Belimo FSTF120 Actuator

The Belimo FSTF120 Fire/Smoke Actuator is a specialized 120V AC solution engineered for life-safety applications in commercial HVAC systems. This fail-safe spring return actuator provides 18 in-lb of torque, ensuring reliable fire and smoke damper control under extreme conditions. Designed for UL555 and UL555S compliance, it features a 75-second motor drive time and a rapid fail-safe response of under 25 seconds to prevent smoke migration. The NEMA 2 rated housing and 95° rotation angle make it a direct replacement for many legacy HVAC damper actuators. Operating at 2W running and 1.5W holding, this unit optimizes energy efficiency while maintaining critical safety requirements. Whether you are performing a Belimo actuator replacement or a new installation, the FSTF120 offers the 120V on/off control necessary for rigorous fire-safety protocols and building code adherence.

• Universal Compatibility: Operates on 120V AC/DC, making it compatible with standard building electrical systems without additional transformers.
• High-Speed Fail-Safe: Mechanical spring return ensures the damper reaches its safety position in less than 25 seconds during power loss.
• Rugged Durability: Engineered for indoor environments with a 32°F to 122°F operating range and an enclosure that passes UL leakage testing.
• Flexible Mounting: Simple CCW/CW orientation selection allows for easy integration into various damper configurations.
• Simplified Wiring: 18 AWG appliance cable provides a straightforward connection for rapid deployment on the job site.

Is the Belimo FSTF120 suitable for both fire and smoke dampers?
Yes, this actuator is specifically designed and UL-listed for dual-purpose fire and smoke damper applications, meeting stringent safety standards for both containment and evacuation air paths.

What is the torque rating for the FSTF120?
The FSTF120 provides 18 in-lb (2 Nm) of torque, which is generally suitable for smaller dampers. Always verify the damper manufacturer’s torque requirements before installation to ensure proper seal and operation.

How do I change the direction of rotation?
The direction of motion is selectable by simply flipping the actuator over on its mounting shaft to achieve either clockwise or counter-clockwise fail-safe operation.

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.