NFB24-SR-S | Belimo Spring Return Damper Actuator 90 In Lb 24VACDC Modulating

Belimo · Motors & Motion

Description  The Belimo NFB24-SR-S is a spring return damper actuator designed for precise modulating airflow control using a 24 VAC/DC power supply. Delivering 90 in-lb torque and supporting 2–10 V control, it integrates auxiliary switching for accurate positioning and dependable fail-safe operation.     Technical Specifications  Condition New/Never Used Surplus Brand Belimo Category Damper Actuators Part Number NFB24-SR-S Subcategory Spring Return Damper Actuators Actuator Type Damper Actuator Control Type Modulating Control Signal 2…10 V (4…20 mA with resistor) 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 Torque Output 90 in-lb (10 Nm) Spring Return Yes Power Consumption (Operation) 3.5 W Power Consumption (Rest) 2.5 W Transformer Sizing 6 VA Auxiliary Switches 2 × SPDT Position Feedback 2…10 V Angle of Rotation 35…95°, adjustable Running Time 95 s / 90° Protection Rating NEMA 2 Electrical Connection Dual 18 AWG cables, 1 m, 1/2" NPT Weight 4.9 lb (2.2 kg)   Information About NFB24-SR-S The NFB24-SR-S is part of Belimo’s compact spring return damper actuator range developed for controlled modulating airflow applications in commercial HVAC systems. It combines proportional control capability with integrated auxiliary switches, allowing precise position signaling and system interlocking. The actuator incorporates electronic overload protection and a robust spring return mechanism that ensures rapid movement to a defined safety position during power loss. Designed for flexible installation, it supports adjustable rotation limits and reversible fail-safe direction to suit various damper configurations. Key Features 90 in-lb (10 Nm) Torque Output: Provides reliable mechanical force for accurate positioning of medium-sized HVAC dampers under varying load conditions. Spring Return Fail-Safe Function: Automatically drives the damper to a predetermined safety position when control power is interrupted. Modulating Control Input: Accepts 2–10 V control signals, with optional 4–20 mA operation, enabling smooth proportional airflow regulation. Dual SPDT Auxiliary Switches: Two independently adjustable switches support precise position indication, interlocking, or safety monitoring functions. Position Feedback Output: Supplies a 2–10 V feedback signal for real-time verification of damper position within the control system. Adjustable Mechanical End Stops: Allow the rotation range to be set between 35° and 95° to match specific application requirements. Manual Override Capability: Includes a hex crank for manual positioning during commissioning, testing, or maintenance. The NFB24-SR-S delivers the reliability and precision required for modulating spring return damper control in commercial HVAC airflow management and safety-critical applications.

Brand: Belimo · Category: Motors & Motion

Key features

• 90 in-lb (10 Nm) Torque Output: Provides reliable mechanical force for accurate positioning of medium-sized HVAC dampers under varying load conditions.
• Spring Return Fail-Safe Function: Automatically drives the damper to a predetermined safety position when control power is interrupted.
• Modulating Control Input: Accepts 2–10 V control signals, with optional 4–20 mA operation, enabling smooth proportional airflow regulation.
• Dual SPDT Auxiliary Switches: Two independently adjustable switches support precise position indication, interlocking, or safety monitoring functions.
• Position Feedback Output: Supplies a 2–10 V feedback signal for real-time verification of damper position within the control system.
• Adjustable Mechanical End Stops: Allow the rotation range to be set between 35° and 95° to match specific application requirements.
• Manual Override Capability: Includes a hex crank for manual positioning during commissioning, testing, or maintenance.

Specifications

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