Mersen US3J3I - Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 3-Pole LED Pressure Plate IP65
Mersen

US3J3I

Alternate Item Number: US3J3I

UPC: 782001830847


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Overview

The Mersen US3J3I UltraSafe™ Modular Fuse Holder (SKU: US3J3I) provides enhanced safety and ease of use for Class J fuses. Designed for 600VDC and 600VAC applications, this 3-pole unit accommodates 30A Class J fuses, offering finger-safe protection to an IP20 grade under IEC standards. It features LED blown-fuse indicators for quick identification of fuse status. The US3J3I is constructed from durable polyamide and can be snap-mounted to a 35 mm DIN-rail, with a unique latch that stays open for easier re-positioning. Terminal screws are Phillips/slot head with a suggested torque of 35 in-lbs, and pressure plate connectors accept wire ranges from #2 to #14 AWG solid or stranded copper. This fuse holder is UL Listed (guide IZLT File E52283), CSA Certified (File 32169), and IEC certified (60269-1, 60947-3). Recommended fuse usage includes AJT, A4J, and HSJ series. Applications include 600-volt motors, transformers, lighting, heating, control circuits, and general loads, functioning as a non-load disconnect. Provisions for locking in the open position ensure safety during fuse changes or equipment servicing. The compact footprint and optional indicator lights contribute to efficient panel design and maintenance.
  • 3-Pole Class J Fuse Holder with LED Blown-Fuse Indicators
  • 600VDC / 600VAC Voltage Rating, 30A Current Rating
  • IP20 Finger-Safe Protection
  • Snap-Mounts to 35mm DIN-Rail
  • UL Listed, CSA Certified, IEC Certified

Specifications

AC Voltage Rating
600 V
Amperage Rating
30 A
Application
600 volt motors, transformers, lighting, heating, control circuits, general loads Non-load disconnect
Brand Name
Mersen
Class
Class J
Connection
Pressure Plate
DC Voltage Rating
600 V
Material
Polyamide
Maximum Operating Temperature
80 C
Mounting
DIN Rail
Number Of Poles
3-pole
Number of poles
3
Operating Temperature, Maximum
176 F
Phase
3
Size
4.49 x 3.84 x 3.15;114.046 x 97.536 x 80.01 in;mm
Special Features
Finger-safe IP20 protection Optional indicator lights DIN-rail mount Compact footprint Quick, easy fuse change
Standard
UL Listed, guide IZLT File E52283 CSA Certified C22.2, class 6225 01, File 32169 IEC certified 60269-1, 60947-3
Sub Brand
UltraSafe™
Type
UL/CSA Fuse Holders
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
4.49 in x 3.84 in x 3.15 in
Package Dimensions (L x W x H)
114.046 mm x 97.536 mm x 80.01 mm
Package Weight (Imperial)
1.430 lb
Package Weight (Metric)
0.649 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.