Belimo NFB24-S Actuator

The Belimo NFB24-S is a high-torque spring return damper actuator designed for reliable on/off control in demanding HVAC systems. Engineering for 90 in-lb of torque, this unit provides failsafe operation, ensuring dampers return to a predetermined safety position during power interruptions. Operating on both 24VAC and 24VDC, the NFB24-S features universal compatibility with standard control signals. This model includes an integrated SPDT auxiliary switch, allowing for precise end-stop signaling or interlocking with additional equipment like fans or boilers. The mechanical fail-safe mechanism is optimized for airtight closures in larger dampers and control valves. Designed for professional installation, it utilizes a universal multi-function clamp for direct mounting on shafts ranging from 1/2-inch to 1.05-inch diameter. This HVAC actuator maintains a low power consumption profile while providing consistent 90 in-lb torque output for lifecycle durability in critical air handling applications.

• Failsafe Reliability: Integrated spring return mechanism ensures positive closure or opening upon loss of power.
• High Torque Output: Delivers 90 in-lb [10 Nm] of torque, suitable for mid-to-large scale dampers.
• Dual Voltage Support: Flexible 24V AC/DC power input simplifies inventory and field wiring.
• Auxiliary Feedback: Built-in SPDT switch provides 0 to 95° adjustable signaling for system confirmation.
• Direct Mounting: Simple installation using a universal clamp to reduce labor time on the job site.

What is the difference between the NFB24 and the NFB24-S?
The NFB24-S includes a built-in auxiliary switch for status feedback, whereas the standard NFB24 does not.

Can I adjust the rotation direction on this Belimo actuator?
Yes, the direction of rotation is determined by the mounting orientation (CW/CCW mounting) relative to the damper shaft.

What size damper can the NFB24-S handle?
While individual damper friction varies, this 90 in-lb actuator typically supports dampers up to approximately 22 square feet.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.