Product Overview
Belimo NFB24-S Fail-Safe Actuator
The Belimo NFB24-S is a fail-safe actuator. It controls HVAC air dampers using a 24V power supply.
This actuator provides reliable on/off damper control with a spring return feature. The two built-in auxiliary switches offer added safety and control even in power loss.
Part Details:
Nominal Voltage: AC/DC 24V
Power Consumption: 6 W running, 2.5 W in rest
Transformer Sizing: 8.5 VA
Auxiliary Switches: 2 x SPDT, 3 A resistive (0.5 A inductive) @ AC 250 V
Electrical Connection: (2) 18 GA appliance cables with 1/2" conduit connectors, 3 ft
Overload Protection: Electronic throughout 0-95° rotation
Torque: 90 in-lb [10 Nm]
Direction of Motion: Selectable by ccw/cw mounting
Manual Override: 5 mm hex crank (3/16" Allen), supplied
Angle of Rotation: 95°, adjustable with mechanical end stop, 35-95°
Running Time: 75 seconds (motor), <20 seconds (fail-safe)
Noise Level: 50 dB(A) motor, 62 dB(A) fail-safe
Protection Rating: IP54, NEMA 2
Ambient Temperature: -22°F to 122°F
Storage Temperature: -40°F to 176°F
Humidity: Max 95% RH, non-condensing
Weight: 5.3 lbs
Housing Material: Galvanized steel and plastic housing
Mounting: Uses a universal clamp for secure attachment
Documentation:
