Belimo FSLF120-S-FC Actuator

The Belimo FSLF120-S-FC is a specialized fire and smoke damper actuator designed for life safety applications in HVAC systems. Operating on 120V AC, this spring return actuator delivers 30 in-lb of torque at 350°F, ensuring reliable operation under extreme conditions. It is engineered for on/off control and features integrated auxiliary switches (two SPDT) for providing end-stop verification to the fire alarm or building automation system. The FSLF series is specifically tested to meet UL 555 and UL 555S standards for smoke and fire dampers, offering a 15-second fail-safe response time. With its rugged steel housing and direct-coupled mounting, this motor is a drop-in replacement for failed units in commercial air handling systems where tight shut-off and high-temperature resilience are required. Its compact design facilitates installation in tight plenum spaces while maintaining structural integrity for multi-section dampers.

• UL 555S Compliance: Designed specifically for life safety systems requiring 250°F or 350°F rated operation.
• High-Torque Fail-Safe: Reliable 30 in-lb mechanical spring return ensures dampers close completely during power loss.
• Integrated Signaling: Built-in auxiliary switches eliminate the need for external mounting kits to confirm damper position.
• Fast Response Time: Engineered to cycle in under 15 seconds to meet strict smoke control sequence requirements.
• Direct Drive: Features a universal square shaft clamp for simplified mounting and maintenance in the field.

What is the difference between the FSLF120-S and the FSLF120-S-FC?
The -FC suffix indicates the inclusion of integrated auxiliary switches for position feedback, while the base models may require separate installation for status monitoring.

Can this actuator be used in variable air volume (VAV) systems?
This is an on/off actuator intended for safety isolation; it is not designed for proportional or modulating control in VAV reheat applications.

Is the Belimo FSLF120-S-FC compatible with 24V controllers?
No, this specific model requires a 120V AC power supply. Applying 24V will result in failure to actuate.

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.