TFB24 – Belimo Spring Return Actuator


The TF series actuators provide true spring return operation for reliable fail-safe application and positive close off on air tight dampers. The spring return system provides consistent torque to the damper with, and without, power applied to the actuator. The TF series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 90°. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. Power consumption is reduced in holding mode.


2 in stock


Product Type:   Damper Actuator
Fail-Safe:   Spring Return
Torque:   22 in-lbs [2.5 Nm] minimum
Control Input:   On/Off
Input Impedance:   —
Position Feedback:  —
Running Time (Motor):   <75 sec
Running Time (Fail-Safe):   <25 sec @ -4°F to 122°F [-20°C to 50°C], < 60 sec @ -22°F [-30°C]
Auxiliary Switch:  —
Power Supply:   24 VAC ± 20%, 50/60 Hz, 24 VDC ± 10%
Power Consumption (Holding):   1.3 W
Power Consumption (Running):  2 W
Transformer Sizing:  5 VA (class 2 power source)
Electrical Connection:  3 ft [1 m], 18 GA appliance cable with 1/2″ conduit connector
Overload Protection:   electronic throughout 0° to 95° rotation
Shaft Diameter:   1/4″ to 1/2″ round, centers on 1/2″
Angle of Rotation:   max. 95°, adjustable with mechanical stop
Direction of Rotation (Motor):   reversible with CW/CCW mounting
Direction of Rotation (Fail-Safe):   reversible with CW/CCW mounting
Position Indication:   visual indicator, 0° to 95° (0° is full spring return position)
Manual Override:   —
Humidity:   max. 95% RH non-condensing
Ambient Temperature:   -22°F to +122°F [-30°C to +50°C]
Ambient Temperature (Safety):   —
Storage Temperature:   -40°F to +176°F [-40°C to +80°C]
Noise Level (Motor):   <50 dB (A)
Noise Level (Fail-Safe):   <62 dB (A)
Housing Material:   UL94-5VA
Housing:   NEMA 2, IP42, UL enclosure type 2
Agency Listings:   cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EC
Quality Standards:   ISO 9001
Weight:  1.4 lb [0.6 kg]

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Additional information

Weight 1.4 lbs


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