Belimo AMX120-3 Actuator

The Belimo AMX120-3 is a high-torque damper actuator designed for HVAC air handling units and large-scale ventilation systems. Operating on a universal 100-240V AC power supply, this non-spring return actuator delivers a robust 180 in-lb torque, providing reliable control for dampers up to 45 square feet. As a versatile on/off or floating point control solution, it offers precise positioning without the need for additional linkages. This unit is the designated direct replacement for the Belimo SM220, featuring a standardized U-clamp that accepts 5/16-inch to 3/4-inch round shafts or 3/8-inch to 5/8-inch square shafts. The AMX120-3 utilizes a brushless DC motor controlled by an ASIC to ensure constant torque and prevent motor burnout at end-of-stroke. With its NEMA 2 (IP54) enclosure and manual override button, this actuator is a standard for contractors requiring performance in demanding mechanical environments.

• Universal Compatibility: Operates on any voltage from 100V to 240V AC, simplifying inventory and field replacements.
• High Torque Output: Rated at 180 in-lb (20 Nm) to handle high-static pressure dampers and heavy-duty louvers.
• Enhanced Durability: Electronic stall detection protects the gear train without the need for mechanical limit switches.
• Ease of Installation: Direct-coupled mounting and a simple polarity-neutral 3-wire connection reduce time on the job site.
• Legacy Support: Seamlessly replaces the discontinued SM220 series using existing mounting footprints.

Is the Belimo AMX120-3 a spring-return actuator?
No, the AMX120-3 is a non-spring return (NSR) actuator. It maintains its last position upon loss of power, making it ideal for standard volume control dampers.

What is the difference between on/off and floating point control in this model?
The on/off control move the damper fully open or closed, while floating point control allows the controller to stop the motor at any intermediate position for precise airflow modulation.

Can I install the AMX120-3 outdoors?
While it features a NEMA 2 rating for indoor protection against dripping water, you must use a specialized weather shield if mounting in an outdoor or exposed environment.

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.