Belimo SRF24A-SR-S2 - rotary actuator for ball valves

Belimo SRF24A-SR-S2

Rotary actuator with spring-return fail-safe function for ball valves. When the power supply is interrupted, the spring moves the valve to its safety position: closed without power (NC). The device is intended for stationary heating, ventilation and air conditioning installations.

Key features and technical data

• Motor and fail-safe function torque: 20 Nm.
• Rated voltage: AC/DC 24 V; frequency: 50/60 Hz.
• Modulating control: 2...10 V; 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.
• Two integrated auxiliary switches: 2x SPDT, 1x 10% / 1x 11...100%.
• Power consumption during operation: 5.5 W; in idle position: 3 W; for wire 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.
• IEC/EN protection rating: IP54; ambient temperature range: -30...50°C.
• Manual operation using a crank and locking switch, mechanical position indicator, and rotation angle adjustment using mechanical stops.

Direct mounting on the ball valve is performed with one screw; mounting orientation can be selected in 90° increments.