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Overview
- Size D live parts for 3-inch ferrule diameter medium voltage fuse holders
- Compatible with Type EK (indoor) and Type EKO (outdoor) installations
- Mountable vertically or horizontally for flexible installation
- Includes live parts for both ends of the fuse holder
- Part of Mersen's Type EK 9F61 series for 2.4kV to 38kV circuits
Specifications
Application | Utilities Industrial Plants Hospitals Shopping Centers Schools Office Buildings |
Application | Medium Voltage Live Parts for 3 inch fuses |
Brand Name | Ferraz Shawmut |
Connection | Bus |
Mounting | Screw |
Mounting Type | Vertical or Horizontal |
Series | 9F61 |
Size | 3in |
Type | Accessories - Medium Voltage Fuses |
Type | IEEE MV Fuse Clips - Live Parts |
Voltage Rating | 2.4kV to 38kV |
Package Dimensions (L x W x H) | 4.88 IN x 4.99 IN x 4.99 IN |
Package Dimensions (L x W x H) | 12.3952 cm x 12.6746 cm x 12.6746 cm |
Package Weight (Imperial) | 2.400 L |
Package Weight (Metric) | 1.089 kg |
How to Install Mersen Medium Voltage Fuse Support or Disconnecting Switch
This guide provides instructions for installing Mersen Type EK/EKO medium voltage fuse supports or disconnecting switches, including mounting, electrical connections, and inserting Type EJ/EJO current-limiting fuse units.
Estimated time: 1h 30m
Tools needed:
Screwdriver, Fuse tongs, Wire strippers, Rigging equipment, Fuse hook, Multimeter
Supplies needed:
Mounting bolts, 1/2-inch spacers, Flexible connectors, Type EJ/EJO current-limiting fuse unit, Fuse unit fittings
- Prepare and Mount the Fuse Support or Disconnecting Switch
CAUTION: Ensure installation is performed by competent personnel familiar with good safety practices. Determine the correct mounting position: Type EK-1/EKO-1 supports can be vertical or horizontal with the fuse on top. Type EK-3/EKO-3 disconnecting switches must be vertical with the hinge support at the bottom. If mounting indoor units on a flat surface, place 1/2-inch spacers under the base for insulator bolt head clearance. Compare mounting holes with the structure. Attach rigging to the base, not insulators or contacts, during hoisting. Position the unit and ensure the base is supported evenly before tightening mounting bolts to prevent distortion.
- Make Electrical Connections to the Terminals
Clean and brighten all conductors before connecting them to the terminals. Ensure there are no dents or burrs on flat bars. Connect conductors firmly to the terminals. Do not subject the insulators to mechanical or thermal stresses from the conductors. If using bar or pipe connections from buses, provide flexible connectors unless the bus shape inherently eliminates strain from expansion and contraction.
- Assemble Fittings onto the Fuse Unit (for Disconnecting Switches only)
This step applies only to Type EK-3 or EKO-3 fuse disconnecting switches. Slide the appropriate fuse unit fittings onto the ferrules of the Type EJ/EJO fuse unit. For Size DD fuse units, attach the hinge fitting to the bottom ferrule of one tube and the operating eye to the top ferrule of the other tube. Ensure the hinge fitting is at the fuse's indicating target end for visibility. Seat the connecting block firmly in the hinge fitting's slot (for Size DD). Firmly tighten the slotted cap screws on the fittings with a hand screwdriver; avoid excessive force to prevent fuse body damage.
- Insert the Fuse Unit into the Support or Switch
CAUTION: Before inserting or removing a fuse, the circuit must be completely de-energized and grounded for fuse supports (EK-1/EKO-1), or completely open for fuse disconnecting switches (EK-3/EKO-3). Use fuse tongs to grip the fuse unit firmly. For fuse supports, insert the fuse and ensure it is firmly seated in the clip before removing the tongs. For disconnecting switches (C, D, or DD size), insert the point of the hinge fitting behind the hinge bolt, lower the unit until it rests on the bolt, then remove the tongs. Insert a fuse hook into the operating eye and rotate the blade into the closed position.
- Adjust the Fuse Disconnecting Switch (if needed)
If the fuse unit strikes one side of the clip more than the other in a disconnecting switch, loosen the bolts holding the hinge support to the lower insulator. Adjust the hinge support until the upper fuse ferrule enters the clips centrally. Once the correct adjustment is achieved, firmly tighten the hinge support bolts.
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.