Cleveland Controls RFS-4100-040 Adjustable Pressure Switch 0.15-5" WC

The Cleveland Controls RFS-4100-040 Adjustable Pressure Switch for HVAC systems. It is designed for use in low-pressure systems and has a pressure range of 0.15 to 5-inches WC. This switch is both a safety and control element that measures the system pressure and initiates actions depending on the set pressure levels. When the system pressure rises above the upper setpoint, the switch closes a normally open contact to respond to the situation such as stopping a fan or sounding an alarm. When pressure goes below the lower set point, the switch opens a normally closed contact which may be used to start up equipment or perform other functions as required.