EFB24-SR | Belimo Modulating Spring Return Damper Actuator 270 In Lb 24V

Belimo · Motors & Motion

Description  The Belimo EFB24-SR is a high-torque spring return damper actuator delivering 270 in-lb (30 Nm) for precise modulating airflow control. It operates on AC/DC 24 V power and supports 2–10 V control with integrated position feedback and fail-safe functionality.     Technical Specifications  Condition New/Never Used Surplus Brand Belimo Category Dampers & Actuators Part Number EFB24-SR 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 Electrical Connection 18 GA cable, 1 m, 1/2" NPT Degree of Protection IP54 / NEMA 2 Noise Level 56 dB(A) motor Weight 11 lb (5.1 kg)   Information About EFB24-SR The EFB24-SR is part of Belimo’s EFB series of high-torque spring return actuators developed for demanding commercial HVAC damper applications. It features a double-insulated housing with electronic overload protection across the full 0–95° rotation range to ensure consistent torque output and long service life. The actuator supports modulating control via a 2…10 V signal and can be configured for 4…20 mA operation using an external resistor, enabling compatibility with modern building automation systems. Adjustable mechanical end stops, selectable motor direction, and reversible fail-safe action provide installation flexibility and precise damper control. Key Features Spring Return Fail-Safe Operation: Integrated spring mechanism automatically drives the damper to a defined safety position during power loss to support system protection and operational safety. High Torque Performance: Delivers a constant 270 in-lb (30 Nm) torque output suitable for large or high-pressure air damper applications. Modulating Control Interface: Accepts a 2…10 V control signal with optional 4…20 mA capability for accurate proportional airflow regulation. Electronic Overload Protection: Protects internal components throughout the full rotation range by preventing damage from mechanical obstruction or excessive load. Adjustable Rotation Range: Mechanical end stops allow precise setting of rotation limits between 35° and 95° to match damper requirements. Selectable And Reversible Operation: Motor rotation direction is selectable via onboard switch, while fail-safe direction is reversible through CW or CCW mounting. Manual Override Capability: Supplied with a hex crank to allow manual positioning during commissioning, testing, or maintenance. The EFB24-SR delivers the reliability and precision required for high-torque modulating airflow control and dependable fail-safe damper operation in HVAC systems.

Brand: Belimo · Category: Motors & Motion

Key features

• Spring Return Fail-Safe Operation: Integrated spring mechanism automatically drives the damper to a defined safety position during power loss to support system protection and operational safety.
• High Torque Performance: Delivers a constant 270 in-lb (30 Nm) torque output suitable for large or high-pressure air damper applications.
• Modulating Control Interface: Accepts a 2…10 V control signal with optional 4…20 mA capability for accurate proportional airflow regulation.
• Electronic Overload Protection: Protects internal components throughout the full rotation range by preventing damage from mechanical obstruction or excessive load.
• Adjustable Rotation Range: Mechanical end stops allow precise setting of rotation limits between 35° and 95° to match damper requirements.
• Selectable And Reversible Operation: Motor rotation direction is selectable via onboard switch, while fail-safe direction is reversible through CW or CCW mounting.
• Manual Override Capability: Supplied with a hex crank to allow manual positioning during commissioning, testing, or maintenance.

Specifications

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