Manufacturer Name: Schneider Electric (Square D) Product Number: 9999SC2 OEM Part Number: 9999SC2 The Schneider Electric Square D 9999SC2 Hand/Off/Auto Selector Switch is a multifunctional control device used to manage HVAC systems. Users can manually choose between the Hand, Off, and Auto operating modes with this switch. While the Auto mode allows the system to operate automati... https://www.partshnc.com/9999sc2-schneider-electric-square-d-handoffauto-selector-switch