Description
The Schneider Electric (Square D) 9999D01 Contactor Auxiliary Contact Kit is an add-on switching part that provides one normally closed auxiliary contact for monitoring or interlocking operations in electrical control circuits. It operates through a mechanical linkage with a primary contactor, changing state in coordination with the main contact movement to transmit control signals or feedback status. Used in motor control panels, starter assemblies, and HVAC systems of compressors, pumps, and fan circuits, it enables circuit indication, interlock logic, and status signaling within electrical control arrangements.
