Mersen 9F61CHM309 - Fuse supports, non-disconnecting, are used primarily in potential transformer circuits, or where there is some other disconnecting or isolating device in series with the fuse in the circuit. Disconnecting switch devices have the additional feature of serving to isolate the equipment they protect. It should be noted that disconnecting switches are not load-breaking devices, therefore, the circuit must be open prior to the fuse disconnection. Select either a fuse support or a disconnecting switch for each fuse. Fuse supports and disconnecting switches include live parts for both ends. Both fuse supports and fuse disconnect switches can be mounted vertically or horizontally. The type EK are used for indoor installations while the type EKO are used outdoors. 25800 Volts EKO-1D CHM series.
Mersen

9F61CHM309

Alternate Item Number: 9F61CHM309

UPC: 782001400903

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Overview

The Mersen 9F61CHM309 is a high-voltage outdoor fuse support designed for medium voltage applications up to 25.8kV. Part of Mersen's EKO-1D series, this non-disconnecting fuse support is engineered for potential transformer circuits and applications where an isolating device is already present in series with the fuse. Unlike disconnecting switches, this fuse support does not break load current, so the circuit must be open before fuse disconnection. The 9F61CHM309 features a 3-inch ferrule diameter (D size) and is rated for 25.8kV, making it suitable for outdoor installations where environmental durability is critical. The device includes live parts for both ends and can be mounted vertically or horizontally, providing installation flexibility in substations, switchgear, and industrial power distribution systems. Compatible with Mersen HP10NH series HelioProtection photovoltaic fuses, this fuse support ensures reliable protection in medium voltage circuits. The EKO-1D designation indicates outdoor-rated construction, with materials selected for UV resistance and weatherproof performance. Installation is straightforward with standard mounting hardware, and the fuse clips are designed to securely hold the fuse ferrule while maintaining electrical contact integrity. For applications requiring disconnect functionality, Mersen offers the EKO-3 series disconnect switches as an alternative. The 9F61CHM309 is manufactured in the USA and distributed by Gross Automation for immediate availability.
  • Rated for 25.8kV medium voltage applications
  • 3-inch ferrule diameter (D size) for NH series fuses
  • Outdoor-rated (EKO-1D) for harsh environmental conditions
  • Non-disconnecting design for use with series isolating devices
  • Vertical or horizontal mounting flexibility
  • Compatible with Mersen HP10NH HelioProtection fuses
  • Live parts included for both ends of the fuse
  • Manufactured in the USA by Mersen

Specifications

AC Voltage Rating
25.8 kV
Application
Utilities Industrial Plants Hospitals Shopping Centers Schools Office Buildings
Brand Name
Mersen
Connection
Bus
Material
Porcelain
Mounting
Screw
Mounting Type
Vertical or Horizontal
Number Of Poles
1
Series
CHM
Size
30 x 4 x 20.58 in
Size
762 x 101.6 x 522.732 mm
Sub Brand
Unassigned
Type
IEEE MV Fuse Supports
Voltage Rating
25800 VAC
Package Dimensions (L x W x H)
30 in x 4 in x 20.58 in
Package Dimensions (L x W x H)
762 mm x 101.6 mm x 522.732 mm
Package Weight (Imperial)
105.000 lb
Package Weight (Metric)
47.627 kg
Fuse supports, non-disconnecting, are used primarily in potential transformer circuits, or where there is some other disconnecting or isolating device in series with the fuse in the circuit. Disconnecting switch devices have the additional feature of serving to isolate the equipment they protect. It should be noted that disconnecting switches are not load-breaking devices, therefore, the circuit must be open prior to the fuse disconnection. Select either a fuse support or a disconnecting switch for each fuse. Fuse supports and disconnecting switches include live parts for both ends. Both fuse supports and fuse disconnect switches can be mounted vertically or horizontally. The type EK are used for indoor installations while the type EKO are used outdoors. 25800 Volts EKO-1C CHM series.

9F61CHM209

Fuse supports, non-disconnecting, are used primarily in potential transformer circuits, or where there is some other disconnecting or isolating device in series with the fuse in the circuit. Disconnecting switch devices have the additional feature of serving to isolate the equipment they protect. It should be noted that disconnecting switches are not load-breaking devices, therefore, the circuit must be open prior to the fuse disconnection. Select either a fuse support or a disconnecting switch for each fuse. Fuse supports and disconnecting switches include live parts for both ends. Both fuse supports and fuse disconnect switches can be mounted vertically or horizontally. The type EK are used for indoor installations while the type EKO are used outdoors. 25800 Volts EKO-1C CHM series.
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LFH60060-3C

600V CLASS H BLOCK 60A 3 POLE NON-ID

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.