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

Belimo SRF24A-SR-S2-5-O

Analogue rotary actuator with safety function, designed for ball valves and butterfly valves. During operation, it moves the valve to the operating position and tensions the return spring. In the event of a power failure, the spring moves the valve to the NO safe position—open (A–AB = 100%).

Key features and technical data

• Motor and safety function torque: 20 Nm.
• Rated voltage: AC/DC 24 V; operating range: AC 19.2...28.8 V / DC 21.6...28.8 V.
• Operating range Y: 2...10 V; feedback signal U: 2...10 V.
• Motor running time: 90 s / 90°; safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Two built-in auxiliary switches: 2x SPDT, 1x 10% / 1x 11...100%.
• Power consumption: 4.5 W during operation and 1.5 W at rest; rated power: 6.5 VA.
• F05 flange connection; enclosure protection category IP54.
• Manual adjustment with a crank and position locking with a locking switch; mechanical position indicator.
• Power / control connection: Cable 1 m, 4x 0.75 mm²; auxiliary switch connection: Cable 1 m, 6x 0.75 mm².

The device is intended for stationary heating, ventilation and air-conditioning systems. For valves with an “L”-shaped port, the data sheet specifies different information on the safety function direction of movement: A–AB = 0%.