The Hubbell Industrial Controls 69HA1 Pressure Switch is an adjustable pressure control designed for HVAC and refrigeration systems. It monitors system pressure and automatically opens or closes an electrical circuit when pressure reaches the selected setting. With a 40–250 PSI pressure range and 30–60 PSI differential, it helps regulate compressor operation and maintain proper system... https://www.partshnc.com/69ha1-hubbell-industrial-controls-press-switch-40-250-30-60-dif