Belimo FSLF24 Actuator

The Belimo FSLF24 is a dedicated fire and smoke damper actuator designed for life safety applications requiring 30 in-lb torque. Operating on a 24 VAC/DC power supply, this spring-return unit provides failsafe operation, ensuring dampers reach their safety position during power loss or fire alarm triggers. Built for reliability in high-cycle environments, it features a brushless DC motor regulated by an Application Specific Integrated Circuit (ASIC) to maintain consistent timing and prevent stall damage. The 95-degree rotation capacity and 15-second motor drive time allow for rapid response in critical smoke control systems. This UL 555S rated actuator includes a built-in mechanical end stop and is commonly utilized in multi-zone air handling units and pressurized stairwell systems to maintain architectural structural integrity during thermal events. Its compact design facilitates installation in tight plenum spaces while the 1-meter cable provides flexible wiring options for HVAC contractors.

• Mechanical Spring Failsafe: Ensures immediate damper closure or opening upon power interruption to prevent smoke migration.
• Maintenance-Free Design: Brushless DC motor technology eliminates the need for field adjustments or routine motor service.
• High Temperature Durability: Engineered to withstand rigorous UL testing protocols for heat and smoke extraction environments.
• Internal Posistion Indicator: Visual feedback for damper blade position simplifies commissioning and troubleshooting.
• Overload Protection: Automatic electronic shut-off prevents motor burnout at the end of the stroke or in the event of a blockage.

Is the Belimo FSLF24 compatible with existing fire alarm relays?
Yes, the 24V signal can be integrated with standard fire alarm control panels or smoke detectors via thermal links such as the BAE165 US.

Can this actuator be used in place of an FSNF series model?
The FSLF is designed for smaller dampers requiring up to 30 in-lb, whereas the FSNF is for larger applications requiring 70 in-lb; always verify the damper torque requirements before replacing.

What is the maximum run time for this actuator under load?
The motor drive time is approximately 15 seconds, and the spring-return time is also typically under 15 seconds for rapid fire safety response.

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.