Littelfuse JLLN400 Class T Fuse 400A 125VDC Fast-Acting 20000A Interrupting Rating Knife-Blade Bolt-In

The JLLN Series fuses from Littelfuse represent a cutting-edge solution for protecting electrical systems, particularly in environments where surge-sensitive components are in play, such as variable speed drives and rectifiers. With a robust design that allows for extremely current limiting capabilities, these fast-acting fuses can interrupt damaging short circuit currents at speeds not achievable by traditional mechanical protectors, providing critical protection to individual electric services and meters. Capable of handling interrupting ratings up to 200,000 amperes, they are engineered to minimize equipment damage caused by the thermal and magnetic effects of overcurrents, making them essential for reliable operation in demanding applications. Additionally, their compact knife-blade/bolt-in package size means they require less panel area compared to larger fuse alternatives, optimizing space without compromising on safety and performance.

• Extremely current-limiting design minimizes short circuit damage
• Fast-acting opening protects surge-sensitive components quickly
• High interrupting rating of 20,000 A at 125 V dc
• Compact knife-blade bolt-in design saves panel space
• Suitable for surge-sensitive equipment like variable speed drives and rectifiers
• Rated for 300 V ac and 125 V dc for versatile applications
• Melamine body with bronze and copper caps for reliable insulation and conductivity
• Complies with UL, CSA, RoHS, and NEC safety and environmental standards
• Broad amperage range from 1 to 1200 A covers various power needs
• Protects individual electric services and meters

• Voltage: 300 V ac, 125 V dc
• Amperage Range: 1–1200 A
• Ampere Rating: 400 A
• Interrupting Rating: 20,000 A @ 125 V dc
• Opening: Fast-Acting
• Material: Melamine body, bronze/copper caps
• Standards & Compliance: UL Listed, CSA Certified, RoHS Compliant, NEC Rated
• Country of Origin: Mexico

Certification

ICP Test Report

RoHS Declaration

Datasheets