A differential pressure switch is a device that monitors the difference in pressure between two points in a system. It is commonly used in various applications, such as HVAC systems, to ensure proper airflow and prevent equipment damage. When the pressure difference reaches a predetermined level, the switch activates or deactivates a connected device, like a fan or pump. These switches are essential for maintaining safety and efficiency in systems that rely on pressure regulation. They can be found in industries ranging from manufacturing to water treatment, helping to optimize performance and protect equipment from potential failures.