Belimo TFRB120 Damper Actuator Spring Return Unit

The Belimo TFRB120-S direct-coupled damper actuator delivers 22 in-lb (2.5 Nm) of torque from a 100–240 VAC supply, providing reliable two-position on/off control with a spring return to the closed position. Built for indoor HVAC damper applications, it carries IP42 and UL Enclosure Type 2 (NEMA 2) protection and offers a 0°–95° rotation range with mechanical stops and a visual position indicator; the shaft accepts 1/4" to 1/2" round shafts centered on 1/2". Power and control are carried by two 1 m (3 ft) 18 AWG appliance cables with 1/2" conduit connectors, and electrical characteristics include running power of about 2.5 W, holding power of about 1.3 W, and a 5 VA transformer sizing; motor travel typically completes in under 75 seconds and fail-safe return in under 25 seconds across an operating temperature range of roughly -20°C to 50°C.