Mersen 9F59UBE122 - ETP 23000V 25K / 15T Configuration: 122
Mersen

9F59UBE122

Alternate Item Number: 9F59UBE122

UPC: 782001401764


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Overview

The Mersen Sure Guard ETP back-up current-limiting fuse (SKU 9F59UBE122) is a high-performance, series-connected protective device engineered for External Transformer Protection (ETP) in overhead distribution systems. Rated at 23,000V, this fuse delivers a 25,000A interrupting capacity, enabling it to safely interrupt high-fault currents while maintaining system reliability. Designed to operate in series with an expulsion fuse—such as a cutout—it limits fault current to safe levels before it can damage downstream equipment, ensuring full-range protection for conventional transformers and self-protected transformers with internal expulsion fuses. The 9F59UBE122 is specifically optimized for applications where expulsion fuses alone cannot provide adequate current limitation, making it a critical component in medium-voltage distribution networks. Manufactured in the United States, this fuse meets UNSPSC 39121626 standards for industrial electrical protection components, ensuring compliance with stringent safety and performance requirements. Its robust design and precise engineering make it a trusted solution for protecting transformers and associated infrastructure in utility and industrial power systems.
  • Voltage rating: 23,000V for overhead distribution systems
  • Interrupting capacity: 25,000A for high-fault current protection
  • Series configuration with expulsion fuses for full-range protection
  • External Transformer Protection (ETP) for conventional and self-protected transformers
  • Manufactured in the US with UNSPSC 39121626 compliance

Specifications

AC Voltage Rating
23000 V
Application
Short-circuit protection of overhead distribution systems
Body Material
Epoxy
Connection Material
Brass
Interrupt Rating
50 kA
Size
19.83 x 2.19;503.682 x 55.626 in;mm
Special Features
Various hardware options Current-limiting for superior equipment protection Weather-tight construction High fault current interrupting capability: I.R. Sym = 50kA at ETP voltage rating.
Type
Distribution Transformer Protection
Package Dimensions (L x W x H)
19.83 in x 2.19 in x 2.19 in
Package Dimensions (L x W x H)
503.682 mm x 55.626 mm x 55.626 mm
Package Weight (Imperial)
5.496 lb
Package Weight (Metric)
2.493 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.