Description
The Belimo NFB24-S-N4 Damper Actuator is a spring return HVAC actuator designed for reliable air damper control in commercial and industrial ventilation systems. Operating on 24 V power, the actuator delivers 90 in-lb torque with on/off control functionality and NEMA 4 enclosure protection for demanding environmental conditions. Its reversible mounting configuration and rugged housing design support dependable airflow management in indoor and outdoor HVAC applications.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
HVAC Controls |
| Part Number |
NFB24-S-N4 |
| Subcategory |
Damper Actuators |
| Product Type |
Damper Actuator |
| Control Type |
On/Off |
| Spring Return |
Yes |
| Torque Output |
90 In-Lb |
| Voltage Rating |
24 V |
| Enclosure Rating |
NEMA 4 |
| Application |
Air Dampers |
| Motor Type |
Brushless DC |
| Rotation Angle |
95° |
| Spring Return Time |
Less Than 60 Seconds |
| Auxiliary Switches |
2 SPDT, 3A @ 250V |
| Manual Override |
Manual Crank |
| Input Impedance |
100 kΩ @ 0/2-10 VDC; 500 Ω @ 4-20 mA |
| Operating Temperature |
-22°F to 122°F (-30°C to 50°C) |
| Operating Humidity |
5 to 95% RH |
| Approvals |
cULus, CE, RoHS |
| Conduit Connection |
Four Knockouts for Waterproof Fittings |
| Life Expectancy |
60,000 Cycles / 500,000 Repositions |
| Noise Level |
Less Than 62 dB |
| Weight |
6 lb |
Information About NFB24-S-N4
The NFB24-S-N4 is a heavy-duty damper actuator manufactured by Belimo for controlling air dampers in HVAC and building automation systems. Designed with spring return operation, the actuator automatically returns dampers to their fail-safe position within 60 seconds during power interruption or emergency shutdown conditions. The actuator incorporates a brushless DC motor, manual override crank, and dual SPDT auxiliary switches for enhanced operational flexibility and monitoring capability. Built with NEMA 4 environmental protection, waterproof conduit compatibility, and cULus, CE, and RoHS approvals, the unit is suitable for commercial and industrial installations requiring durable actuator performance.
Key Features:
- 90 In-Lb Torque Output: Provides reliable operation for commercial HVAC air dampers.
- Spring Return Functionality: Automatically returns dampers to the fail-safe position during power loss.
- NEMA 4 Enclosure Protection: Supports operation in demanding indoor and outdoor environments.
- On/Off Control Operation: Enables dependable two-position damper control.
- Brushless DC Motor: Delivers efficient and long-life actuator performance.
- Manual Override Crank: Allows manual actuator positioning during maintenance or setup.
- Dual SPDT Auxiliary Switches: Supports equipment monitoring and control integration.
- Reversible CW/CCW Mounting: Enables flexible actuator installation orientation.
The NFB24-S-N4 delivers the reliability and precision required for commercial and industrial HVAC damper control applications.
