Belimo AF NEMA 4 Series Spring Return Damper Actuator

Manufacturer: Belimo

The AFB N4(H) and AFX N4 series actuators provide true spring return operation for reliable fail-safe 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 AFB N4(H) and AFX N4 series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°.

The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches.

The AFB24-S N4(H), AFX24-S N4 version 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 +10°, the other switch function is adjustable between +10° to +90°.

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Features Applications Model

180 in-lb (20 Nm) min. torque. 35% more than original AF.
360 in-lb (40 Nm) combined minimum torque for two actuators mounted in tandem. 432 in-lb (48 Nm) for three.
AFB24-MFT95, AFX24-MFT95 for Honeywell 0-135 ohm control, replaces today’s AF24-MFT95 US.
New smaller housing for tight spaces, plus reduced shaft-center to edge distance: 1.25” compared to 1.97” with
today’s AF.
Improved motor run times: AFB, AFX Original AF
MFT: 70 to 220 sec 75 to 300 sec
Same fast spring return time: AFB, AFX: <20 sec @ -4°F to 122°F [-20°C to 50°C]; <60 sec @ -22°F [-30°C]
Original AF: <20 sec
Manual override is standard on all models. Provides same benefits as today’s AF series; faster installation and
easier maintenance of equipment with lock-in-place switch.
3, 10 and 16 ft cable options just like non-spring return actuator (X models only)
Built-in mechanical limit stop, a separate accessory no longer needed.

Control Dampers up to 45 sq ft
Make Up Air Units
Control Valves
Retrofit & Replacement
Tandem mount applications for higher torque

Mfr. Part No.	Description
AFB24 N4	Spring, NEMA 4, 180in-lb, On/Off, 24V
AFB24-S N4	Spring, NEMA 4, 180in-lb, On/Off, 24V, SW
AFX24 N4	Spring, NEMA 4, 180in-lb, On/Off, 24V
AFX24-S N4	Spring, NEMA 4, 180in-lb, On/Off, 24V, SW
AFBUP N4	Spring, NEMA 4, 180in-lb, On/Off, UP
AFBUP-S N4	Spring, NEMA 4, 180in-lb, On/Off, UP, SW
AFXUP N4	Spring, NEMA 4, 180in-lb, On/Off, UP
AFXUP-S N4	Spring, NEMA 4, 180in-lb, On/Off, UP, SW
AFB24-SR N4	Spring, NEMA 4, 180in-lb, 2-10V, 24V
AFB24-SR-S N4	Spring, NEMA 4, 180in-lb, 2-10V, 24V, SW
AFX24-SR N4	Spring, NEMA 4, 180in-lb, 2-10V, 24V
AFX24-SR-S N4	Spring, NEMA 4, 180in-lb, 2-10V, 24V, SW
AFB24-MFT N4	Spring, NEMA 4, 180in-lb, MFT, 24V
AFB24-MFT95 N4	Spring, NEMA 4, 180in-lb, 0-135Ω, 24V
AFB24-MFT-S N4	Spring, NEMA 4, 180in-lb, MFT, 24V, SW

Belimo AF NEMA 4 Series Spring Return Damper Actuator

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