Schneider Electric LJA36400U44X Circuit Breaker

Schneider Electric's Square D PowerPact L-frame LJA36400U44X molded-case circuit breaker delivers 400 A of protection for three-phase systems up to 600 V AC. This I-Line plug-in breaker houses a Micrologic 6.3 A electronic trip unit (LSIG), providing Long-Time, Short-Time, Instantaneous, and Ground-Fault protection for precise fault clearance in demanding industrial environments. With a UL-listed interrupting capacity of up to 65 kA at 480 V and compatibility with PowerPact L-series panels, the LJA36400U44X is built for reliability in feeders and motor circuits and can be used for 2P applications where permitted by the installation. The rugged molded-case construction, combined with the LSIG electronic trip, supports straightforward field installation and clear trip indication, making it suitable for industrial power distribution in manufacturing facilities and data centers where robust protection and dependable operation are essential. Its I-Line bus connection and compatibility with other LSIG trip units and PowerPact L-frame accessories enable scalable protection across larger distribution schemes, helping maintain system continuity while simplifying panel layout and maintenance.