Belimo SRF24A-SZ-5 - rotary actuator with spring return

Belimo SRF24A-SZ-5

Rotary actuator with spring return, designed for ball valves and butterfly valves. The Y control signal moves the valve to its operating position while tensioning the spring. When the power supply is interrupted, the spring moves the valve to the NC safety position (valve closed, A – AB = 0%).

Key features

• Motor and spring return torque: 20 Nm.
• Rated voltage: AC/DC 24 V; AC voltage frequency: 50/60 Hz.
• Y control range: 0.5...10 V; U position feedback: 0.5...10 V.
• Motor running time: 90 s / 90°; spring return time: <20 s @ -20...50°C, <60 s @ -30°C.
• Power and control connection: 1 m cable, 4x 0.75 mm².
• F05 flange mounting; orientation relative to the valve can be selected in 90° increments.
• Manual operation with a crank and locking switch; adjustable rotation angle using mechanical stops.
• IP54 protection rating; ambient temperature -30...50°C.

Electrical data

• Power consumption during operation: 5.5 W; in standby position: 3 W.
• Power rating for cable sizing: 8.5 VA.
• Voltage range: AC 19.2...28.8 V / DC 21.6...28.8 V.
• Positioning accuracy: ±5%.