Overview
The Belimo FSLF24 US is a compact, fast-acting spring-return actuator designed for fire and smoke dampers in UL555S applications.
Features
- Rapid 15-second operation for fast emergency isolation response
- Spring-return fail-safe mechanism activates automatically on power failure
- Tested and listed to UL555S standards up to 350°F
- Direct shaft coupling simplifies mounting on fire/smoke damper shafts
Specifications
- Torque: 30 in-lb [3.5 Nm]
- Nominal Voltage: AC/DC 24 V
- Control Signal: On/Off
- Operating Time: 15 seconds (Motor & Spring Return)
- Power Rating: 15 VA running, 3.5 VA holding
Applications
- Operation of UL555S combination fire and smoke dampers
- Emergency smoke management in commercial HVAC systems



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