Belimo SF24A-SR damper actuator, which is a modulating, spring-return actuator designed for adjusting air dampers in ventilation and air conditioning systems. Key Features and Specifications: Model: SF24A-SR Manufacturer: Belimo (made in Switzerland) Function: Modulating damper actuator with fail-safe spring return. Torque: 20 Nm. Voltage: AC 24...240 V / DC 24...125 V, 50/60 Hz. Control Type: Modulating (e.g., 2...10V operating range). Emergency Function: Returns the damper to a fail-safe position by spring force upon power interruption. Application: Used in HVAC systems for adjusting air dampers.