The Belimo NM24A-SR is a modulating 10 Nm damper actuator controlled by a 2–10 V signal, with 2–10 V position feedback for the BMS. Rather than simply opening or closing, it drives the damper to any position proportional to the control signal — essential for accurate air volume control, mixing dampers and modulating fresh-air applications. It handles dampers up to approximately 2 m², runs on AC/DC 24 V at a quiet 35 dB(A), and offers ±5% positioning accuracy with a lockable manual override. Direct shaft mounting (8–26.7 mm clamp) makes installation simple. Choose this model when your controller provides a 0–10 V / 2–10 V modulating output; if you only need open/close, the NM24A is more economical. Confirm damper torque, shaft size and that your BMS output is genuinely modulating before ordering.
| Spec | Detail |
|---|---|
| Model | Belimo NM24A-SR |
| Torque | 10 Nm |
| Voltage | AC/DC 24 V |
| Control | Modulating |
| Signal / feedback | 2–10 V / 2–10 V |
| Input impedance | 100 kΩ |
| Position accuracy | ±5% |
| Power (run/rest/sizing) | 2 W / 0.4 W / 4 VA |
| Connection | Cable 1 m, 4×0.75 mm² |
| Running time | 150 s / 90° |
| Angle of rotation | Max 95° (limitable) |
| Sound power | 35 dB(A) |
| Mechanical interface | Universal clamp 8–26.7 mm |
| Protection | IP54 / NEMA 2 / Class III (SELV) |
| Ambient | −30…50°C |
| Weight | 0.73 kg |
| Certification | IEC/EN 60730-1 & -2-14; VDI 6022 |
| Air damper size | Up to approx. 2 m² |
