Belimo NFB24 Motor Actuator

The Belimo NFB24 is a spring return actuator designed for on/off control in safety-critical dampers and valve assemblies. Operating on 24VAC or 24VDC, this unit delivers a consistent 90 in-lb torque, ensuring reliable fail-safe positioning during power loss. Engineered for high-cycle performance, the NFB24 utilizes a brushless DC motor regulated by an Application Specific Integrated Circuit (ASIC) to maintain constant speed and torque regardless of load. The mechanical spring return system provides predictable mechanical fail-safe action, while the IP54 rated housing allows for flexible mounting in various environmental conditions. Contractors favor this model for its 95-second run time and universal clamp, which accommodates standard shaft diameters. By removing the need for limit switches, the NFB24 reduces maintenance overhead and prevents motor burnout via electronic stall protection. This actuator is a standard replacement for aging NF Series models, maintaining a footprint compatible with most HVAC mechanical linkages.

• Fail-Safe Reliability: Mechanical spring return ensures the damper or valve returns to its original position upon power interruption.
• Electronic Stall Protection: Internal circuitry detects end-of-rotation and cuts power to prevent motor overheating without requiring auxiliary switches.
• Universal Compatibility: The Belimo NFB24 features a reversible mounting design, allowing for either clockwise or counter-clockwise fail-safe operation.
• Low Power Consumption: Efficient 24V power management reduces the load on control transformers across large-scale commercial installs.
• Extended Service Life: Rated for 60,000 cycles, providing a durable solution for high-traffic air handling units and zone control systems.

How do I change the rotation direction on the NFB24?
Direction is determined by the side of the actuator mounted to the shaft; simply flip the unit over to switch between clockwise and counter-clockwise spring return action.

Can this actuator be used in modulating applications?
No, the NFB24 is an on/off actuator. For 2-10VDC or 4-20mA modulating signals, the NFB24-SR model is required.

Does this unit require an auxiliary switch for position feedback?
The standard NFB24 does not include internal switches. If end-of-travel feedback is needed for the controller, secondary S1A or S2A auxiliary switch add-ons must be installed.

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.