Belimo NF24A - rotary actuator for dampers with safety function

Belimo NF24A – actuator for dampers

Rotary actuator with a safety function, designed to control dampers in technical building systems. During operation, the actuator moves the damper and tensions the return spring. If the power supply is interrupted, the spring moves it to the safety position.

Key features and specifications

• Motor and safety function torque: 10 Nm.
• Rated voltage: AC/DC 24 V; frequency: 50/60 Hz.
• Control: Close/Open.
• Motor running time: 75 s / 90°; safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Rotation angle: max. 95°; adjustment with mechanical end stops.
• Motor and safety function direction of movement selected by L/R mounting.
• Manual override using a crank and locking switch; mechanical position indication.
• Universal clamp for shafts 10...25.4 mm.
• Power consumption: 6 W during movement, 2.5 W at rest; 8.5 VA for wire sizing.
• Power and control connection: 1 m cable, 2x 0.75 mm².
• Degree of protection: IP54; ambient temperature: -30...50°C [-22...122°F].

The actuator has overload protection and stops automatically when it reaches an end stop. Direct mounting on the damper shaft is via the universal clamp and an anti-rotation mechanism.