Schneider Electric SD-3203 Fusible Disconnect Switch

Schneider Electric's Square D SD-3203 fusible bus plug is a 30 A, 240 V, three-pole, three-wire fusible disconnect unit designed for inline use with Square D busway systems. This QMB Saflex plug-in model installs into compatible bus duct sections to provide protected, easily removable feeder protection for 240 V circuits up to 30 A, and it accepts standard fuse carriers for fusible protection. Depending on the carrier variant, it can accommodate Class H, K, or R fuses and delivers a short-circuit rating up to 200 kA at 240 V, making it suitable for industrial and commercial distribution where modular, plug-in protection within a busway is required. The SD-3203 is intended for use with I-Line busway systems and is often cataloged in literature as PQ3203 (and related parts PQ3203J/PQ3203R), reflecting catalog migrations rather than functional differences.