EFB24-SR-S | Belimo Spring Return Damper Actuator 270 In Lb 24V With Auxiliary Switches

Belimo · Motors & Motion

Description  The Belimo EFB24-SR-S is a high-torque spring return damper actuator delivering 270 in-lb (30 Nm) for precise modulating airflow control in HVAC systems. It operates on AC/DC 24 V power and features integrated auxiliary switches for position indication and control sequencing.     Technical Specifications  Condition New/Never Used Surplus Brand Belimo Category Actuators & Dampers Part Number EFB24-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) 8 W Power Consumption (Rest) 4.5 W Transformer Sizing 14 VA Control Signal 2…10 V (4…20 mA with resistor) Input Impedance 100 kΩ (2…10 V), 500 Ω (4…20 mA) Position Feedback 2…10 V Torque Output 270 in-lb (30 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 Dual 18 GA cables, 1 m, 1/2" NPT Degree of Protection IP54 / NEMA 2 Ambient Temperature -30…50°C Weight 11 lb (5.2 kg)   Information About EFB24-SR-S The EFB24-SR-S is part of Belimo’s EFB series of spring return damper actuators designed for demanding HVAC airflow control applications. It incorporates electronic overload protection throughout the full rotation range and a double-insulated design to support safe and reliable operation. The actuator includes two factory-installed auxiliary switches to provide accurate position indication and support interlocking or safety-related control logic. Reversible fail-safe direction, selectable motor rotation, and adjustable mechanical end stops offer flexibility during installation and commissioning. Key Features Spring Return Fail-Safe Operation: Integrated spring mechanism ensures automatic return to a predefined safety position during power loss for reliable system protection. High Torque Performance: Delivers a constant 270 in-lb (30 Nm) torque suitable for large or high-pressure air damper applications. Modulating Control Capability: Accepts a 2…10 V control signal with optional 4…20 mA configuration for precise proportional airflow regulation. Dual Auxiliary SPDT Switches: Includes two adjustable switches for damper position indication, sequencing, and safety interlocks. Electronic Overload Protection: Protects internal components throughout the full 0…95° rotation range against mechanical obstruction or overload. Manual Override Function: Supplied hex crank allows manual damper positioning during commissioning, testing, or maintenance. Adjustable Mechanical End Stops: Enable precise limitation of rotation angle to match damper requirements. The EFB24-SR-S delivers the reliability and precision required for modulating airflow control with dependable fail-safe operation in HVAC systems.

Brand: Belimo · Category: Motors & Motion

Key features

• Spring Return Fail-Safe Operation: Integrated spring mechanism ensures automatic return to a predefined safety position during power loss for reliable system protection.
• High Torque Performance: Delivers a constant 270 in-lb (30 Nm) torque suitable for large or high-pressure air damper applications.
• Modulating Control Capability: Accepts a 2…10 V control signal with optional 4…20 mA configuration for precise proportional airflow regulation.
• Dual Auxiliary SPDT Switches: Includes two adjustable switches for damper position indication, sequencing, and safety interlocks.
• Electronic Overload Protection: Protects internal components throughout the full 0…95° rotation range against mechanical obstruction or overload.
• Manual Override Function: Supplied hex crank allows manual damper positioning during commissioning, testing, or maintenance.
• Adjustable Mechanical End Stops: Enable precise limitation of rotation angle to match damper requirements.

Specifications

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