ACI product ACI product Automation Components, LLC. (ACI) a DwyerOmega brand, is a high-quality manufacturer and distributor of environmental sensors for the Heating, Ventilation and Air Conditioning (HVAC) Industry. ECMCS25-A ECMSplit Core, N/O ECM Current Switch, Current Sensing Range: 0–25 A, Trip Adjustment Range: 0.075–0.5 A A/DIFF-ENT RH EnthalpyEnthalpy, Differential Enthalpy Changeover Control, Indoor vs Outdoor, 24 VAC Form 1C Relay Contact Contact for a Quote