Square D QMB323TW is a panel-mounted fusible safety switch designed for providing reliable circuit protection and isolation in industrial three-phase power distribution systems. It features a 240V AC voltage rating and a 100A current rating, housed in a robust NEMA Type 1 enclosure with dimensions of 229 mm H x 112.78 mm W x 78.49 mm D and a weight of 23.001 lb. The switch is certified to NEMA KS1 standards and offers a high 200kA interrupting capacity at 240V, making it suitable for demanding applications such as motor control centers, industrial machinery, and main service disconnects where robust protection is required.