Overview
The Belimo FSLF120 US is a UL-listed spring-return actuator specifically engineered for life safety applications in fire and smoke dampers within HVAC systems.
Features
- Spring-return mechanism ensures immediate fail-safe positioning during power interruption
- Fast response time of approximately 15 seconds for run and spring return
- Direct-coupled mounting eliminates the need for complex linkages
- Rugged construction compliant with strict smoke and fire safety standards
Specifications
- Torque: 30 in-lb (3.5 Nm)
- Nominal Voltage: 120 V AC
- Control Type: On/Off
- Running Time: 5–19 seconds (Fail-safe < 15 seconds)
- Enclosure Rating: IP30, NEMA 1, UL Enclosure Type 1
Applications
- Fire and smoke dampers in commercial and high-rise structures
- Combination fire/smoke HVAC safety systems
- Life safety systems in healthcare, educational, and public facilities



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