Belimo NFB24 Spring Return Damper Actuator (24V, 10Nm, On/Off)

Immediately available

Belimo NFB24 Spring Return Damper Actuator (24V, 10Nm, On/Off)

Immediately available

Brand: Belimo

Product type: Damper Actuator

Operating Voltage: 24 VAC/DC

Force / Torque: 10 Nm

Control Signal: 2 Position

Belimo NFB24 fail-safe spring return actuator for HVAC dampers; AC/DC 24 V, On/Off, 10 Nm (90 in-lb), 75 s/90° motor, <20 s spring return, NEMA 2 / UL Type 2, UL 2043 compliant (air plenums).

Product information "Belimo NFB24 Spring Return Damper Actuator (24V, 10Nm, On/Off)"

The Belimo NFB24 is a basic fail-safe actuator for On/Off control of HVAC dampers in typical commercial applications. It provides true spring return for reliable fail-safe operation and positive close-off on airtight dampers. The actuator can be mounted CW or CCW to select motor direction and fail-safe direction. It is direct-coupled via universal clamp to a damper shaft up to 1.05″ diameter, with optional crank arm/mounting brackets available for non-direct-coupled applications.

Applications

On/Off fail-safe control of HVAC dampers (AHU / duct)
Dampers requiring spring return safety position on power loss
Tight shut-off dampers (spring maintains constant torque with/without power)
Direct-coupled damper shafts up to 1.05″ diameter

Technical data

Specification	Value
Model	NFB24
Supply	AC/DC 24 V, 50/60 Hz
Voltage range	AC 19.2–28.8 V / DC 21.6–28.8 V
Control	On/Off
Torque	10 Nm (90 in-lb)
Rotation	95° (adjustable 35…95°)
Run time (motor)	75 s / 90°
Spring return time	<20 s @ -20…50°C; <60 s @ -30°C
Power consumption	6 W (op); 2.5 W (rest)
Transformer sizing	8.5 VA
Overload protection	Electronic throughout 0…95°
Manual override	5 mm hex crank (3/16″ Allen)
Connection	18 AWG cable, 1 m, with 1/2″ NPT conduit connector
Enclosure	NEMA 2 / UL Type 2
Ambient	-30…50°C; max 95% RH non-condensing
Storage	-40…80°C
Weight	1.8 kg (3.9 lb)
Compliance	cULus (UL60730); UL 2043 compliant