United Electric J21K-150 SPDT Differential Pressure Switch 0-40 PSI NEMA 4

The United Electric J21K-150 SPDT Differential Pressure Switch is used to measure and regulate differential pressure in the range of 0-40 PSI. It is housed in a NEMA 4 enclosure that is weather resistant and is suitable for use in typical HVAC conditions. This turns on or off circuits depending on the set differential pressure limits to maintain the efficiency and safety of the system. It widely applied in HVAC systems like air handlers, filters, and pumps and can notify about the clogged filters or the absence of airflow. Some of the benefits that are associated with the use of the system include increased energy efficiency, increased safety of the equipment.