What type of switch indicates a fully actuated damper position?

What type of switch indicates a fully actuated damper position?

• A. End switch
• B. Limit switch
• C. Pressure switch
• D. Flow switch

Answer: (A)

The main idea is feedback on the damper’s travel to confirm it has finished moving. An end switch is a switch placed at the end of the damper’s travel and is energized when the blade reaches its fully open or fully closed position. This provides a definitive signal to the control system that the damper is fully actuated, allowing the controller to stop the actuator or switch to the next control state without guessing or overshooting. A limit switch is a broader term for a device that signals position, but in damper applications the end switch specifically serves as the end-of-travel indicator for fully actuated dampers. Pressure and flow switches monitor air pressure or airflow, not the damper blade position, so they don’t indicate whether the damper is fully actuated.

The main idea is feedback on the damper’s travel to confirm it has finished moving. An end switch is a switch placed at the end of the damper’s travel and is energized when the blade reaches its fully open or fully closed position. This provides a definitive signal to the control system that the damper is fully actuated, allowing the controller to stop the actuator or switch to the next control state without guessing or overshooting.

A limit switch is a broader term for a device that signals position, but in damper applications the end switch specifically serves as the end-of-travel indicator for fully actuated dampers. Pressure and flow switches monitor air pressure or airflow, not the damper blade position, so they don’t indicate whether the damper is fully actuated.