Square D By Schneider Electric A1B-320 Circuit Breaker

Square D by Schneider Electric A1B-320 is a molded‑case circuit breaker engineered for three‑phase, 240 V systems, delivering 20 A of protection in a 3‑pole configuration with bolt‑on mounting. Built from the A1B family, the A1B320 model provides a 10 kA interrupting capacity at 240 V and employs a thermal‑magnetic trip mechanism to guard against both overloads and short circuits. It supports Long‑Time and Instantaneous (LI) trip functions, enabling selective protection for downstream feeders within compatible Square D panels that accept A1B‑type breakers. This device is designed for use in commercial or light industrial distribution where reliable 3‑phase protection at 240 V is required, and its bolt‑on mounting facilitates secure installation in appropriate panelEnclosures. While A1B series breakers are largely considered obsolete in many markets, distributors still stock new or refurbished units to support legacy equipment and existing installations that rely on this legacy format.