Square D PowerPact LJL34400WU44X L-Frame 3P 400A Mission Critical UM
600A Frame | 400A | 3P | 100kA@240V, 65kA@480V, 25kA@600V | Electronic Mission Critical (MicroLogic 6.3A LSIG)
Schneider Electric offers the Square D PowerPact LJL34400WU44X, a premium L-Frame 3-pole molded case circuit breaker delivering 400-ampere protection for critical electrical infrastructure and power distribution. With extra-high interrupting capacity of 100kA@240V, 65kA@480V, 25kA@600V, this MCCB operates at 480Y/277V AC to provide comprehensive and dependable circuit protection. The LJL34400WU44X features a MicroLogic 6.3A LSIG 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 LJL34400WU44X features unit mount configuration with lug (unit mount) connections and AL400L61K3/AL600LS52K3 terminations for straightforward installation. Accepting (2) 2/0-500 kcmil Al/Cu conductors, this breaker measures 10.24" H x 5.51" W x 5.67" D and weighs ~25 lbs, providing a compact footprint for space-efficient installation in panelboards, switchboards, and motor control centers. Certified to UL 489, CSA, and IEC/EN 60947-2 international standards, the LJL34400WU44X 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. As part of the proven PowerPact family, the LJL34400WU44X 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 6.3A LSIG) 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.
