Schneider Electric 9999SX8 U Selector Switch Unit

Schneider Electric 9999SX8 U is a field-convertible auxiliary contact kit for NEMA Type S motor starters and contactors in Size 00–7, providing one normally open and one normally closed isolated contact that can be mounted externally to the starter. It enables control signaling or interlock circuits without altering the main contacts, and is rated up to 600 V AC and 10 A for reliable auxiliary signaling in industrial control systems. Designed to accompany Schneider Electric’s Size 00–7 Type S starters, this kit installs in the field and can be wired into the control circuit as needed, adding flexible, external auxiliary functionality to existing Square D starter assemblies.