Belimo LMX120-3 Actuator

The Belimo LMX120-3 is a non-spring return damper actuator designed for reliable on/off or floating point control in HVAC systems. Operating on a universal 100 to 240V AC power supply, this direct-coupled actuator delivers 45 in-lb of torque, making it suitable for small to medium-sized dampers or air handling units. It features a brushless DC motor controlled by an Application Specific Integrated Circuit (ASIC), which provides consistent running time and overload protection throughout its 95-degree rotation. The LMX120-3 maintains a NEMA 2 / IP54 rating, ensuring durability in demanding mechanical environments. Note that for new installations or retrofits, the LMB120-3 serves as the direct manufacturer replacement, offering identical performance specifications. This unit supports easy manual override via a push-button and provides a clear position indicator for simplified troubleshooting and field commissioning of VAV systems and control valves.

Key Benefits

• Universal Voltage Compatibility: Operates efficiently across 100-240V AC ranges, reducing inventory complexity for contractors.
• Maintenance-Free Operation: Features a brushless DC motor designed for long-term reliability without the risk of stall-related failures.
• Precision Control: Ideal for floating control or on/off applications, ensuring accurate damper positioning.
• Field Versatility: Direct-coupled design allows for easy installation on damper shafts without complex linkages.
• Integrated Safety: Built-in electronic stall protection stops the motor automatically if an obstruction is detected, protecting the gear train.

Common Questions

Is the Belimo LMX120-3 a direct replacement for older units?

The Belimo LMX120-3 has been succeeded by the LMB120-3. If you are replacing an existing LMX model, the LMB series offers the same 45 in-lb torque and 120/240V electrical footprint.

Can this actuator be used in failsafe applications?

No, this is a non-spring return (NSR) actuator. In the event of a power loss, the actuator will remain in its last position. For applications requiring a return-to-zero safety position, a spring-return model is required.

How do I reverse the rotation direction on the LMX120-3?

The direction of rotation can be adjusted using the external switch located on the actuator housing, allowing for either clockwise or counter-clockwise operation based on the damper configuration.

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.