Mersen US3J3 - Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 3-Pole Pressure Plate IP65
Mersen

US3J3

Alternate Item Number: US3J3

UPC: 782001307738


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Overview

The Mersen US3J3 UltraSafe™ Modular Fuse Holder (SKU: US3J3) provides enhanced safety and ease of use for Class J fuses. Designed for 600VDC/VAC applications and rated for 30A, this 3-pole unit offers finger-safe protection to an IP20 grade under IEC standards. It accommodates Class J fuses and features a durable polyamide body. Installation is simplified with snap-mounting capabilities onto 35 mm DIN-rail, and a unique latch design allows for easy repositioning. The US3J3 is suitable for applications including 600-volt motors, transformers, lighting, heating, and control circuits. It is UL Listed (guide IZLT File E52283), CSA Certified (File 32169), and IEC Certified (60269-1, 60947-3). Terminal screws are Phillips/slot head with a suggested torque of 35 in-lbs, and the pressure plate connector accepts wire sizes from #2 to #14 AWG solid or stranded copper. Optional blown-fuse indicators are available for each pole. For added safety during maintenance, all units have provisions for locking in the open position. Recommended fuse usage includes AJT, A4J, and HSJ fuse types.
  • 3-Pole Class J Fuse Holder for 600VDC/VAC and 30A applications
  • IP20 Finger-Safe protection under IEC standards
  • Durable polyamide body construction
  • Snap-mounts to 35 mm DIN-rail for easy installation
  • UL Listed, CSA Certified, and 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
Current Rating
30A
DC Voltage Rating
600 V
Ip Rating
IP20/IP65
Material
Polyamide
Maximum Operating Temperature
80 C
Mounting
DIN Rail
Mounting Type
Snap-mounted to 35 mm DIN-rail
Number Of Poles
3-pole
Number of poles
3
Operating Temperature, Maximum
176 F
Phase
3
Poles
3
Series
UltraSafe
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
600VAC/600VDC
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
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 3-Pole LED Pressure Plate IP65

US3J3I

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 3-Pole LED Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 2-Pole Pressure Plate IP65

US3J2

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 2-Pole Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A N Pressure Plate IP65

US3JN

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A N Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 2-Pole LED Pressure Plate IP65

US3J2I

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 2-Pole LED Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 1-Pole LED Pressure Plate IP65

US3J1I

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 30A 1-Pole LED Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 3-Pole LED Pressure Plate IP65

US6J3I

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 3-Pole LED Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 3-Pole Pressure Plate IP65

US6J3

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 3-Pole Pressure Plate IP65
Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A N Pressure Plate IP65

USN

Fuse Holder UltraSafe™ 800VAC 1000VDC Midget 30A N Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 1-Pole Pressure Plate IP65

US6J1

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 1-Pole Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 2-Pole LED Pressure Plate IP65

US6J2I

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 2-Pole LED Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 1-Pole LED Pressure Plate IP65

US6J1I

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 1-Pole LED Pressure Plate IP65
Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 2-Pole Pressure Plate IP65

US6J2

Fuse Holder UltraSafe™ 600VAC 600VDC Class J 60A 2-Pole Pressure Plate IP65

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.