Belimo FSAF24A-S Actuator

The Belimo FSAF24A-S is a high-torque fire and smoke damper actuator designed for On/Off control in strictly regulated life safety applications. Engineered as the direct FSAF24-S replacement, this 24V spring return actuator provides 180 in-lb of torque to ensure fail-safe closure of dampers during power loss or fire alarm triggers. It features integrated dual auxiliary switches for precise end-position feedback to the fire alarm control panel or BMS. The brushless DC motor technology offers consistent timing and long-term reliability under high-load conditions. Built for UL555 and UL555S compliance, the FSAF24A-S operates at temperatures up to 350°F during fire emergency conditions. For contractors, the universal clamp and robust housing allow for straightforward installation on multi-blade dampers or radial vanes, ensuring the system meets local mechanical codes and smoke control requirements without unnecessary field adjustments.

Key Benefits

• Fail-Safe Reliability: Mechanical spring return ensures the damper returns to the safety position immediately upon power interruption.
• Integrated Feedback: Two internal SPDT auxiliary switches provide remote status indication for open and closed positions.
• High Torque Output: Delivers 180 in-lb (20 Nm) for handling heavy damper blades and resisting high air velocities.
• Modern Replacement: Specifically optimized to replace the legacy FSAF24-S model with improved efficiency and standard wiring.
• Thermal Endurance: Tested to withstand extreme temperatures for smoke control sequences in accordance with UL standards.

Common Questions

Is the FSAF24A-S compatible with existing FSAF24-S wiring?

Yes, the FSAF24A-S is the direct functional and physical updated version, utilizing standard 24V AC/DC power and the same auxiliary switch logic for easy retrofitting.

Can this actuator be used for standard HVAC volume control?

No, this unit is specifically rated for fire and smoke damper applications. Using a life-safety actuator for standard modulation can lead to premature wear and code violations.

How do the auxiliary switches improve system monitoring?

The switches allow the BMS to verify that the damper has reached its full stroke, which is critical for AEO-optimized HVAC systems requiring automated safety verification.

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.