Mersen 9F59UBD234 - ETP 15500V 40K / 25T Configuration: 234
Mersen

9F59UBD234

Alternate Item Number: 9F59UBD234

UPC: 782001401580


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Overview

The Mersen Sure Guard ETP back-up current-limiting fuse (SKU 9F59UBD234) is a high-voltage protective device designed for overhead distribution systems. Rated at 15,500V and 40kA interrupting capacity, this fuse limits high-fault current to safe levels when used in series with expulsion fuses or transformer cutouts. It provides external transformer protection (ETP) for both conventional and self-protected transformers. For conventional transformers, install in series with expulsion-fuse cutouts. For self-protected transformers, mount directly on the high-voltage bushing in series with the internal expulsion fuse. The 25T pole configuration ensures compatibility with standard distribution systems. Manufactured in the US by Mersen, a trusted leader in electrical protection solutions, this fuse meets rigorous industry standards for reliability and safety.
  • Voltage rating: 15,500V for overhead distribution systems
  • Interrupting capacity: 40kA for high-fault current protection
  • Pole configuration: 25T for standard compatibility
  • External transformer protection (ETP) for conventional and self-protected transformers
  • US-manufactured by Mersen, a leader in electrical protection solutions

Specifications

AC Voltage Rating
15500 V
Application
Short-circuit protection of overhead distribution systems
Body Material
Epoxy
Connection Material
Brass
Connection Type
Series with expulsion fuses or transformer cutouts
Current Rating
40 K
Current Rating
40 kA
Interrupt Rating
50 kA
Mounting Type
Direct mount on high-voltage bushing or in series with expulsion-fuse cutouts
Mounting Type
Series with expulsion fuse or transformer bushing
Poles
25T
Poles
1
Series
ETP
Series
Sure Guard ETP
Size
19.18 x 2.19;487.172 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
Voltage Rating
15500V
Package Dimensions (L x W x H)
19.18 in x 2.19 in x 2.19 in
Package Dimensions (L x W x H)
487.172 mm x 55.626 mm x 55.626 mm
Package Weight (Imperial)
6.251 lb
Package Weight (Metric)
2.835 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.