Belimo FSAFB24-SR Actuator

The Belimo FSAFB24-SR is a high-torque fire and smoke actuator designed for the fail-safe operation of UL555 and UL555S rated dampers in HVAC systems. Delivering 180 in-lb of torque, this actuator provides reliable proportional control using a 2-10 VDC control signal. It operates on 24 VAC/DC nominal power and is engineered for high-temperature durability, ensuring damper closure during critical life safety events. This model serves as the direct replacement for the FSAF24-SR, offering the same footprint with updated internal drive electronics for improved longevity. The spring-return mechanism is designed to handle high-static pressure loads, while the 1m halogen-free cable simplifies field wiring. It meets stringent UL requirements for smoke control systems and is suitable for both new installations and retrofitting legacy fire-life safety dampers.

• 180 in-lb Multi-Section Torque: Provides sufficient force for large or high-pressure dampers.
• Modulating Control: Utilizes a 2-10 VDC signal for precise positioning and integration with building automation systems.
• High-Temperature Rating: Specifically tested to withstand the heat requirements of UL555S applications.
• Universal Compatibility: Acts as the FSAF24-SR replacement, ensuring a seamless mechanical and electrical upgrade path.
• Fail-Safe Reliabilty: Mechanical spring-return ensures positive damper closure upon loss of power.

How do I wire the FSAFB24-SR for proportional control?
The unit uses a standard 3-wire or 4-wire setup where the 2-10 VDC input signal dictates the damper position relative to the 95-degree rotation arc.

Is the FSAFB24-SR compatible with 120V systems?
No, this model is rated for 24 VAC/DC. If you are replacing a 120V actuator, you will need a step-down transformer or the FSAFB120 series equivalent.

Can this actuator be used in hazardous environments?
This actuator is designed for fire and smoke dampers in standard commercial HVAC ducts. Refer to the specific UL listing of your damper assembly to ensure compliance.

This item is not eligible for free shipping.

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.