Belimo TFB24-3
SKU: CS4816911MPN: TFB24-3
Damper Actuator, 22 in-lb [2.5 Nm], Spring return, AC/DC 24 V, On/Off, Floating point

Product Details
Features
- Easy-to-adjust mechanical stop to limit damper rotation.
- Cut labor costs with simple direct coupling. Actuator Centers on ½” shaft.
- Clockwise or counterclockwise fail-safe mounting for fail-safe.
- Compact size with the shortest shaft-center to edge distance in the industry - 0.77”.
- True mechanical spring return - the most reliable fail-safe.
- Single line voltage model for on/off application has 100 to 240V (-15/+10%), 50/60 Hz supply power.
- Check damper position easily with clear position indicator.
- Don’t worry about actuator burn-out. Belimo is overload-proof throughout rotation.
- Need to change control direction? Do it easily with a simple switch (modulating actuators).
- Built-in auxiliary switch is easy to use, offers feedback or signal for additional device.
- Microprocessor-controlled brushless DC motor increases actuator life span and reliability, provides constant running time (modulating actuators).
- Rugged housing withstands rough handling in the mechanical room.
- 3 ft. standard cable and conduit connector (not shown) eases installation.
The TFB24-3 is used for On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications.
The TFB 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.
Attributes
| Control | On/Off Floating point |
| Fail-Safe | Spring Return |
| Torque | 22 in-lb |
| Nominal Voltage | AC/DC 24 V |
| Transformer Sizing | 4 VA (class 2 power source) |
| Enclosure | UL Enclosure Type 2 |
| Power Supply | 24 VAC, ±20%, 50/60 Hz, 24 VDC, ±10% |
| Power Consumption In Operation | 2.5 W |
| Power Consumption In Rest Position | 1 W |
| Electrical Connection | 18 GA plenum cable, 3 ft [1 m], with ½” conduit connector |
| Overload Protection | electronic throughout 0…95° rotation |
| Input Impedance | 1000 Ω (0.6 W) |
| Angle Of Rotation | Max. 95°, adjustable with mechanical stop |
| Direction Of Motion Motor | selectable with switch 0/1 |
| Position Indication | Mechanical |
| Running Time (Motor) | 95 s constant, independent of load |
| Running Time Fail-Safe | <25 s |
| Ambient Humidity | max. 95% r.H., non-condensing |
| Ambient Temperature | -22…122°F [-30…50°C] |
| Storage Temperature | -40…176°F [-40…80°C] |
| Degree Of Protection Iec/En | IP42 |
| Degree Of Protection Nema/Ul | NEMA 2 |
| Connection | cable |
| Servicing | maintenance-free |
| Housing Material | UL94-5VA |
| Nominal Voltage Dc | 24 V |
| Nominal Voltage Ac | 24 V |
| Noise Level, Motor | 35 dB(A) |
| Torque Motor | 22 in-lb [2.5 Nm] |
| Electrical Protection | actuators are double insulated |
| Quality Standard | ISO 9001 |
| Noise Level, Fail-Safe | 62 dB(A) |
| Agency Listing | cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2014/30/EU Listed to UL 2043 - suitable for use in air plenums per Section 300.22(C) of the NEC and Section 602 of the IMC |
| Shaft Diameter | ¼…½” round, centers on ½” |
| Fail-Safe Function | Spring return |
| Control Type Web | Floating/3-point |
| Fail-Safe | YES |
Specifications
| SKU | CS4816911 |
|---|---|
| MPN | TFB24-3 |











