Eaton DFJ-400 High Speed Fuse - UL Listed, Class J

Amperage rating of 400 A provides robust protection for large motor loads and feeder circuits; the business impact is a lower risk of contact damage and reduced replacement costs. In practice, this means reliable protection for drives and switchgear in harsh plant environments, with predictable performance during startup transients. Interrupt ratings of 200 kAIC at 600 Vac and 100 kAIC at 450 Vdc enable selective coordination in high-energy circuits; this minimizes collateral damage and simplifies upstream protection schemes. The result is faster fault clearance without unnecessary tripping of adjacent equipment, improving overall line efficiency. Voltage ratings of 600 Vac or less and 450 Vdc or less cover a broad spectrum of industrial controls, from AC motor drives to DC bus feeders. This compatibility reduces the need for multiple fuses in stock and streamlines panel design and procurement. Class J construction paired with Clip-lock mounting delivers quick, secure installation in standard fuse blocks. The design minimizes field adaptation and promotes consistent seating, improving contact reliability and reducing field service time. Melamine tube construction provides arc-quenching properties and mechanical durability in demanding environments, while the non-indicating fuse simplifies maintenance planning. For field teams, the clip-lock and standard packaging support fast replacement during scheduled outages. Certifications include CE Marked, RoHS Compliant, UL Listed, and CSA Certified, supporting regulatory compliance and supplier audits. At 1.55 lb and a compact 2.13 in by 2.13 in cross-section with a 7.5 in height, the DFJ-400 fits compact panels without crowding adjacent components.