AFB24-SR-S | Belimo Modulating Spring Return Damper Actuator 20 Nm 24V

Belimo · Motors & Motion

Description  The Belimo AFB24-SR-S is a spring-return damper actuator designed for precise modulating control of HVAC air dampers requiring 20 Nm of torque. It operates on AC/DC 24 V power and integrates auxiliary switches for reliable position feedback and system interlocking.     Technical Specifications  Condition New/Never Used Surplus Brand Belimo Category Dampers & Actuators Part Number AFB24-SR-S Subcategory Damper Actuators Nominal Voltage AC/DC 24 V Nominal Frequency 50/60 Hz Voltage Range AC 19.2…28.8 V / DC 21.6…28.8 V Power Consumption (Operation) 5.5 W Power Consumption (Rest) 3 W Transformer Sizing 8.5 VA Control Signal 2…10 V (4…20 mA with external resistor) Input Impedance 100 kΩ (2…10 V), 500 Ω (4…20 mA) Position Feedback 2…10 V Torque Output 180 in-lb (20 Nm) Angle of Rotation 35…95°, adjustable Running Time (Motor) 95 s / 90° Running Time (Fail-Safe) <20 s @ -20…50°C Auxiliary Switches 2x SPDT Electrical Connection 18 AWG cables, 1 m with 1/2" NPT Noise Level 40 dB(A) motor Weight 5.7 lb (2.6 kg)   Information About AFB24-SR-S The AFB24-SR-S is part of Belimo’s AFB series of spring-return damper actuators developed for dependable airflow control in commercial HVAC systems. It features a double-insulated housing with electronic overload protection across the full operating range to maintain consistent torque and actuator integrity. The actuator supports modulating control via a 2…10 V signal and can be configured for 4…20 mA control using an external resistor, ensuring compatibility with modern building automation platforms. Adjustable mechanical end stops, selectable rotation direction, and integrated auxiliary switches provide installation flexibility and accurate damper positioning. Key Features Spring Return Fail-Safe Mechanism: Integrated spring return function drives the damper to a predefined safe position in the event of power loss, ensuring airflow safety, equipment protection, and compliance with HVAC safety requirements. 20 Nm Rated Torque Output: Provides a consistent 180 in-lb (20 Nm) torque output across the full operating range, supporting reliable actuation of medium to large air dampers under varying pressure conditions. Modulating Control Interface: Supports precise airflow modulation using a 2…10 V control signal, with optional 4…20 mA operation via external resistor, enabling seamless integration with modern building automation and DDC systems. Dual Auxiliary SPDT Switches: Equipped with two adjustable SPDT auxiliary switches that allow accurate position indication, interlocking, and sequencing with other HVAC components or control logic. Adjustable Mechanical Rotation Range: Features factory-installed mechanical end stops that allow rotation angle adjustment between 35° and 95°, supporting customized damper stroke requirements and preventing mechanical stress. Selectable Direction of Operation: Direction of motor rotation can be set via onboard switch, while the fail-safe direction is reversible through mounting orientation, simplifying installation and system configuration. Manual Override Capability: Supplied with a hex crank for manual positioning, enabling commissioning, testing, or emergency operation without electrical power. Low Noise and Protected Design: Engineered for quiet operation with low motor and spring noise levels, combined with double insulation and electronic overload protection for long-term durability. The AFB24-SR-S delivers the reliability and precision required for controlled airflow modulation and dependable fail-safe damper control in commercial HVAC systems.

Brand: Belimo · Category: Motors & Motion

Key features

• Spring Return Fail-Safe Mechanism: Integrated spring return function drives the damper to a predefined safe position in the event of power loss, ensuring airflow safety, equipment protection, and compliance with HVAC safety requirements.
• 20 Nm Rated Torque Output: Provides a consistent 180 in-lb (20 Nm) torque output across the full operating range, supporting reliable actuation of medium to large air dampers under varying pressure conditions.
• Modulating Control Interface: Supports precise airflow modulation using a 2…10 V control signal, with optional 4…20 mA operation via external resistor, enabling seamless integration with modern building automation and DDC systems.
• Dual Auxiliary SPDT Switches: Equipped with two adjustable SPDT auxiliary switches that allow accurate position indication, interlocking, and sequencing with other HVAC components or control logic.
• Adjustable Mechanical Rotation Range: Features factory-installed mechanical end stops that allow rotation angle adjustment between 35° and 95°, supporting customized damper stroke requirements and preventing mechanical stress.
• Selectable Direction of Operation: Direction of motor rotation can be set via onboard switch, while the fail-safe direction is reversible through mounting orientation, simplifying installation and system configuration.
• Manual Override Capability: Supplied with a hex crank for manual positioning, enabling commissioning, testing, or emergency operation without electrical power.
• Low Noise and Protected Design: Engineered for quiet operation with low motor and spring noise levels, combined with double insulation and electronic overload protection for long-term durability.

Specifications

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