Schneider Electric LJA34400WU31X PowerPact L I-Line Circuit Breaker

PowerPact L-frame I-Line circuit breaker, model LJA34400WU31X, is a 400 A, 3-pole device for 480Y/277 V AC systems, equipped with a Micrologic 3.3 electronic trip unit and rated 100% (ABC) for mission-critical applications. It uses I-Line mounting with an I-Line line connection and accepts AL600LS52K3 lugs; load conductors range from AWG 2/0 to 500 kcmil aluminum or copper. The circuit breaker provides an 80% continuous current rating, and its interrupting capacity is 35 kA at 480Y/277 V AC (65 kA at 240 V AC). Its dimensions are 373.38 mm high, 150.88 mm wide, and 167.89 mm deep (14.7 in × 5.94 in × 6.61 in), with a tightening torque range of 4.4–50 N·m (38.9–442.5 in-lb). It is UL 489 listed and carries certifications from CSA, NEMA, IEC, CE, NMX, VDE, BS, and CCC. This LJA34400WU31X unit is designed as a main panel disconnect or distribution protection device in power systems, such as data centers or industrial control panels, combining robust protection with modular accessories across the PowerPact L range.