Schneider Electric 9999SX6 Electrical Interlock

Schneider Electric's Square D 9999SX6 is a field-convertible external auxiliary contact kit for NEMA Type S motor starters, delivering a single normally open contact that mounts on the starter. Rated for up to 600 V AC and 10 A, the 9999SX6 provides signaling and interlock capabilities in control circuits and is designed as an external auxiliary contact with Type S contactors or starters (NEMA Size 5). Schneider Electric (Square D) lists 9999SX6 as the 1 NO auxiliary contact kit, with related parts 9999SX7 for 1 NC and 9999SX8 for 1 NO and 1 NC, enabling field configurability to suit different control requirements.