Belimo FSLF120-S Actuator

The Belimo FSLF120-S is a specialized fire and smoke damper actuator engineered for life safety applications in HVAC systems. Operating on a 120 VAC power supply, this spring return actuator delivers 30 in-lb of torque, ensuring reliable fail-safe operation during power loss or fire alarm triggers. Designed for integration with UL555 and UL555S rated dampers, it features a brushless DC motor managed by an Application-Specific Integrated Circuit (ASIC) to provide consistent performance and prevent motor burnout. The inclusion of two built-in auxiliary switches (SPST) allows for precise end-stop monitoring and position feedback to the building automation system. With its compact footprint and high-temperature rating, the FSLF120-S Belimo is the standard for localized fire safety control. Its fast cycling time of less than 15 seconds ensures rapid response in critical containment zones, maintaining the integrity of fire-rated partitions across commercial facilities.

Key Benefits for HVAC Professionals

• Universal Compatibility: Fits various damper shafts, providing a seamless drop-in replacement for failed fire smoke actuators.
• Enhanced Reliability: The spring return fail-safe mechanism ensures the damper returns to its safety position immediately upon signal loss.
• Simplified Wiring: Equipped with a 1-meter halogen-free appliance cable for efficient installation in tight plenum spaces.
• Integrated Monitoring: Dual auxiliary switches facilitate easy verification of complete open/closed damper status.
• Durable Construction: Rated for high-temperature environments, specifically tested for life safety smoke control systems.

Common Installation Questions

Can the FSLF120-S be used for both 120V and 24V systems?
No, this specific model is designed exclusively for 120 VAC circuits. For 24-volt applications, a different model within the FSLF series is required.

Does this actuator support manual override?
Yes, it typically includes a manual crank to allow for field testing and damper positioning during commissioning while power is disconnected.

What is the maximum square footage of damper this unit can drive?
The 30 in-lb torque rating is generally suitable for fire and smoke dampers up to 4 square feet, depending on the manufacturer's friction specifications.

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.