The Belimo NMB24-3 is a 24-volt non-spring return damper actuator designed for HVAC air control systems. It delivers 90 in-lb of torque and operates using on/off or floating (3-point) control, making it suitable for positioning air dampers in ventilation and air handling units.
This actuator is commonly used in commercial HVAC equipment to control airflow through dampers in ducts, mixing boxes, or air handler systems. Because it is a non-spring return, the actuator holds its position when power is removed rather than automatically returning to a default position. This type of actuator is typically selected for applications where a fail-safe position is not required.
The Belimo NMB24-3 operates on 24 VAC/DC power and is designed for direct mounting onto standard damper shafts. It provides reliable and precise damper positioning for regulating airflow, maintaining proper ventilation, and supporting temperature control within building HVAC systems.
The NMB24-3 directly replaces part number ACT0485.
| Torque | 90 in-lb (10 Nm) |
|---|---|
| Voltage | 24V |
| Actuator Type | Non-Spring Return |
| Frequency | 50/60 Hz |
| Transformer Sizing | 4 VA (class 2 power source) |
| Input Impedance | 600 Ω |
| Manual Override | External Push Button |
| Enclosure | UL Enclosure Type 2 |
| Angle of Rotation | Max. 95°, adjustable with mechanical stop |
| Direction of motion motor | selectable with switch 0/1 |
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