Belimo AMB24-3-S 180 in-lb Non Fail-Safe Damper Actuator with SPDT Switch

The Belimo AMB24-3-S is a heavy-duty non fail-safe damper actuator designed for on/off and floating point control of HVAC dampers. Delivering 180 in-lb (20 Nm) of torque, this actuator operates on AC/DC 24V power and features a built-in SPDT auxiliary switch for enhanced system control and monitoring.

Key Features:

• 180 in-lb (20 Nm) torque rating for reliable damper control
• Non fail-safe (non-spring return) design remains in position during power loss
• AC/DC 24V operation with universal voltage compatibility
• On/off and floating point control capability
• Built-in SPDT auxiliary switch adjustable from 0 to 95° for safety interfacing or signaling
• 95° rotation range with visual position indicator
• Sensorless brushless DC motor controlled by ASIC for precision and reliability
• Digital rotation sensing (DRS) function prevents damage in stall conditions
• Direct mounting to damper shafts up to 1.05 inches in diameter via universal clamp
• Manual override button on actuator cover for easy disengagement
• Electronic overload protection eliminates need for limit switches
• Reduced power consumption in holding mode (0.4W holding, 2.5W running)
• NEMA 2/IP54 rated housing for protected environments
• 95-second motor running time for 90° rotation

The AMB24-3-S includes an anti-rotation strap to prevent lateral movement and automatically stops when reaching end positions. The double-insulated auxiliary switch requires no electrical ground connection, making installation straightforward. Add-on auxiliary switches or feedback potentiometers can be easily mounted directly to the actuator body for additional control functions. Ideal for building automation systems requiring reliable damper positioning with auxiliary switch signaling capabilities.