Littelfuse FLSR400 Class RK5 Time Delay Fuse 400 Amp 600V AC 300V DC

The Littelfuse FLSR400 is a UL Class RK5 dual-element time-delay fuse with knife-blade construction, designed to provide excellent protection for all types of circuits, especially those containing motors. This fuse is rated for 400 amps at 600 VAC or 300 VDC, with an impressive interrupting rating of 200 kA at 600 VAC and 20 kA at 300 VDC.

Key Features:

• Dual-element design with visual trip indication
• Knife-blade style terminal for secure mounting
• Time delay/slow blow operation protects against inrush currents
• Rejection-style design prevents incorrect fuse installation
• Compact dimensions: 2.594" diameter x 11.626" length
• Current-limiting design restricts fault currents for enhanced circuit protection

Common Applications:

• Service entrance switches and transformers
• Switchboard mains, feeder switches, and motor control centers
• Individual fused combination motor controllers
• Distribution panelboards and industrial control panels
• Protection of fully-rated panelboards and general purpose circuits

The FLSR series represents Littelfuse's most widely used fuse class, combining superior performance with reliable overload and short-circuit protection. This fuse meets UL 248-12, CSA, QPL, and CE approval standards.