Belimo SRFA-S2-5-O - rotary actuator for valves

Belimo SRFA-S2-5-O rotary actuator

The SRFA-S2-5-O model is designed for ball valves and butterfly valves. During operation, it tensions the return spring; if the power supply is interrupted, the spring moves the valve to the NO safety position, i.e. open (A–AB = 100%). For valves with an L-port, the documentation specifies A–AB = 0%.

Key features and parameters

• Motor and safety function torque: 20 Nm.
• Nominal voltage: AC 24...240 V / DC 24...125 V; nominal voltage frequency: 50/60 Hz.
• Close/Open control; motor running time: 75 s / 90°.
• Safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• 2x SPDT: one switch set to 10%, the other adjustable within 11...100%.
• Power consumption: 7 W during movement, 3.5 W at rest; sizing power for cables: 18 VA.
• Manual operation by crank with locking switch; rotation angle adjustment using mechanical stops and a mechanical position indicator.
• F05 connection flange; IP54 protection rating.
• Power and control connection: Cable 1 m, 2x 0.75 mm²; auxiliary switch connection: Cable 1 m, 6x 0.75 mm².