Belimo AFB24-MFT-S Spring Return Actuator 180 in-lb MFT 24V w/ Aux Switch

Description

The Belimo AFB24-MFT-S is a heavy-duty spring return damper actuator engineered for reliable, fail-safe operation in commercial and industrial HVAC applications. Delivering 180 in-lb of torque, this actuator is built to handle large damper assemblies with ease while providing precise, responsive control across multiple signal types.

Multi-Function Technology (MFT) Signal Compatibility

The AFB24-MFT-S features Belimo’s Multi-Function Technology (MFT), making it one of the most versatile actuators on the market. A single unit supports multiple control signal types, eliminating the need to stock separate models for different applications:

• 500 Ohm input impedance for 4–20 mA proportional control
• 1,500 Ohm input impedance for PWM (Pulse Width Modulation) control
• Floating point (tri-state) control
• On/Off control

Spring Return Fail-Safe Operation

The spring return mechanism ensures the damper returns to its fail-safe position upon loss of power, a critical safety feature for smoke control, ventilation, and building automation systems. This design provides peace of mind in the event of a power interruption or control signal loss.

Power Supply

• 24 Vac (50/60 Hz)
• 24 Vdc

Integrated Auxiliary Switch

The built-in auxiliary switch provides end-position feedback to the building automation or control system, enabling status monitoring, interlock functions, and system verification without the need for additional external components.

Key Specifications

• Brand: Belimo
• Model / SKU: AFB24-MFT-S
• Torque Output: 180 in-lb
• Actuator Type: Spring Return
• Control Signals: 4–20 mA (500 Ohm), PWM (1,500 Ohm), Floating Point, On/Off
• Supply Voltage: 24 Vac / 24 Vdc
• Auxiliary Switch: Included

Ideal Applications

• Large commercial damper control
• Building automation systems (BAS/BMS)
• Variable air volume (VAV) systems
• Smoke and fire/smoke damper control
• Energy management and economizer applications

The Belimo AFB24-MFT-S combines fail-safe spring return reliability with the flexibility of multi-signal MFT control, making it an ideal choice for contractors and engineers who need a single, adaptable actuator solution across a wide range of HVAC control scenarios.