Square D QMB321TW Fusible Panelboard Switch 30A 240V

Square D QMB321TW is a fusible panelboard switch unit from the QMB series, designed for 240 V AC operation and rated at 30 A. This three-pole, fusible disconnect is described as a Twin Branch Switch Unit, intended for use inside Square D QMB fusible panelboards to provide manual isolation and feeder protection for branch circuits. The QMB321TW features a 7-1/2 hp power rating at 240 V and a short-circuit current rating up to 200 kA, enabling reliable operation in moderate-load installations while remaining compact. As part of Square D by Schneider Electric, this unit is commonly installed in commercial and light-industrial electrical distributions as a dedicated fuse disconnect, either as a standalone switch or integrated with other QMB components. Its part number uniquely identifies a 3-pole, 30 A, 240 V fusible switch unit within the QMB lineup, and it is widely stocked by electrical distributors for easy replacement in existing panelboard installations. Designed for installations where a fused disconnect is needed, the QMB321TW works with other QMB devices to enable safe isolation during service or maintenance.