Description
AFB24-SR – Belimo 24V Spring Return Fail-Safe Proportional Damper Actuator (No Auxiliary Switch)
The Belimo AFB24-SR is a high-quality proportional damper actuator designed for precise modulation of HVAC dampers. It features direct-coupled mounting for shafts up to 1.05" diameter and provides reliable spring return fail-safe operation to ensure positive damper positioning during power loss. This actuator operates with a 0-10 V control input and offers a 2 to 10 V feedback signal for accurate position monitoring.
Key Features
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Proportional control for modulating dampers in HVAC systems
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Direct-coupled mounting with universal clamp for shafts up to 1.05" diameter
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True spring return fail-safe operation ensures damper closure on power loss
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Reversible rotation with cw/ccw mounting options
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95° rotation with graduated position indicator
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Manual override for easy adjustment
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No built-in auxiliary switches (model without aux switch)
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Compatible with 0-10 V control input, 2-10 V feedback output
Specifications
| Attribute | Value |
|---|---|
| Actuator Type | Proportional |
| Fail Safe Mode | Spring Return |
| Power Supply | 24 VAC/DC |
| Torque | 180 lb-in |
| Running Time (Motor) | 95 seconds |
| Running Time (Spring) | < 20 seconds |
| Power Consumption | 5.5 W (running), 3 W (holding) |
| VA Rating | 8.5 |
| Ambient Temperature | -22°F to +122°F (-30°C to +50°C) |
| Control Input | 0-10 V phasecut / 2 to 10 VDC feedback |
| Auxiliary Switch | None |
| Manual Override | Yes |
| Direction of Rotation | Reversible (cw/ccw) |
Applications
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HVAC systems requiring precise damper positioning
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Air handling units (AHUs) in commercial buildings
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Variable Air Volume (VAV) systems for zone control
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Ventilation and exhaust systems needing fail-safe operation
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Industrial process air control requiring reliable spring return
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Integration with building automation and energy management systems
