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Overview
- 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 |

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.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.










