BELIMO NFA-S2

The BELIMO NFA‑S2 actuator is designed to bring safety, reliability, and ease of operation to ventilation, HVAC and valve/damper control systems. Its 10 Nm torque is sufficient for most dampers up to ~2 m² or for small-to-medium valves, making it well suited for air distribution dampers, zone dampers, fire dampers, or mixing valves in residential, commercial or light‑industrial installations. hvac.co.th+2HVACPA+2

One of the main advantages of the NFA‑S2 is its spring‑return “fail‑safe” feature: if power is lost — for instance during a blackout or emergency — the actuator automatically returns the damper or valve to a safe position, preventing uncontrolled airflow or fluid flow. belimo.dk+2belimo-sklep.pl+2

The actuator is built for ease and flexibility: it accepts a wide supply voltage (AC 24–240 V or DC 24–125 V), and mounts directly on damper or valve shafts using a universal shaft clamp (10–25.4 mm) with anti‑rotation strap, making installation quick and straightforward. belimo-sklep.pl+1

For building automation or safety systems, the two integrated SPDT auxiliary switches provide feedback (e.g. damper/valve open or closed), enabling signalling or interlock functions. Scribd+1

Maintenance is minimal: the actuator is service‑free, housed in a durable IP54 enclosure suitable for typical HVAC indoor environments, and includes manual override (hand‑crank with locking switch) for manual control or commissioning. HVACPA+1

Compared to basic on/off actuators or manual dampers, NFA‑S2 delivers a safer, more reliable, automation‑ready, maintenance‑free solution — ideal for ventilation, fire-safety dampers, zone control, or any application where fail‑safe positioning and consistent control are critical.