Square D MJA36400 Molded Case Circuit Breaker

PowerPact MJA36400 Molded Case Circuit Breaker from Square D (Schneider Electric) is a 400 A, three-pole device designed for 600 V AC systems. As part of the PowerPact M family, the MJA36400 uses an electronic trip unit for long-time and instantaneous protection and carries a 25 kA interrupting rating at 600 V. The unit features I-Line plug-on mounting with load-lug terminals and accepts conductors up to 3/0 AWG to 500 kcmil, enabling flexible, high-capacity wiring in industrial panels. This 3P, 600 V MCCB is commonly used to protect feeders and large motors in commercial and industrial distribution equipment, including panelboards and switchgear, delivering reliable protection for upstream equipment while matching standard PowerPact M enclosures. Designed for use in demanding electrical installations, it supports standard three-phase distribution and provides coordinated protection for power circuits in harsh environments where robust fault-current interruption is required. Industry catalogs and distributors list the MJA36400 for 3P 600 V systems, reflecting its role in large-scale installations.