Schneider Electric 999TC11 Electrical Interlock Auxiliary Contact Kit

Schneider Electric's 999TC11 Electrical Interlock Auxiliary Contact Kit is a dedicated accessory for Square D disconnect switches, providing an electrical interlock between the main disconnect and the control circuit. Used on disconnect equipment to disconnect separately supplied control power when the main disconnect is OFF, the interlock helps prevent backfeed and supports safe lockout of the control circuit. As part of the Square D interlock family, this kit enables coordinated operation of main and control circuits in motor control and power-distribution assemblies, and is designed for installation by qualified personnel in accordance with applicable electrical codes and standards.