Square D PowerPact LJL44400WU54X L-Frame 4P 400A Mission Critical UM
600A Frame | 400A | 4P | 100kA@240V, 65kA@480V, 25kA@600V | Electronic Mission Critical (MicroLogic 6.3E LSIG)
Engineered for demanding electrical systems, the Square D PowerPact LJL44400WU54X is a L-Frame 400A 4-pole molded case circuit breaker with extra-high interrupting capacity. Rated at 100kA@240V, 65kA@480V, 25kA@600V and operating at 480Y/277V AC, it provides reliable and consistent protection for power distribution infrastructure applications. The LJL44400WU54X features a MicroLogic 6.3E 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. Configured for unit mount installation, the LJL44400WU54X utilizes lug (unit mount) connections with AL400L61K4/AL600LS52K4 terminations designed for reliable conductor termination. The unit accommodates (2) 2/0-500 kcmil Al/Cu conductors within compact overall dimensions of 10.24" H x 7.09" W x 5.67" D weighing ~30 lbs, optimizing installation density in electrical distribution equipment. UL 489 listed and CSA C22.2 No.5 certified, the LJL44400WU54X meets IEC/EN 60947-2 international standards for global project specification and acceptance. Applications include feeder circuit protection, branch circuit protection, motor control center installations, panelboard and switchboard applications, and industrial power distribution systems requiring L-Frame frame-class protection capabilities. Backed by Schneider Electric's global expertise in power distribution solutions, the LJL44400WU54X ensures dependable protection for critical electrical infrastructure with comprehensive factory warranty coverage and support.
Key Features
This PowerPact MCCB features Electronic Mission Critical (MicroLogic 6.3E 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.
