Belimo LM24A-SR/300 Modulating Damper Actuator – 3m Cable, 24V The Belimo LM24A-SR/300 is a high-performance modulating damper actuator designed for reliable and precise control in HVAC systems. Unlike standard models, this unit is made-to-order and supplied with an extended 3-metre connection cable, offering additional flexibility during installation. Please note that this actuator has a two-week lead time due to its non-standard configuration. Engineered for durability and accuracy, the LM24A-SR/300 is particularly suitable for air dampers up to 1 m² in size. By delivering smooth modulating control, it ensures efficient airflow regulation, contributing to energy savings, enhanced comfort, and stable building performance. Key Features of the Belimo LM24A-SR/300 Made-to-order actuator with a 3-metre cable for extended installation reach. Modulating control 0…10 V for precise damper positioning. Position feedback 2…10 V for real-time monitoring and integration. 5 Nm torque output suitable for dampers up to 1 m². Two-week lead time ensures tailored supply of this non-standard model. Manual override with push-button for straightforward system testing and commissioning. Compact and lightweight design for easy installation in restricted spaces. Maintenance-free operation with integrated overload protection. Technical Data Electrical Data Nominal Voltage: AC/DC 24 V Voltage Range: 19.2…28.8 V Frequency: 50/60 Hz Power Consumption (Operation): 2 W Power Consumption (Rest): 0.4 W Power Consumption (Wire Sizing): 4 VA Connection Supply/Control: 3 m cable, 4 x 0.75 mm² Parallel Operation: Supported (observe performance limits) Functional Data Torque Motor: 5 Nm Operating Range (Y): 2…10 V Input Impedance: 100 kΩ Position Feedback (U): 2…10 V (max. 1 mA) Position Accuracy: ±5% Running Time Motor: 150 s / 90° Sound Power Level: 35 dB(A) Manual Override: Push-button, lockable Angle of Rotation: Max. 95°, adjustable with mechanical end stops Position Indication: Mechanical, pluggable Safety Data Protection Class: IEC/EN III (SELV) Degree of Protection: IP54 UL Power Source: Class 2 supply EMC: CE according to 2014/30/EU Certification: IEC/EN 60730-1 and IEC/EN 60730-2-14 UL Approval: cULus according to UL60730-1A and UL60730-2-14, CAN/CSA E60730-1 Rated Impulse Voltage: 0.8 kV Pollution Degree: 3 Environmental Data Ambient Temperature: -30…50°C Storage Temperature: -40…80°C Ambient Humidity: 95% RH, non-condensing Servicing: Maintenance-free Weight: Approx. 0.75 kg Product Benefits Extended Cable for Installation Flexibility The LM24A-SR/300 is supplied with a 3-metre cable instead of the standard 1-metre option. This makes it ideal for projects where actuators need to be mounted at a distance from the control box or where routing restrictions apply. Precise Modulating Control With its 0…10 V input signal, the actuator allows continuous adjustment of damper positions. Unlike basic open/close actuators, the LM24A-SR/300 enables precise airflow regulation, improving overall system efficiency and indoor climate control. Compact and Reliable Design The actuator’s small footprint makes it suitable for installations where space is limited, such as ceiling voids or compact air-handling units. The 5 Nm torque rating ensures sufficient force for dampers up to 1 m², covering a wide range of standard HVAC applications. Ease of Use and Commissioning The manual override push-button allows engineers to manually adjust the actuator during commissioning or maintenance. This feature ensures quick system checks without requiring signal input. Mechanical end stops also allow adjustment of the rotation angle, further increasing flexibility. Long Service Life As with all Belimo products, the LM24A-SR/300 is built for maintenance-free operation. Integrated overload protection eliminates the need for limit switches, reducing wear and extending actuator life. Applications The Belimo LM24A-SR/300 actuator is widely used in commercial, residential, and industrial HVAC systems. Typical applications include: Air handling units requiring precise airflow control. Variable air volume systems where modulating dampers balance airflow. Ventilation and duct systems in offices, schools, and healthcare buildings. Energy-efficient retrofits requiring accurate damper regulation. By using this actuator, facilities managers and engineers can ensure reliable damper operation, improved air distribution, and reduced energy consumption. Accessories A range of accessories is available for the LM24A-SR/300, including: Auxiliary switches for additional control functions. Feedback potentiometers for customised position output signals. Mounting kits and mechanical accessories to adapt installation requirements. These options make the actuator adaptable to various control strategies and system designs. Installation and Electrical Setup The actuator is designed for direct mounting on the damper shaft, secured with a universal shaft clamp. The included anti-rotation mechanism ensures a stable installation. The 3-metre cable simplifies connection where the standard 1-metre cable is not sufficient. Electrical installation requires supply from an isolating transformer. Parallel connection with other actuators is supported, provided that the overall performance limitations are respected. Why Choose the Belimo LM24A-SR/300? Supplied with a 3 m extended cable for added flexibility. Designed for air dampers up to 1 m² with 5 Nm torque. Modulating control improves energy efficiency and indoor comfort. Maintenance-free with overload protection and no external limit switches required. Compact size allows installation in restricted spaces. Backed by Belimo’s reputation for precision and reliability. Order with Confidence We supply only genuine Belimo products, ensuring full manufacturer quality and reliability. This LM24A-SR/300 is made-to-order and includes a two-week lead time. Free UK delivery is included, and our support team is available to assist with technical queries or project pricing. Related Products Belimo LM24A-SR – Standard model with 1 m cable Belimo NM24A-SR – 8 Nm actuator for larger dampers Belimo SM24A-SR – 20 Nm actuator for larger systems About Us At Eco Spares, we specialise in supplying HVAC spare parts and building automation components across the UK. All our products are sourced directly from trusted manufacturers, ensuring authenticity and performance. For biomass boiler servicing, repairs, and renewable energy solutions, visit our sister company: tisigo.co.uk Resources Click here to view the full technical data PDF
