Product information "Belimo FSLF24-S Fire & Smoke Damper Actuator (24V, 3.5Nm, On/Off)"
The Belimo FSLF24-S is a compact spring-return (fail-safe) actuator intended for fire and smoke damper applications where a reliable safety position is required. It operates on 24 V supply and provides on/off open/close control. In the event of power loss, the actuator’s internal spring drives the damper to the fail-safe safety position.
The “-S” version includes auxiliary switch feedback for damper end-position signalling and safety interlocks to the fire interface module or BMS.
Applications
Fire & smoke damper actuation for small/light dampers
Fail-safe damper control (spring return to safety position on power loss)
End-position feedback and interlocks (fire interface / BMS)
HVAC ventilation safety damper control in risers, small AHUs, and smoke control branches
Technical Specifications
Specification
Value
Model
FSLF24-S
Supply
AC/DC 24 V, 50/60 Hz
Control
On/Off (Open/Close)
Torque
3.5 Nm (30 in-lb) @ 177°C for 30 min
Rotation angle
95°
Running time
15 s / 90° (motor); <15 s (fail-safe)
Power consumption
15 VA (operation); 2.5 W / 3.5 VA (rest); 25 VA (end stop)
Transformer sizing
24 VA
Inrush current
8.2 A
Auxiliary switches
2x SPST, 3 A resistive (0.5 A inductive) @ AC 250 V; 1x 10° / 1x 85°
Wiring
Supply: 2 leads, 0.9 m, 18 AWG with 1/2″ NPT; Aux: 0.9 m, 4x 18 AWG with 1/2″ NPT
Enclosure
NEMA 1 (UL Enclosure Type 1)
Ambient
0…50°C; max 95% RH (non-condensing)
Storage
-40…80°C
Weight
1.6 kg (3.4 lb)
Compliance
cULus (UL60730); UL 2043 compliant (air plenums); NYC MEA 197-07-M
Documents
Datasheet
Belimo FSLF24-S Fire & Smoke Damper Actuator 24V 3.5Nm
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