Mersen D201253 - 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  DII screw gauge ring .
Mersen

D201253

Alternate Item Number: 4086500009008

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Minimum Qty: 25

Multiplier: 25

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Overview

The Mersen D201253 is a DII size fuse-link from the first-generation D fuse-system, adhering to the German DIN standard. This fuse-system is still used in many installations. The D201253 is specifically designed for low-voltage distribution units where non-trained persons are allowed to change the fuse-links, ensuring safe and accessible protection. It offers reliable protection for electrical installations, cables, and power lines by limiting and interrupting unacceptable overcurrents and short-circuit currents up to its nominal breaking capacity. The D201253 features a 500 Volt rating and a 20 Amp current rating, with a DII screw gauge ring terminal for secure connection. Its gG classification ensures protection against both sustained overloads and the dynamic effects of high short-circuit currents, safeguarding equipment and installations. The D fuse range comprises the sizes NDZ, DII, DIII, DIV, and DV, with the D201253 being a key component within this established range for safeguarding equipment and installations. The D201253 is manufactured in the US. Its enduring use in existing installations highlights its effectiveness and the trust in the D fuse-system for critical protection needs.
  • Mersen D201253 DII fuse-link
  • 500 Volts, 20 Amps
  • German DIN standard compliance
  • DII size with screw gauge ring terminal
  • gG classification for overload and short-circuit protection

Specifications

Application
protection of cables and power lines
Brand Name
Ferraz Shawmut
Connection Type
Screw Gauge Ring
Current Rating
20 A
Series
D fuse-system
Size
DII
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)
0.030 L
Package Weight (Metric)
0.014 kg

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.