Overview
The Belimo FSTF120-S US is a 120V spring-return damper actuator with two built-in SPST auxiliary switches for fire and safety system monitoring.
Features
- Dual SPST switches provide end-position status indication
- Dependable mechanical spring return for emergency shut-off
- Anti-rotation strap and stud mounting support
- Suitable for solid and hollow damper axle shafts
Specifications
- Actuator Type: Spring return
- Voltage: AC 120 V
- Control Type: On/Off
- Torque: 18 in-lb [2 Nm]
- Auxiliary Switches: 2 x SPST
- Running Time (Fail-safe): <25 s
- Degree of Protection: IP42, NEMA 2, UL Enclosure Type 2
Applications
- Operation of fire and smoke dampers in HVAC ventilation ducts
- Life safety systems needing switch status verification



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