Square D EJB34050 Molded Case Circuit Breaker

Square D by Schneider Electric EJB34050 is a 50 A, 3‑pole molded‑case circuit breaker in the EJB (E‑Frame) family, designed to protect three‑phase feeders in commercial and industrial power distribution. Rated for 480Y/277 VAC systems, it provides overload and short‑circuit protection with a thermal‑magnetic trip that combines long‑time and instantaneous functions; bolt‑on mounting with copper lugs supports panel integration. The device is UL Listed and CSA Certified, with an interrupting rating of 65 kA at 480 V. Lug options include Cu wires #14–6 AWG or Al wires #12–6 AWG, depending on the installation. This model is commonly used to protect feeders to motors, transformers, and other control circuits in distribution panels and MCCs, where a 50 A, three‑phase protection is required for moderate‑to‑heavy loads in 480Y/277 VAC systems.