Schneider Electric 9999SX12 Electrical Interlock

Schneider Electric's Square D 9999SX12 is an internal, nonconvertible auxiliary contact kit for Type S NEMA motor starters and contactors, providing one normally closed (1 NC) contact. This accessory is designed to function as part of the electrical interlock on reversing contactors and starters, helping ensure safe interlocking in forward/reverse motor circuits. The 9999SX12 is rated for up to 600 V AC and 3 A for the NC contact, delivering a compact interlock solution within the Square D 9999 interlock family. Typical applications include interlock circuits in motor control panels and reversing starters where a dedicated NC interlock contact integrated with Type S devices is required.