Schneider Electric (Square D) 9999SX8 Auxiliary Contact Kit 1NO/1NC

The Schneider Electric (Square D) 9999SX8 Auxiliary Contact Kit is an electrical accessory that adds supplementary switching capability to contactors and starters, enabling additional control signaling within HVAC systems. It operates with a 1 normally open and 1 normally closed contact configuration, rated up to 600 VAC and 10 amps, allowing it to open or close auxiliary circuits in response to the main component operation. Installed externally on compatible NEMA Size 007 contactors or starters, it integrates into control panels where expanded circuit control is required. Its use supports improved system coordination and helps maintain reliable control performance.