Square D LJA36400CU54XEBABBEYD Circuit Breaker

Square D LJA36400CU54XEBABBEYD is a three-pole molded-case circuit breaker (MCCB) rated for 400 A at up to 600 V AC, a high-current device in Square D's PowerPact LJA family that supplies robust overcurrent protection for feeders, panelboards, and distribution gear in commercial and light industrial environments. It uses an electronic MicroLOGIC trip unit to deliver precise protection—combining thermal-magnetic sensing with microprocessor-based coordination to improve selectivity and reduce nuisance trips across complex wiring schemes. The CU suffix denotes copper-terminal construction, and this unit shares the standard L-frame footprint common to PowerPact MCCBs, allowing it to drop into compatible enclosures and bus systems with minimal modification; it's designed for copper or aluminum conductors in many configurations. Because it is a 600 V class MCCB, it is commonly employed to safeguard large feeders and critical circuits in commercial facilities and light industrial processes, providing reliable interruption performance at 600 V and compatibility with common wire sizes. Overall, LJA36400CU54XEBABBEYD is intended for applications where dependable protection of high-current circuits at 600 V is essential, and where the combination of an electronic trip unit and a heavy-duty MCCB form factor supports safer, more maintainable power distribution.