Belimo SRF24A-SR-S2-5 - rotary actuator with spring return

Belimo SRF24A-SR-S2-5

Rotary actuator for ball valves and butterfly valves, controlled by an analogue Y signal. During operation, the actuator positions the valve and tensions the return spring. If the power supply is interrupted, the spring moves the valve to the NC fail-safe position.

Key features and specifications

• Motor and fail-safe function torque: 20 Nm.
• Rated voltage: AC/DC 24 V; rated voltage frequency: 50/60 Hz.
• Y operating range: 2...10 V; U position feedback signal: 2...10 V.
• Motor running time: 90 s / 90°; fail-safe function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• On power failure: NC, valve closed (A–AB = 0%); for valves with L-port: A–AB = 100%.
• Auxiliary switches: 2x SPDT, 1x 10% / 1x 11...100%.
• Power consumption during operation: 5.5 W; at rest: 3 W; for cable sizing: 8.5 VA.
• Power and control connection: 1 m cable, 4x 0.75 mm²; auxiliary switch connection: 1 m cable, 6x 0.75 mm².
• Mounting flange: F05; degree of protection: IP54.
• Manual positioning with a crank and locking switch; mechanically adjustable rotation angle and mechanical position indicator.