The Hubbell Industrial Controls 69HAU3 Switch15Ci/50Co, 30-40 Set, 7-15 is an essential component of HVAC systems, designed to keep temperature and pressure within prescribed limits. This switch works by measuring the pressure and temperature and then turning on or off the associated equipment based on those readings. It is frequently used in HVAC systems for equipment like industrial... https://www.partshnc.com/69hau3-hubbell-industrial-controls-switch15ci50co30-40set7-15