Belimo FSLF24-S Actuator

The Belimo FSLF24-S is a specialized fire and smoke damper actuator designed for UL555 and UL555S applications in engineered HVAC systems. Providing 30 in-lb of torque at 350°F, this unit ensures reliable fail-safe operation during critical life-safety events. It operates on 24 VAC and features a spring return mechanism that closes dampers upon power loss or high-temperature detection via a thermal sensor. This model includes two internal auxiliary switches (SPST) for remote position signaling, allowing contractors to confirm damper status at the control panel. The brushless DC motor technology prevents burnout by stalling at the end of rotation, extending the service life in high-demand environments. With its 1/2 inch square shaft compatibility and 1-meter appliance cable, the FSLF24-S is a direct replacement for many legacy damper actuators in commercial air handling units and smoke extraction systems.

• Life Safety Compliance: Specifically tested and rated for UL555S Class II leakage standards in smoke control systems.
• High-Temperature Durability: Engineered to maintain fail-safe integrity at elevated temperatures up to 350°F for 30 minutes.
• Auxiliary Feedback: Integrated dual auxiliary switches provide precise end-stop monitoring without external hardware.
• Efficient Power Consumption: Lower holding current reduces the load on 24V transformers in large-scale deployments.
• Simplified Installation: Universal clamp design allows for quick mounting on various damper shaft configurations.

Is the FSLF24-S compatible with manual thermal resets?
Yes, it is designed to interface with Belimo BAE165 or similar thermal links to meet local fire codes for automated closure.

Can I use this actuator for standard multizone volume control?
While capable, this is a specialized fire and smoke actuator; for standard modulating or on/off control without life-safety requirements, a standard LM or NF series is typically recommended.

Does the FSLF24-S require a specific mounting orientation?
It can be mounted in any orientation, provided the shaft is engaged correctly and the 1-meter cable reaches the junction box without tension.

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.