Square D PowerPact LJL44400WU31X L-Frame 4P 400A Mission Critical UM
600A Frame | 400A | 4P | 100kA@240V, 65kA@480V, 25kA@600V | Electronic Mission Critical (MicroLogic 3.3 LI)
The Schneider Electric Square D PowerPact LJL44400WU31X is a L-Frame molded case circuit breaker rated at 400 amperes for 4-pole applications in commercial and industrial power distribution systems. This premium breaker delivers extra-high interrupting capacity rated at 100kA@240V, 65kA@480V, 25kA@600V, operating at 480Y/277V AC for reliable overcurrent protection in critical electrical infrastructure. The LJL44400WU31X features a MicroLogic 3.3 LI electronic trip unit providing adjustable long-time delay, short-time delay, instantaneous, and ground fault protection settings for precise overcurrent coordination. This advanced electronic trip technology enables optimized protection curves, selective coordination with upstream and downstream protective devices, and significantly enhanced system reliability. This unit mount breaker features lug (unit mount) connections with AL400L61K4/AL600LS52K4 terminations, accepting (2) 2/0-500 kcmil Al/Cu conductors for versatile wiring applications. With overall dimensions of 10.24" H x 7.09" W x 5.67" D and weighing ~30 lbs, the LJL44400WU31X delivers L-Frame frame protection in a space-efficient package suitable for dense electrical equipment layouts. Certified to UL 489, CSA, and IEC/EN 60947-2 international standards, the LJL44400WU31X ensures compliance across diverse global markets and jurisdictions. This breaker serves commercial and industrial power distribution, feeder protection, motor circuit applications, and switchgear installations requiring dependable L-Frame frame interrupting performance. Backed by Schneider Electric's global expertise in power distribution solutions, the LJL44400WU31X ensures dependable protection for critical electrical infrastructure with comprehensive factory warranty coverage and support.
Key Features
This PowerPact MCCB features Electronic Mission Critical (MicroLogic 3.3 LI) trip protection rated 400A at 480Y/277V AC. Frame size: 600A. Interrupting capacity: 100kA@240V, 65kA@480V, 25kA@600V. Designed for reliable overcurrent protection in industrial and commercial power distribution systems.
Applications
Suitable for main distribution panels, motor control centers, switchboards, and feeder circuit protection in industrial facilities, data centers, and commercial buildings. Compliant with UL 489, CSA C22.2 No.5, IEC/EN 60947-2, NOM, CCC, CE.
