The Schneider Electric Square D 9999SX8 is an auxiliary contact accessory designed for NEMA motor starters and contactors in the Type S family. It provides one normally open (NO) and one normally closed (NC) isolated contact, mounted externally and field-convertible for flexible integration with 9999-series devices. Rated for 10 A, this external auxiliary contact adds signaling and interlock feedback to control circuits, supporting safety interlock configurations and automation sequences in industrial panels.
