Square D 9001KU18 Protective Cap for Selector Switch

Square D Harmony 9001KU18 is a 30 mm protective boot for Type K selector switches, provided as a clear rubber cap with a gloved-hand cap option for long-hand standard knob selectors. It is designed for use with 9001 long-hand selector switches, and its transparent profile lets you see the knob position while the boot shields the actuator from dust, debris, and moisture in harsh environments. The 9001KU18 accessory, cataloged under the Square D 9001 family, is part of Schneider Electric’s KU protective boot lineup and is commonly listed alongside other color codes and cap configurations (KU1–KU8, KU17, KU27, KU37, KU47) to accommodate different operator needs. Ideal for control panels and industrial equipment that use 30 mm Square D switches, this boot is designed for use in dirty or washdown environments and features a clear, unobtrusive appearance that keeps the underlying knob visible. The gloved-hand cap variant provided by KU18 supports safer, more comfortable operation when operators wear gloves.