Square D PowerPact LJL44400WU33X L-Frame 4P 400A Mission Critical UM
600A Frame | 400A | 4P | 100kA@240V, 65kA@480V, 25kA@600V | Electronic Mission Critical (MicroLogic 3.3S LSI)
Square D's PowerPact LJL44400WU33X L-Frame circuit breaker provides 400A 4-pole circuit protection engineered for commercial and industrial electrical distribution systems. Featuring extra-high interrupting capacity rated at 100kA@240V, 65kA@480V, 25kA@600V and operating at 480Y/277V AC, this breaker delivers proven and reliable overcurrent protection performance. The LJL44400WU33X features a MicroLogic 3.3S LSI 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. The LJL44400WU33X features unit mount configuration with lug (unit mount) connections and AL400L61K4/AL600LS52K4 terminations for straightforward installation. Accepting (2) 2/0-500 kcmil Al/Cu conductors, this breaker measures 10.24" H x 7.09" W x 5.67" D and weighs ~30 lbs, providing a compact footprint for space-efficient installation in panelboards, switchboards, and motor control centers. Compliant with UL 489, CSA C22.2 No.5, and IEC/EN 60947-2 international standards, the LJL44400WU33X carries multiple certifications for worldwide acceptance and specification. Ideal for commercial buildings, industrial facilities, data centers, healthcare facilities, and critical infrastructure power distribution requiring reliable 400A 4-pole overcurrent protection. As part of the proven PowerPact family, the LJL44400WU33X delivers dependable protection backed by Schneider Electric's extensive global engineering heritage and comprehensive industry-leading technical support resources.
Key Features
This PowerPact MCCB features Electronic Mission Critical (MicroLogic 3.3S LSI) 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.
