Belimo GKB24-SR Damper Actuator 24 VAC Spring Return

Belimo GKB24-SR is an electronic fail-safe damper actuator with spring return for 24 V HVAC dampers. It delivers 360 in-lb (40 Nm) of torque to reliably position damper blades in ventilation systems and is a modulating actuator that accepts a 2–10 V DC control signal for proportional airflow control. Powered from 24 VAC (AC/DC 24 V), the unit includes an electronic fail-safe mechanism that drives the damper to a predefined fail position when power is removed, supporting safety and smoke-control requirements. Designed for commercial HVAC use, this model is well suited for dampers in air-handling units, mixing boxes, and economizers where precise, dependable fail-safe operation is essential. As part of Belimo’s fail-safe family, the GKB24-SR blends robust torque with modulating control and a spring-return action to deliver reliable performance in challenging environments.