Square D PowerPact LLL44400WU31X L-Frame 4P 400A Mission Critical UM
600A Frame | 400A | 4P | 125kA@240V, 100kA@480V, 50kA@600V | Electronic Mission Critical (MicroLogic 3.3 LI)
Schneider Electric offers the Square D PowerPact LLL44400WU31X, a premium L-Frame 4-pole molded case circuit breaker delivering 400-ampere protection for critical electrical infrastructure and power distribution. With very high interrupting capacity of 125kA@240V, 100kA@480V, 50kA@600V, this MCCB operates at 480Y/277V AC to provide comprehensive and dependable circuit protection. The LLL44400WU31X 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 LLL44400WU31X delivers L-Frame frame protection in a space-efficient package suitable for dense electrical equipment layouts. UL 489 listed and CSA C22.2 No.5 certified, the LLL44400WU31X 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 LLL44400WU31X 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: 125kA@240V, 100kA@480V, 50kA@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.
