Mersen R331054 - Fuse Holder Modulostar® Size 14x51 IEC 690VAC 690VDC 3-Pole Microswitch compatible IP20
Mersen

R331054

Alternate Item Number: CMS143P

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Multiplier: 2

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Overview

The Mersen Modulostar® R331054 is a 3-pole modular fuse holder designed for 14x51mm IEC cylindrical fuse-links. This finger-safe unit offers an IP20 grade of protection, ensuring safety during fuse changes with a simple flick of the finger. Rated for 690VAC and 690VDC, it is suitable for a variety of industrial applications requiring reliable overcurrent protection. The modular design allows for flexible configurations, and multi-pole units can be field-assembled using a pin-ties assembly kit. This specific model is compatible with auxiliary microswitches, enabling remote indication of fuse status, a critical feature for system monitoring and control. Constructed from tough and durable thermoplastic material with a UL94V2 rating and flame retardant properties (glow wire flammability index to 960°C), the Modulostar® range prioritizes safety and longevity. It is designed for DIN rail mounting, facilitating straightforward installation within control panels and electrical enclosures. Recommended for use with Mersen US14 fuse-links, this fuse holder is ideal for protecting circuits in applications such as inverters, UPS systems, and motor drives where robust and safe electrical protection is paramount. SKU: R331054.
  • 3-Pole modular fuse holder for 14x51mm IEC cylindrical fuse-links
  • Rated for 690VAC and 690VDC operation
  • Finger-safe design with IP20 protection
  • Microswitch compatible for remote fuse status indication
  • DIN rail mounting for easy installation

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
Maximum Operating Temperature
60 C
Minimum Operating Temperature
-25 C
Mounting
DIN rail acc. EN 60715
Number of poles
3
Operating Temperature, Maximum
140 F
Operating Temperature, Minimum
-13 F
Size
3.01 x 3.13 x 4.36;76.5 x 79.5 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
Package Dimensions (L x W x H)
3.01 in x 3.13 in x 4.36 in
Package Dimensions (L x W x H)
76.5 mm x 79.5 mm x 110.8 mm
Package Weight (Imperial)
0.948 lb
Package Weight (Metric)
0.430 kg
Fuse Holder Modulostar® Size 14x51 IEC 690VAC 690VDC 3-Pole IP20

S331032

Fuse Holder Modulostar® Size 14x51 IEC 690VAC 690VDC 3-Pole IP20
Modular fuse holder 3P 600V

57050003

Modular fuse holder 3P 600V
10x38mm CYLINDRICAL FUSEHOLDER 81A ID. The CYH Series fuse holders are designed to hold cylindrical 10x38, 14x51 and 22x58 mm fuses. The CYH series features a compact IP20 touch-safe design for maximum space savings and safety. Features/Benefits: Compact design IP20 Finger-Safe Design. 35 mm DIN Rail Mountable. Made of a polymer high performance with a fusion temperature more than 300 °C. This provides a safety margin against a possible overheating of the fuse.

CYH10381ID

10x38mm CYLINDRICAL FUSEHOLDER 81A ID. The CYH Series fuse holders are designed to hold cylindrical 10x38, 14x51 and 22x58 mm fuses. The CYH series features a compact IP20 touch-safe design for maximum space savings and safety. Features/Benefits: Compact design IP20 Finger-Safe Design. 35 mm DIN Rail Mountable. Made of a polymer high performance with a fusion temperature more than 300 °C. This provides a safety margin against a possible overheating of the fuse.
E 90 50/125 fuse holders are appropriate to protect against overloads and short circuits. They are designed for use with cylindrical fuses from 50 to 125 A.

E93/125S

E 90 50/125 fuse holders are appropriate to protect against overloads and short circuits. They are designed for use with cylindrical fuses from 50 to 125 A.
Fuse holder FEC

18813000019

Fuse holder FEC
Terminal Covers (2 Covers Per Kit). Field installed primary and secondary IEC Touch Proof Cover Kit.

IP20

Terminal Covers (2 Covers Per Kit). Field installed primary and secondary IEC Touch Proof Cover Kit.
Control Transformer Accessories - Secondary Fuse Kit 3

SFK3

Control Transformer Accessories - Secondary Fuse Kit 3

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.