Square D PJA36040CU43A U Molded Case Circuit Breaker

Square D PJA36040CU43A U Molded Case Circuit Breaker is a 400‑amp, 600‑volt three‑pole protection device in Square D’s PJA frame designed for feeders and power distribution panels in industrial settings. The CU43A variant denotes the Type 49 MicroLogic trip unit family, offering adjustable protection coordination suited for downstream devices while providing clear fault indication in panel installations. At 600 VAC, this breaker delivers up to a 25 kA interrupting rating, enabling safe interruption of high‑energy faults in commercial and heavy industrial systems. Constructed as a molded‑case breaker, it is intended for use in switchgear, panelboards, and power distribution assemblies where reliable overcurrent protection and diagnostics are required. The PJA series is noted for its high current ratings within a compact footprint, making it appropriate for large feeders or motor circuits in demanding environments.