We ship to Canada
  our Prices do not include
    Tax & Merchant Fees
Browse Categories

Mailing Lists


MSRP: $1,251.00
Price: $469.13
You Save: $781.87 (62 %)


If needed, use the space below to type in any additional actuator configuration required for your order:
Actuator Customization180 characters remaining
free shipping
Belimo Part Number: NFBUP-S N4

Technical Data Sheet

Technical Attributes
Actuator: NFBUP-S N4
Torque 90 in-lb [10 Nm]
Control Input On/Off
Input Impedance --
Position Feedback --
Running Time (motor) <75 seconds
Running Time (fail-safe) 20 sec @ -4°F to +122°F [-20°C to +50°C], <60 sec @ -22°F [-30°C]
Auxiliary Switch 2 x SPDT 3A (0.5A) @ 250 VAC, UL approved, one set at +10°, one adjustable 10° to 90°
Power Supply 24240 VAC +10% / -20%, 50/60 Hz, 24125 VDC ± 10%
Power Consumption Running: 6 W; Holding 2.5 W
Transformer Sizing 6 VA @ 24 VAC (Class 2 power source), 6.5 VA @ 120 VAC, 9.5 VA @ 240 VAC
Electrical Connection Two 3 ft, 18 GA appliance cables with 1/2" conduit connectors
Overload Protection Electronic throughout 0° to 95° rotation
Shaft Diameter Standard: 1/2" to 1.05" round, centers on 3/4" with insert, 1.05" without insert
Angle of Rotation 95° (adjustable with mechanical end stop, 35° to 95°)
Direction of Rotation (motor) Reversible with CW/CCW mounting
Direction of Rotation (fail-safe) Reversible with CW/CCW mounting
Position Indication Visual indicator, 0° to 95° (0° is spring return position)
Manual Override 5 mm hex crank (3/16" Allen), supplied
Humidity Max. 95% RH non-condensing
Ambient Temperature -22°F to +122°F [-30°C TO +50°C]
Ambient Temperature (safety) --
Storage Temperature -40°F to +176°F [-40°C TO +80°C]
Noise Level <50dB(A) motor @ 75 seconds, 62dB(A) spring return
Housing Material zinc coated metal and plastic casing
Housing NEMA 4, IP66, Enclosure Type 4
Agency Listing cULus acc. To UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. To 2004/108/EC & 2006/95/EC
Quality Standards ISO 9001
Weight N/A


The NFB and NFX series actuators provide true spring return operation for reliable failsafe application and positive close off on air tight dampers. The spring return system provides constant torque to the damper with, and without, power applied to the actuator.

The NFB and NFX series provides 95deg of rotation and is provided with a graduated position indicator showing 0deg to 95deg. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches.
The NFB24-S and NFX24-S versions are provided with two built-in auxiliary switches. These SPDT switches are provided for safety interfacing or signaling, for example, for fan start-up. The switching function at the fail-safe position is fixed at +10deg, the other switch function is adjustable between +10deg to +90deg. The NFB24, NFB24-S, NFX24 and NFX24-S actuator is shipped at +5deg (5deg from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.
  True mechanical spring return the most reliable fail-safe.
  Mount for clockwise or counterclockwise fail-safe.
  Check damper position easily with clear position indicator.
  Dont worry about actuator burn-out. Belimo is overload-proof throughout rotation.
  Built-in mechanical stop to adjust angle of rotation.
  Manual override crank speeds installation
  Need to change control direction? Do it easily with a simple switch (modulating actuators).
  Incorporated breather membrane optimizes performance in harsh airstream environments.
  Built-in auxiliary switches are easy to use, offers feedback orsignal for additional device (-S models).
  Microprocessor-controlled brushless DC motor increasesactuator life span and reliability, provides constant running time (modulating actuators).
Item Number: NFBUP-S N4
Manufacturer: Belimo
Manufacturer Part No: NFBUP-S N4

Product Reviews

Rate This Product:
or Create a Review
(0 Ratings, 0 Reviews)