Mersen L218671 - The D fuse-system is the first generation of screw fuse-system in the german DIN standard. It is still used in many installations. Applications are low voltage ditribution units, where non trained persons are allowed to change the fuse-links. The D fuse range comprises the sizes NDZ, DII, DIII, DIV, DV. The range of applications for D fuse-links is the protection of cables and power lines. They limit and cut-off unacceptable overcurrents and short circuit currents up to their nominal breaking capacity. D fuse-links gG also protect equipments and installations against dynamic effects of high short circuit currents. 500 Volts 63 amps DIII screw cap (long) .
Mersen

L218671

Alternate Item Number: 4029155125648

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Multiplier: 25

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Overview

The Mersen D fuse-system (SKU: L218671) is a DIN-compliant, first-generation screw fuse-system designed for low-voltage distribution units where non-trained personnel may handle fuse replacement. This DIII size fuse-link delivers robust performance with a 500V voltage rating and 63A current rating, making it ideal for protecting cables, power lines, and connected equipment from overcurrents and short-circuit currents up to its nominal breaking capacity. The DIII screw cap (long) design ensures secure installation and removal, minimizing improper handling risks while maintaining compliance with stringent safety protocols. Engineered for reliability and ease of use, the D fuse-system is widely deployed in low-voltage distribution units across industrial, commercial, and infrastructure sectors. The gG type fuse-links offer dual protection by limiting dynamic effects of high short-circuit currents, safeguarding both installations and personnel. Industries such as manufacturing, data centers, healthcare facilities, and renewable energy systems rely on the D fuse-system for its proven performance in demanding environments. The DIN standard compliance ensures compatibility with a vast ecosystem of electrical components, making it a versatile choice for retrofits and new installations alike. Installation considerations include verifying voltage and current compatibility, ensuring proper torque during screw connection, and adhering to local electrical codes. Mersen’s reputation as a leader in electrical protection solutions stems from decades of innovation and adherence to global standards, providing customers with confidence in the longevity and reliability of their products. Whether protecting motor circuits, distribution panels, or branch circuits, the D fuse-system delivers consistent performance with minimal maintenance requirements. The DIII 63A 500V fuse-link (SKU: L218671) is a trusted, DIN-compliant solution for modern electrical infrastructure, balancing safety, durability, and ease of maintenance to reduce downtime and operational risks in mission-critical applications.
  • DIN-compliant screw fuse-system (first generation) for low-voltage distribution
  • DIII size with 63A current rating and 500V voltage rating
  • Long screw cap design for secure installation and easy replacement
  • gG type fuse-links protect against overcurrents and short-circuit currents
  • Suitable for industrial, commercial, and infrastructure applications

Specifications

Application
protection of cables and power lines
Brand Name
Ferraz Shawmut
Connection Type
Screw
Current Rating
63 A
Series
D fuse-system
Size
DIII
Standard
DIN VDE 0636-301
Type
DIN LV Fuse-Links D
Voltage Rating
500 VAC
Voltage Rating
500 V V
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Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

LCC5

POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in

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.