Description
The Belimo NMB24-SR US is a heavy-duty, non-spring return direct coupled damper actuator engineered for demanding commercial and industrial HVAC applications. Delivering 90 in-lb of torque, this actuator provides the muscle needed to reliably drive larger dampers and tight-sealing blade assemblies without the need for a return spring mechanism.
Key Features
- 90 in-lb (10 Nm) torque output — suitable for large or high-resistance dampers
- Non-spring return design — damper holds position on power loss
- Direct coupled mounting — no crank arm or linkage required for simplified installation
- Modulating (SR) control signal — accepts a proportional input for precise positioning
- 24 VAC/DC power supply for compatibility with standard HVAC control systems
- Compact, robust housing designed for long service life
- Manual override function for commissioning and maintenance convenience
- Brushless DC motor technology for quiet, reliable operation
Application
The NMB24-SR US is ideal for use in air handling units (AHUs), variable air volume (VAV) systems, mixed-air plenums, and exhaust/return air damper assemblies where modulating control and positive damper positioning are required. The non-spring return configuration is well suited for applications where the damper must remain in its last commanded position during a power interruption.
Installation & Compatibility
- Direct shaft coupling eliminates linkage hardware and reduces installation time
- Compatible with Belimo damper shafts and industry-standard square or round shaft profiles
- Mounts in any orientation for flexible installation
- Designed and listed for use in the US market (US suffix)
Why Choose Belimo
Belimo is the global leader in damper actuator technology, trusted by HVAC engineers and contractors for precision, durability, and ease of installation. The NMB24-SR US continues that tradition, offering a reliable modulating solution backed by Belimo’s industry-leading warranty and technical support.
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