Mersen E201254 - 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 20 amps DIII gauge ring .
Mersen

E201254

Alternate Item Number: 4086500008841

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Minimum Qty: 50

Multiplier: 50

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Overview

The Mersen D fuse-system, SKU E201254, is a first-generation screw fuse-system compliant with the German DIN standard, widely utilized in low-voltage distribution units. This DIII gauge ring fuse is designed for applications where non-trained personnel may need to replace fuse-links, ensuring operational safety and continuity. It features a rated voltage of 500V and a current rating of 20A, providing essential protection for cables and power lines against unacceptable overcurrents and short-circuit currents up to its nominal breaking capacity. The gG-rated D fuse-links also protect equipment and installations from the dynamic effects of high short-circuit currents. The D fuse range includes sizes NDZ, DII, DIII, DIV, and DV. This specific DIII model is engineered for reliable performance in industrial and commercial electrical distribution systems. Mersen, a specialist in electrical power and safety, offers this fuse-link as a dependable solution for safeguarding electrical infrastructure. Its adherence to DIN standards ensures compatibility with existing systems. The screw-type design facilitates secure connections. Ideal for low-voltage switchgear, motor control centers, and building management systems, the Mersen D fuse-system offers a cost-effective and reliable method for overcurrent protection.
  • Mersen D fuse-system, first-generation DIN standard screw fuse.
  • DIII gauge ring fuse, 500V, 20A.
  • Protects low-voltage distribution units, cables, and power lines.
  • Limits and cuts off overcurrents and short-circuit currents.
  • gG fuse-links protect against dynamic effects of high short-circuit currents.

Specifications

Application
protection of cables and power lines
Brand Name
Ferraz Shawmut
Connection Type
Gauge Ring
Current Rating
20 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
Package Dimensions (L x W x H)
1.75 IN x 1.75 IN x 0.69 IN
Package Dimensions (L x W x H)
4.445 cm x 4.445 cm x 17.526 mm
Package Weight (Imperial)
0.015 L
Package Weight (Metric)
0.007 kg
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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.

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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.