Belimo NRF24A-S2-O - rotary actuator for ball valves

Belimo NRF24A-S2-O actuator

Rotary actuator for ball valves. The return spring is tensioned during operation; if the power supply fails, it moves the valve to the NO safety position (valve open, A–AB = 100%).

Key features and specifications

• Motor and safety function torque: 10 Nm.
• Nominal voltage: AC/DC 24 V; nominal voltage frequency: 50/60 Hz.
• Nominal voltage range: AC 19.2...28.8 V / DC 21.6...28.8 V.
• Control: Close/Open.
• Motor running time: 75 s / 90°; safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Power consumption during operation: 6 W; at rest: 2.5 W; for wire sizing: 8.5 VA.
• Auxiliary switches: 2x SPDT, 1x 10% / 1x 11...100%.
• Power and control connection: 1 m cable, 2x 0.75 mm²; auxiliary switch connection: 1 m cable, 6x 0.75 mm².
• Mechanical position indicator and adjustable rotation angle with mechanical stops.
• Manual operation using a crank and locking switch.
• Protection rating: IP54; NEMA 2; UL Enclosure Type 2 housing.
• Ambient temperature: -30...50°C.

Direct mounting on the ball valve using one screw. The mounting position relative to the valve can be selected in 90° increments.