Belimo AFB24-SR Spring Return Damper Actuator

Belimo AFB24-SR Spring Return Damper Actuator is a 24 V AC/DC proportional damper actuator with a built‑in spring‑return mechanism that drives the damper to its default position when power is removed. It provides 180 in‑lb (20 Nm) of torque to position dampers in typical HVAC installations and accepts a 2–10 V control signal for precise, modulating output. The unit operates from AC or DC 24 V and includes two independent SPDT auxiliary switches for end‑of‑travel feedback or interlock signaling. Designed for commercial HVAC dampers and air‑handling equipment, the AFB24-SR enables reliable fail‑safe operation and accurate airflow control within building automation systems. Its compact form factor supports installation in confined equipment spaces, and the rugged construction suits standard building environments. In common listings the actuator is described with enclosure ratings such as NEMA 2 / IP54, indicating protection against dust ingress and water spray in typical installation conditions. The combination of spring‑return actuation, proportional control, and dual SPDT signaling makes the AFB24-SR a dependable choice for applications requiring a 24 V damper actuator that returns to a safe position on power loss while preserving control flexibility for HVAC zoning and ventilation strategies.