
Pressure-plate terminals provide secure conductor connections.
Suitable for demanding industrial AC and DC applications.

Key Features

Mersen UltraSafe™ US14 series.
Catalogue number: US142M2.
Manufacturer item number: L331141.
Two-pole configuration.
Accepts 14 × 51 mm cylindrical fuse links.
50 A rated current.
750 V AC IEC rating.
800 V AC / 1000 V DC UL ratings.
Two connected auxiliary microswitches.
Pressure-plate terminals.
DIN rail mounting.
IP20 finger-safe enclosure.

Reliable Circuit Protection with Remote Monitoring

The Mersen L331141 combines dependable cylindrical fuse protection with integrated auxiliary signalling, making it particularly suitable for industrial automation systems where remote monitoring is required. The connected microswitches enable control systems to detect fuse-holder status without direct visual inspection, improving maintenance efficiency and reducing downtime.

Its modular construction, DIN rail installation and finger-safe enclosure make the US142M2 an excellent choice for electrical panel builders, machine manufacturers and industrial maintenance engineers seeking reliable, standards-compliant circuit protection.

Typical Applications

Industrial control panels.
Motor protection circuits.
Transformer protection.
Machine building.
OEM automation systems.
Power distribution equipment.
Industrial monitoring and PLC-controlled installations.

Technical Specifications

Manufacturer	Mersen
Series	UltraSafe™ US14
Model	US142M2
Item number	L331141
Product type	Modular cylindrical fuse holder
Number of poles	2
Fuse size	14 × 51 mm
Rated current	50 A
Rated voltage (IEC)	750 V AC
Rated voltage (UL)	800 V AC / 1000 V DC
Frequency	50 / 60 Hz
Short-circuit current rating	100 kA
Protection rating	IP20
Mounting type	DIN rail
Terminal type	Pressure plate
Auxiliary signalling	Two connected microswitches
Body material	Thermoplastic / thermoset insulating material
Compliance	IEC, UL, CSA, RoHS and UKCA
HS Code	85361050
Country of Manufacture	Tunisia
Poles	2-pole
Device Type	Fuse base / holder
Fuse Type	Cylindrical
Fuse Size	14x51 mm
Current	50 A
Voltage	750 V

Frequently Asked Questions

What is the Mersen L331141 used for?

The L331141 is a two-pole modular fuse holder designed for 14 × 51 mm cylindrical fuse links in industrial electrical protection applications.

What fuse size does the US142M2 accept?

It accepts standard 14 × 51 mm cylindrical fuse links rated up to 50 A.

What are the auxiliary microswitches used for?

The integrated connected microswitches provide remote indication for monitoring circuits, PLCs and alarm systems.

What voltage ratings does the fuse holder support?

The US142M2 is rated at 750 V AC (IEC), 800 V AC (UL) and 1000 V DC (UL).

How is the Mersen L331141 installed?

The fuse holder mounts onto a standard DIN rail and uses pressure-plate terminals for secure conductor termination.

Trusted by Industrial Panel Builders Worldwide

Mersen UltraSafe™ fuse holders are trusted by electrical engineers, OEM manufacturers and panel builders for dependable overcurrent protection, finger-safe operation and advanced monitoring capabilities in industrial electrical systems.

UK delivery

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