The Honeywell C6097B3028 is a pressure switch designed for safety and efficiency in a variety of HVAC applications. It monitors gas or air pressure between one and twenty pounds per square inch (psi), acting as a safety shutdown. When pressure reaches a predetermined limit, the "breakonrise" device cuts the electrical circuit to prevent harm to the equipment. https://www.partshnc.com/3-21breakonrise-mr-14npt-2