Littelfuse L50S400 Semiconductor Fuse 400A 500VAC 450VDC 20kAIC Very Fast-Acting

The L50S400 from Littelfuse is a high-performance fuse designed to provide exceptional current limiting capabilities, ensuring the safety and reliability of your electrical systems. With a low I2t and peak let-through current, it meets the demanding requirements of modern semiconductor applications, safeguarding sensitive equipment against overcurrent conditions. Featuring an impressive interrupting rating of 20,000A at 450VDC and accommodating AC interruption up to 200 kAIC, this fast-acting fuse is engineered to handle both present and future system demands effectively. Recognized by UL for its ability to offer supplementary protection in UL listed equipment, the L50S400 is an essential component for ensuring operational integrity in any robust electrical installation.

• Extremely current limiting protects sensitive semiconductor equipment
• Very fast-acting fuse for rapid overcurrent response
• High interrupting rating of 20,000A at 450VDC for fault protection
• Supports AC interruption up to 200 kAIC for robust electrical safety
• UL Recognized for supplementary protection in listed equipment
• Melamine body provides electrical insulation and durability
• Copper terminals with silver plating enhance conductivity and corrosion resistance
• Bolted tag mounting ensures secure and reliable installation
• Wide operating temperature range from -55°C to +125°C for diverse environments
• Compliant with RoHS and CSA standards for safety and environmental adherence

• Interrupting Rating: 20000A@450VDC, 200 kAIC AC
• Voltage: 500 Vac, 450 Vdc
• Amperage: 400 A
• Opening: Very Fast-Acting (FF)
• Fuse Torque: 15 N·m (132.76 in-lb) for 400 A, M8 (5/16") hardware
• Dimensions: A: 2.5 in (56.4 mm), B: 2.9 in (73.8 mm), C: 3.9 in (98.7 mm), D: 4.9 in (124.3 mm), E: 2 in (50.8 mm), F: 1.5 in (38.1 mm), G: 13/32 in (10.3 mm), H: 1/4 in (6.4 mm)
• Material: Body Melamine, Terminals Copper (silver plated)
• Mounting Type: Bolted Tags
• Operating Temperature: -55°C to +125°C
• Storage Temperature: Up to 35°C with <65% humidity
• Watts Loss at 100% Rated Current: 58 W
• Watts Loss at 80% Rated Current: 30 W
• Compliance: UL Recognized, RoHS Compliant, CSA Recognized
• Country of Origin: Mexico

Datasheets

Certification

Environmental Info