Overview
The Belimo FSTF120 US is a standard 120V spring-return actuator built for on/off actuation of fire and smoke dampers in HVAC ductwork.
Features
- Mechanical spring-return fail-safe response
- Coldweld clamp fits 1/4″ to 1/2″ round damper shafts
- Reversible rotation direction
- UL555 and UL555S compliant operation when paired with approved dampers
Specifications
- Actuator Type: Spring return
- Voltage: AC 120 V
- Control Type: On/Off
- Torque: 18 in-lb [2 Nm]
- Running Time (Fail-safe): <25 s
- Shaft Diameter: 1/4…1/2″ round
- Degree of Protection: IP42, NEMA 2, UL Enclosure Type 2
Applications
- Smoke and combination fire/smoke damper control in commercial buildings
- Safety shut-off airflow management in duct networks



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