Schneider Electric 9999SX8 Auxiliary Contact Kit Brand: Schneider Electric. Part Number: 9999SX8. Square D Auxiliary Contact Kit, Field Convertible, 600 VAC, 10 A, 1NO-1NC Contacts, Threaded Mount, For Use with: Class 9999 Type SA-SJ NEMA 00 to 7 Contactor and Starter. Additional Description: SQD -9999SX8 CONTACTOR+STARTER AUXILIARY CONTACT KIT 1NO/1NC CONVERTABLE. Catalog Description: NEMA Motor Starter and contactor, Type S, auxiliary contact, 1 NO/1 NC isolated contact, external, field convertible..