Mersen US3JPAK - Mersen UltraSafe modular class J fuseholders introduce a new level of safety and ease for installing or replacing class J fuses. UltraSafe fuseholders qualify as finger-safe to an IP20 grade of protection under IEC standards. The US3J accommodates 30A class J or IEC cylindrical 22x58mm fuses. The US6J accommodates 60A class J. UltraSafe fuseholders are available in compact 1, 2, or 3-pole units, with or without visual blown fuse indication. Multiple poles can be assembled in the field by ordering and installing pin-tie handles. US3J and US6J fuseholders can be mounted on 35mm DIN-rail. Body material is a tough and durable polyamide. 30A size pin tie kit series.
Mersen

US3JPAK

Alternate Item Number: 782001423506

UPC: 782001423506


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Overview

The Mersen US3JPAK UltraSafe 30A Class J fuseholder (SKU: US3JPAK) sets the industry standard for safe, modular fuse management in industrial electrical systems. Designed for 30A Class J or IEC 22x58mm cylindrical fuses, this UL-listed, CSA-certified, and IEC 60269-1/60947-3 compliant fuseholder delivers finger-safe IP20 protection under IEC standards, preventing accidental contact with live components during installation or maintenance. The polyamide body ensures durability in harsh environments while maintaining dimensional stability for long-term reliability. Key specifications include a 600V AC/DC voltage rating, 30A maximum current, and a 200kA minimum Short Circuit Current Rating (SCCR). The US3JPAK is available in 1, 2, or 3-pole configurations with optional visual blown-fuse indicators for each pole, enabling proactive maintenance and reducing downtime. Multi-pole assemblies can be field-configured using the US3JPAK pin-tie assembly kit (sold separately), allowing flexible system expansion without redesign. Installation is simplified with snap-mount compatibility for 35mm DIN-rails and a unique latch mechanism that stays open for easy fuse replacement and holder repositioning. Terminals accept #2 to #14 AWG solid or stranded copper wire, secured with pressure plate connectors and Phillips/slot head screws (35 in-lb torque recommended). The compact footprint (32.5mm W x 65mm D x 97.5mm H) maximizes panel space efficiency in motor control centers, transformers, lighting systems, heating circuits, and general industrial loads. Mersen’s UltraSafe series is engineered for applications requiring non-load disconnect functionality and high-reliability fuse protection. The US3JPAK is ideal for 600V motor circuits, transformers, and control panels where safety and compliance with UL, CSA, and IEC standards are critical. With a minimum indicator voltage of 90V AC or 115V DC (leakage <0.7mA at 600V), the optional blown-fuse indicators provide clear visual confirmation of fuse status without compromising safety.
  • Finger-safe IP20 protection compliant with IEC 60269-1 standards
  • Accommodates 30A Class J or IEC 22x58mm cylindrical fuses
  • Available in 1P, 2P, or 3P configurations with optional blown-fuse indicators
  • Snap-mounts to 35mm DIN-rail with open-position latch for easy fuse replacement
  • UL Listed (E52283), CSA Certified (C22.2 No. 6225-01), and IEC 60947-3 compliant

Specifications

Application
600V motors, transformers, lighting, heating, control circuits, general loads
Brand Name
Ferraz Shawmut
Class
Accessory
Special Features
Finger-safe IP20 protection Optional blown fuse indicator lights DIN-rail mount Compact footprint Quick, easy fuse change
Standard
UL Listed to standard 4248-8, File E52283 CSA Certified C22.2, Class 6225, File 32169
Type
UltraSafe
Voltage Rating
600 VAC
Package Dimensions (L x W x H)
1 IN x 1 IN x 1 IN
Package Dimensions (L x W x H)
25.4 mm x 25.4 mm x 25.4 mm
Package Weight (Imperial)
0.050 L
Package Weight (Metric)
0.023 kg
Mersen UltraSafe modular class J fuseholders introduce a new level of safety and ease for installing or replacing class J fuses. UltraSafe fuseholders qualify as finger-safe to an IP20 grade of protection under IEC standards. The US3J accommodates 30A class J or IEC cylindrical 22x58mm fuses. The US6J accommodates 60A class J. UltraSafe fuseholders are available in compact 1, 2, or 3-pole units, with or without visual blown fuse indication. Multiple poles can be assembled in the field by ordering and installing pin-tie handles. US3J and US6J fuseholders can be mounted on 35mm DIN-rail. Body material is a tough and durable polyamide. 60A size pin tie kit series.

US6JPAK

Mersen UltraSafe modular class J fuseholders introduce a new level of safety and ease for installing or replacing class J fuses. UltraSafe fuseholders qualify as finger-safe to an IP20 grade of protection under IEC standards. The US3J accommodates 30A class J or IEC cylindrical 22x58mm fuses. The US6J accommodates 60A class J. UltraSafe fuseholders are available in compact 1, 2, or 3-pole units, with or without visual blown fuse indication. Multiple poles can be assembled in the field by ordering and installing pin-tie handles. US3J and US6J fuseholders can be mounted on 35mm DIN-rail. Body material is a tough and durable polyamide. 60A size pin tie kit series.
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Unclassified Transformrs. Small Core & Cl Tran. 9t58 Ip C&C Kit Xfrmr. Fuse Kits For EncapsulTED Xfmrs. 0000G24
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CYH10383

10x38mm CYLINDRICAL FUSEHOLDER 10 83A. The CYH Series fuse holders are designed to hold cylindrical 10x38, 14x51 and 22x58 mm fuses. The CYH series features a compact IP20 touch-safe design for maximum space savings and safety. Features/Benefits: Compact design IP20 Finger-Safe Design. 35 mm DIN Rail Mountable. Made of a polymer high performance with a fusion temperature more than 300 °C. This provides a safety margin against a possible overheating of the fuse.
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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.