Belimo SFA - rotary actuator for dampers with safety function

Belimo SFA – actuator for air dampers

Rotary actuator with a safety function for positioning dampers in technical building systems. During operation, the actuator positions the damper and tensions the return spring; if the power supply is interrupted, the spring moves it to the safety position. According to the technical data sheet, it is intended for air dampers with an area of up to approx. 4 m².

Key technical data

• Torque of the motor and safety function: 20 Nm.
• Rated voltage: AC 24...240 V / DC 24...125 V; rated voltage frequency: 50/60 Hz.
• Control: Open/Close.
• Motor running time: 75 s / 90°; safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Angle of rotation: max. 95°, adjustable using mechanical stops.
• Mechanical connection: universal clamp 10...25.4 mm; motor and safety function direction of movement selected by L/R mounting.
• Manual override using a crank and locking switch; mechanical position indicator.
• Power consumption during operation: 7 W; at rest: 3.5 W; sizing power for cable selection: 18 VA.
• Power and control connection: cable 1 m, 2x 0.75 mm².
• Degree of protection: IP54; ambient temperature: -30...50°C [-22...122°F].