Square D LAP36300MB BU Three Phase Circuit Breaker

Square D LAP36300MB BU Three-Phase Molded Case Circuit Breaker is a 300 A, 600 V maximum MCCB from Square D's PowerPact lineup, designed to protect three-phase feeders in commercial and industrial panels. The LAP36300MB BU model is a three-pole (3P) device with I-Line mounting, intended for use in compatible Square D panelboards and switchgear. It carries a short-circuit current rating of 30 kA at 600 V, enabling rapid interruption of high-energy faults while maintaining dependable protection for downstream equipment. The molded-case construction provides robust enclosure and standardized trip characteristics that support straightforward replacement in existing PowerPact systems. Applications include main or feeder protection for 3-phase circuits in 600 V distribution networks, motor control centers, and industrial panel assemblies where a single device must trip all three phases simultaneously. The LAP36300MB BU designation identifies the exact form factor and mounting style within the LAP family, helping ensure compatibility with the corresponding bus and accessory ecosystem from Square D. Widely carried by electrical distributors and integrators, this part is a common choice when upgrading legacy equipment or stocking spare MCCBs for PowerPact installations, offering a direct path to drop-in replacement in many 3P, 600 V applications.