Schneider Electric Q432400 I-Line Circuit Breaker

The Schneider Electric Square D Q432400 is a Q4-frame, 400‑amp, 3‑pole molded‑case circuit breaker designed for 240‑volt I‑Line panelboard installations, delivering compact, high‑current protection for mid‑to‑large distribution circuits in commercial and industrial electrical systems and serving as a hard‑wearing safeguard for main service feeders and downstream branches. It provides thermal‑magnetic protection with a 25 kA interrupting rating at 240 VAC, allowing reliable interruption of fault currents and overloads while maintaining safe, code‑compliant operation in feeders and branch circuits across normal and abnormal operating conditions. As part of the I‑Line family, the Q432400 is designed to integrate with Square D I‑Line panel infrastructure, supporting the required 400 A current path and three‑phase protection for networks using 240 V service, and aligning with common industrial distribution architectures. This unit serves as a dedicated replacement or upgrade option for systems requiring a robust Q4‑class breaker with 400 A rating, 3 poles, and I‑Line compatibility, empowering technicians to upgrade feeders or add capacity while preserving protection coordination and system reliability.