The ABB ACH180-04S-03A7-2 Variable Frequency Drive is a compact HVAC motor controller designed to regulate the speed and operation of three-phase AC motors. It varies motor frequency and voltage to provide precise, energy-efficient speed control. This drive is used with HVAC equipment such as air-handling units, fans, pumps, heat pumps, and chillers. https://www.partshnc.com/abb-ach180-04s-03a7-2-variable-frequency-drive-3-5-amp-240v-3ph-type-op