Sylvania QSF2053 Fusible Panelboard Disconnect Switch

The Sylvania QSF2053 is a 200A, 600V fusible panelboard disconnect switch designed for three‑phase panelboard applications, providing a dedicated main disconnect with replaceable fuse links integrated into the distribution path. This 3‑pole device is intended for installation in standard distribution panel enclosures to safely isolate circuits or equipment for servicing, testing, or maintenance, with line and load terminals configured for common panelboard architectures and secure conductor termination in the field. In commercial and light industrial power distribution, the QSF2053 supports full load current on 3‑phase systems while ensuring all three phases can be disconnected together, a common requirement for fusible panelboard protection upstream of downstream devices, and these switches are frequently used as main disconnects in new installations or panelboard upgrades. Variants in the QSF2053 family include QSF2053R and QSF2053C; some listings note mounting kit options to accommodate different panelboard footprints and installation preferences.