Belimo SRFA-R - rotary actuator with spring return

Belimo SRFA-R – RetroFIT+ rotary actuator

Actuator for rotary valves and dampers. When power is applied, it moves the valve to the operating position and tensions the return spring. When power is interrupted, the spring moves the valve to the selected fail-safe position.

Key features and technical data

• Motor and fail-safe function torque: 20 Nm.
• Nominal voltage: AC 24...240 V / DC 24...125 V; frequency: 50/60 Hz.
• Control: Open/Close.
• Motor running time: 75 s / 90°; fail-safe function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Selectable direction of action on power failure: NC, valve closed (A – AB = 0%) or NO, valve open (A – AB = 100%).
• Power consumption during operation: 7 W; at rest: 3 W; sizing power: 18 VA.
• Power and control connection: 1 m cable, 2x 0.75 mm².
• F03/F04/F05 connection flange; adjustable rotation angle with mechanical end stops and mechanical position indicator.
• Manual adjustment using a crank and locking switch.
• Degree of protection IP54; NEMA 2; UL Enclosure Type 2.

For mounting on rotary valves and dampers with an ISO 5211 flange: F03, F04, F05 and compatible stem geometry. The stem-matching adapter is not included with the product.