The Siemens Industrial Controls 3TX7112-1DF13C 8-Pin DPDT Octal Relay is an electromechanical switching device rated at 16A with a 120V coil, designed for reliable circuit control in HVAC systems. It operates by energizing an internal coil to switch double-pole double-throw contacts, enabling precise control of multiple electrical circuits. https://www.partshnc.com/16a-120v-8pin-dpdt-octal-relay