The Belimo AFXUP is a spring-return (fail-safe) damper actuator delivering 180 in-lb [20 Nm] of torque with on/off on multi-voltage (AC 24-240 V / DC 24-125 V) power. It direct-couples to damper shafts up to 1.05 in. diameter and drives to a mechanical fail-safe position on power loss, making it part of the newer, field-configurable AFX platform for commercial HVAC damper control.
Specifications sourced from the official Belimo AFXUP technical data sheet (rev 2024-12-12).
Overview
Belimo AF-Series actuators are spring-return (fail-safe) drives for commercial HVAC dampers. The AFXUP produces 180 in-lb [20 Nm] of torque, mounts directly to the damper shaft, and On loss of power the spring drives the damper to its defined fail-safe position within the rated fail-safe time. Two-position on/off control opens or closes the damper from any auxiliary contact or manual switch.
Best for
- Commercial HVAC damper control (180 in-lb damper torque)
- Fail-safe (spring return) applications requiring positive close-off
- Direct shaft mount up to 1.05 in. diameter
- Sites with mixed or unknown supply voltage (24-240 VAC)
Key Features
True Spring Return Fail-Safe
Constant-torque spring drives the damper to a defined safe position on power loss — no mechanical end switches required, and positive close-off on air-tight dampers.
180 in-lb Torque
Sizes a wide range of commercial dampers; up to two AF actuators can be piggybacked for loads to 266 in-lb on a 3/4" minimum shaft.
Simple On/Off Control
Driven open/closed from any auxiliary contact or manual switch — the workhorse choice for two-position damper control.
Multi-Voltage Power
One actuator runs on anything from AC 24-240 V or DC 24-125 V — simplifies stocking and works on diverse power sources.
Plenum-Rated & Quiet
UL 2043 plenum rated for use in air-handling spaces, double-insulated (Class 2), cULus listed and built to ISO 9001.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Belimo |
| Part Number | AFXUP |
| Actuator Type | Spring-Return (Fail-Safe) Damper Actuator |
| Nominal Voltage | AC 24-240 V / DC 24-125 V (Multi-Voltage) |
| Nominal Voltage Range | AC 19.2-264 V / DC 21.6-137.5 V |
| Nominal Frequency | 50/60 Hz |
| Power Consumption (Running) | 7 W |
| Power Consumption (Holding) | 3.5 W |
| Torque | 180 in-lb [20 Nm] |
| Control Signal | On/Off (open/close from auxiliary contact or switch) |
| Angle of Rotation | 95° (adjustable end stop 35-95°) |
| Running Time (Motor) | 75 s / 90° |
| Running Time (Fail-Safe) | <20 s @ -4 to 122°F [-20 to 50°C]; <60 s @ -22°F [-30°C] |
| Manual Override | 5 mm hex crank (3/16" Allen), supplied |
| Direction of Motion | Selectable CW/CCW |
| Position Indication | Mechanical |
| Electrical Connection | 18 AWG appliance cable, 3 ft [1 m], 1/2" NPT conduit connector |
| Overload Protection | Electronic, full 0-95° rotation |
| Electrical Protection | Double insulated (Class 2) |
| Enclosure Rating | NEMA 2 / IP54 / UL Type 2 |
| Housing Material | UL94-5VA |
| Ambient Temperature | -22 to 122°F [-30 to 50°C] |
| Storage Temperature | -40 to 176°F [-40 to 80°C] |
| Agency Listing | cULus (UL60730-1A / -2-14, CAN/CSA) |
| Quality Standard | ISO 9001 |
| Plenum Rated | UL 2043 (suitable for air plenums) |
| Weight | 4.7 lb [2.1 kg] |
| Warranty | 5 Years |
Documentation
Related Products
Accessories & Mounting
Common Belimo accessories for mounting, linkage, signaling and powering the AFXUP, drawn from the actuator datasheet. All are stocked by ZOT Supply as an authorized Belimo distributor.
Mounting & Linkage
Electrical Add-Ons
Frequently Asked Questions
What is the Belimo AFXUP?
The Belimo AFXUP is a spring-return (fail-safe) damper actuator for commercial HVAC. It produces 180 in-lb [20 Nm] of torque, uses on/off (open/close) control on AC 24 to 240 V or DC 24 to 125 V (multi-voltage) power, and drives the damper to a mechanical fail-safe position on loss of power. Its housing is rated NEMA 2 / IP54 / UL Type 2.
How does the AFXUP fail safe on power loss?
The AFXUP stores energy in a return spring during normal operation. When power is lost, the spring drives the damper to its defined safe position — no capacitors or batteries, and no mechanical end switches required. It is shipped pre-tensioned about 5° for tight shut-off on gasketed dampers.
What torque does the AFXUP provide and what shaft sizes does it fit?
It delivers 180 in-lb [20 Nm] and direct-couples to round or square damper shafts up to 1.05 in. diameter using its universal clamp. Up to two AF actuators can be piggybacked for loads to 266 in-lb on a 3/4 in. minimum shaft.
What control signal does the AFXUP use?
It uses on/off (open/close) control. On/Off is driven from any auxiliary contact, relay or manual switch.
What is the running time of the AFXUP?
Motor running time is about 75 seconds for 90° of travel, and the spring-return fail-safe time is under 15 seconds at normal temperatures (under 60 seconds at -22°F [-30°C]).
What voltage does the AFXUP run on?
The AFXUP is multi-voltage: it runs on AC 24 to 240 V or DC 24 to 125 V from one part number, so the same actuator works across line- and low-voltage systems and simplifies stocking.
What is the difference between the Belimo AFXUP and the AFBUP?
Both share the same 180 in-lb spring-return mechanics, mounting and fail-safe operation. The AFXUP is built on Belimo's newer, field-configurable AFX platform; the AFBUP is the established AFB version. For most damper applications they are interchangeable.
Is the AFXUP UL listed for damper control?
Yes. The AFXUP is cULus listed to UL60730 and CAN/CSA, is double-insulated (Class 2), and is UL 2043 plenum-rated for installation in air-handling spaces.
Is the Belimo AFXUP available from an authorized Belimo distributor?
Yes. ZOT Supply is an authorized Belimo distributor and carries the AFXUP. Every unit ships factory-new with Belimo's full 5-year warranty and application support from our team.
- Actuator Type:
- Fail-Safe
- Torque:
- 180 in-lb
- Control Signal:
- On/Off
- Voltage:
- Universal (24-240 VAC / 24-125 VDC)
- Auxiliary Switch:
- No
- Enclosure:
- NEMA 2
- Series:
- AF
