Belimo FSNF24-S US Fire & Smoke Damper Actuator (24V, 8Nm, On/Off)

Immediately available

Belimo FSNF24-S US Fire & Smoke Damper Actuator (24V, 8Nm, On/Off)

Immediately available

Brand: Belimo

Product type: Damper Actuator

Operating Voltage: 24 VAC/DC

Force / Torque: 8 Nm

Control Signal: 2 Position

Belimo FSNF24-S US fail-safe spring-return actuator for typical fire & smoke damper applications; AC/DC 24 V, on/off, 8 Nm (≈7.9 Nm), 15 s/90° motor, <15 s spring return, 2x SPDT auxiliary switches, NEMA 1 / UL Type 1, UL 2043 compliant (air plenums)

Product information "Belimo FSNF24-S US Fire & Smoke Damper Actuator (24V, 8Nm, On/Off)"

The Belimo FSNF24-S US is a spring-return (fail-safe) actuator designed for fire and smoke damper applications. The actuator is typically mounted in its fail-safe position with the damper blades commonly closed. When power is applied, the actuator drives the damper to the open position while tensioning the internal spring. If the power supply is interrupted, the spring returns the damper to its fail-safe safety position.

The “-S” model includes two auxiliary switches (2x SPDT) for end-position indication and interlock control to the fire interface module or BMS.

Applications

UL555 / UL555S fire and combination fire & smoke dampers
Fail-safe damper control (spring return on power loss)
End-position feedback / interlocks using built-in auxiliary switches
HVAC fire safety damper control in risers, AHUs, and smoke control branches

Technical Specifications

Specification	Value
Model	FSNF24-S US
Supply	AC/DC 24 V, 50/60 Hz
Control	On/Off (Open/Close)
Torque	8 Nm (70 in-lb) @ 177°C for 30 min
Rotation angle	95°
Running time	15 s / 90° (motor); <15 s (fail-safe)
Power consumption	27 VA (operation); 3 W / 6.5 VA (rest); 55 VA (end stop)
Transformer sizing	40 VA
Inrush current	30 A
Auxiliary switches	2x SPDT, 1x 10° / 1x 85°
Enclosure	NEMA 1 (UL Type 1)
Ambient	0…50°C; max 95% RH (non-condensing)
Storage	-40…80°C
Weight	3.0 kg (6.5 lb)
Compliance	cULus (UL60730); UL 2043 compliant; NYC MEA 197-07-M