Belimo SFU-S2 Damper Actuator Open Close 2-Position

Belimo SFU-S2 damper actuator provides two-position open/close control for HVAC dampers, delivering 20 Nm of torque to move dampers reliably in response to control signals. It supports a wide power range—AC 24–240 V or DC 24–125 V—with 50/60 Hz operation to fit a variety of building automation systems, and includes two auxiliary switches for additional signaling tied to damper position. Two-position operation means the damper is either fully open or fully closed, enabling rapid, decisive movement in response to simple open/close commands. The SFU-S2 is listed by Belimo as the predecessor to the current SFA-S2, which catalogs show as the replacement model, reflecting the company’s evolution of two-position dampers actuators. Common applications include air damper control in commercial and light-industrial HVAC installations where straightforward two-position actuation and robust torque are required.