Mersen L331026 - Fuse Holder Modulostar® Size 14x51 IEC 690VAC 690VDC 1-Pole+N With Microswitch IP20
Mersen

L331026

Alternate Item Number: CMS141NM

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Minimum Qty: 3

Multiplier: 3

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Overview

The Mersen L331026 Modulostar® fuse holder is a single-pole plus neutral (1P+N) modular fuse holder designed for IEC applications up to 690VAC and 690VDC. This Size 14x51 fuse holder meets IEC 60269 standards and features a microswitch for remote indication of blown fuses, enabling real-time system monitoring. The IP20 protection grade ensures finger-safe operation during fuse replacement, reducing the risk of electrical hazards. Constructed from durable thermoplastic or thermoset materials, the L331026 is built for long-term reliability in industrial power distribution and control circuits. The Modulostar® series supports field assembly of multi-pole units using pin-tie assembly kits, offering flexibility for custom configurations. Rated for 690VAC/VDC, this fuse holder is ideal for motor control centers, switchgear, and other high-voltage industrial applications where reliable fuse protection and signaling are critical. The L331026 is manufactured in the US and carries the UNSPSC code 39121624.
  • Single-pole plus neutral (1P+N) design for IEC applications
  • Rated for 690VAC and 690VDC, suitable for high-voltage systems
  • IP20 finger-safe protection during fuse changes
  • Integrated microswitch for remote blown-fuse indication
  • Modular design allows field assembly of multi-pole units with pin-tie kits

Specifications

AC Voltage Rating
690 V
Amperage Rating
50 A
Application
All circuits up to 690V for protection of motors, transformers, low voltage distribution, control circuits, drive protection Non-load operation
Brand Name
Mersen
DC Voltage Rating
690 V
IP Rating
IP20
Material
Thermoplastic/Thermoset
Maximum Operating Temperature
60 C
Minimum Operating Temperature
-25 C
Mounting
DIN rail acc. EN 60715
Mounting Type
Panel Mounting
Number Of Poles
2
Operating Temperature, Maximum
140 F
Operating Temperature, Minimum
-13 F
Poles
1-Pole+N
Poles
1P+N
Series
Modulostar
Size
Size 14x51
Size
14X51
Size
3.01 x 2.09 x 4.36;76.5 x 53 x 110.8 in;mm
Special Features
Finger safe Degree of protection: IP20 Optional visual blown fuse indicator DIN rail mounting Modular design Lockable Multi-pole assembly kit available Sealable in closed and open position Plastic material UL94V2 mini Flame retardant materials with glow wire flammability index to 960°C Shock and vibration tested for marine and railway applications
Standard
IEC 60269-2 and IEC 60947-3 Compliance RoHS Compliant Plastic material: NF 16101 & 16102 Requirement 2 Compliant
Sub Brand
Modulostar®
Type
IEC Cylindrical Fuse Holders
Voltage Rating
690VAC/690VDC
Package Dimensions (L x W x H)
3.01 in x 2.09 in x 4.36 in
Package Dimensions (L x W x H)
76.5 mm x 53 mm x 110.8 mm
Package Weight (Imperial)
0.691 lb
Package Weight (Metric)
0.313 kg
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Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.