This 350°F high limit switch acts as a primary safety control

or moisture penetration in the sensor bulb

Common Questions: Can this switch replace a manual reset limit

maintaining original equipment specifications and performance curves

Can I use a higher temperature limit if this one keeps opening

Cleveland Controls DFS-448-153 Switch This 350°F high limit switchThe Cleveland Controls DFS 448 153 is a purpose built air flow switch designed for critical monitoring in industrial HVAC systems, air handling units, and duct heaters. This fixed set point air pressure switch is factory calibrated to actuate on a pressure rise of 0. 05" 0. 02" w. c., providing high accuracy sensing for equipment safety and cycle control. Featuring a SPDT switch configuration (Single Pole Double Throw), it facilitates versatile wiring