Belimo FSAF120A Actuator

The Belimo FSAF120A Actuator is the engineered successor to the legacy FSAF120 model, specifically designed for high-torque fire and smoke damper applications. This 120V spring return actuator delivers a robust 180 in-lb of torque, providing a significant performance increase over the older 133 in-lb versions. Built to withstand extreme conditions, it is rated for operation at 350°F [177°C] for 30 minutes, ensuring reliable fail-safe positioning during critical life safety events. This on/off damper actuator features a universal cold-weld clamp that secures to shafts ranging from 1/2" to 1.05", utilizing a V-bolt design that maintains a slip-free connection without crushing hollow jackshafts.

As a UL555S listed component, the FSAF120A is essential for contractors performing HVAC fire damper replacement or new installations requiring strict NEC 300.22(c) and IMC 602.2 plenum ratings. The unit operates with a 25-second motor drive time and a rapid <15-second spring return fail-safe response. For technicians, the CW/CCW mounting flexibility and mechanical position indicator simplify field commissioning and verification of life safety damper status. Note that the FSAF120A utilizes the updated KH-AFB crank arm for linkage applications while remaining compatible with the classic ZG-AF US leg kits.

• Increased Torque Capacity: Delivers 180 in-lb [20 Nm] to handle larger dampers up to 16 sq. ft. compared to the original FSAF series.
• High-Temperature Reliability: Rated for 350°F [177°C], meeting the latest UL standards for smoke control systems.
• Simplified Installation: The direct coupled actuator design with a universal clamp eliminates the need for complex linkages in most applications.
• Durable Construction: Features a galvanized steel housing and permanently lubricated steel gears for maintenance-free operation.
• Fail-Safe Security: True mechanical spring return ensures the damper returns to the safety position immediately upon power loss.

Is the FSAF120A a direct replacement for the FSAF120?
Yes, the FSAF120A is the official updated version. It offers higher torque and the same footprint, though it lacks the manual override found on some legacy models to comply with updated UL 60730 requirements.

What size fuse should be used with this 120VAC actuator?
Safety protocols recommend using a 0.5 A slow-blow fuse for 120V models to prevent nuisance tripping during peak current draw when the motor reaches its end-stop.

Can I power multiple FSAF120A actuators in parallel?
Yes, they can be wired in parallel. Ensure your transformer is sized correctly, accounting for the 30 VA running and 7.5 W holding power consumption per unit.

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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.