Belimo SRFA-5-O - fail-safe rotary actuator

Belimo SRFA-5-O – rotary actuator for valves

The fail-safe actuator is designed for ball valves and butterfly valves. During operation, it moves the valve to its operating position and tensions the return spring. If the power supply is interrupted, the spring moves the valve to its safety position: open (NO).

Key features and technical data

• Motor torque and fail-safe torque: 20 Nm.
• Control: Close/Open; rated voltage: AC 24...240 V / DC 24...125 V; frequency: 50/60 Hz.
• Motor running time: 75 s / 90°; fail-safe repositioning time: <20 s @ -20...50°C, <60 s @ -30°C.
• Power consumption during operation: 7 W; at rest: 3.5 W; sizing power for cable selection: 18 VA.
• Power and control cable: 1 m, 2x 0.75 mm².
• Manual adjustment by crank and position locking by switch; mechanical position indicator and rotation angle adjustment using mechanical stops.
• Connection flange: F05; protection rating: IP54.
• Ambient temperature: -30...50°C; parallel operation: yes, subject to operating data.

The open position after power failure applies to direction A – AB = 100%; for valves with an L-port, the data sheet specifies A – AB = 0%.