Schneider Electric QMB366W Panelboard Switch

Schneider Electric's QMB366W Panelboard Switch is a 3-pole fusible switch unit designed for QMB fusible panelboards, delivering 600 A at up to 600 V AC with a 500 HP maximum at 600 VAC. The 15-inch-tall switch provides integrated overcurrent protection and serves as a disconnect between source and load, UL and CSA listed for safety compliance. It accepts Class H or Class K fuses, and Class R fuses can be used with the QMB4060R kit; fuse ratings span 401 A to 600 A. Mechanical aluminum lugs come standard, with options for aluminum or copper crimp lugs to fit different conductor terminations. This unit is part of Square D’s QMB family and is intended for installations in medium- to large-panelboard applications that require a fusible disconnect for feeders or main protection. End-of-commercialization for the QMB366W was announced with a discontinue date of May 5, 2025, after which new sales were limited while after-sales service and spare parts remain available to support existing installations.