The Siemens Industrial Controls 3RT2026-1AC20 3-Pole Contactor (25 A, 24 V) is a heavy-duty electromechanical switching device designed for controlling high-current loads in HVAC systems. When its 24 V coil is energized, the three poles close simultaneously to deliver power to compressors, fans, or pumps. https://www.partshnc.com/24v-25amp-3p-contactor