{"product_id":"lf24-sr-s-us-belimo-modulating-spring-return-damper-actuator-35-in-lb-24v","title":"LF24-SR-S US | Belimo Modulating Spring Return Damper Actuator 35 In Lb 24V","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cp data-start=\"122\" data-end=\"397\"\u003eThe Belimo LF24-SR-S US is a compact spring return damper actuator providing 35 in-lb (4 Nm) of torque for precise modulating airflow control. It operates on AC\/DC 24 V power and supports 2–10 V control with integrated auxiliary switching and position feedback.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003cp class=\"\" data-end=\"574\" data-start=\"284\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable style=\"width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eBelimo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eDampers \u0026amp; Actuators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eLF24-SR-S US\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eDamper Actuators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eAC\/DC 24 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eNominal Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e50\/60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eVoltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eAC 19.2…28.8 V \/ DC 21.6…28.8 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003ePower Consumption (Operation)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e2.5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003ePower Consumption (Rest)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e1 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eTransformer Sizing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e5 VA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eControl Signal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e2…10 V (4…20 mA with resistor)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e100 kΩ (2…10 V), 500 Ω (4…20 mA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003ePosition Feedback\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e2…10 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eTorque Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e35 in-lb (4 Nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eAngle of Rotation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eMax. 95°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eRunning Time (Motor)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e150 s \/ 90°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eRunning Time (Fail-Safe)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e\u0026lt;25 s\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eAuxiliary Switch\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e1x SPDT, adjustable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eElectrical Connection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e18 AWG cables, 1 m, 1\/2\" NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eDegree of Protection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003eNEMA 2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eAmbient Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e-30…50°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eNoise Level\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e30 dB(A) motor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 29.4729%;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 70.1635%;\"\u003e3.3 lb (1.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cbr\u003e\u003c\/h4\u003e\n\u003ch4\u003eInformation About\u003cspan data-sheets-root=\"1\"\u003e LF24-SR-S US\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003eThe LF24-SR-S US is part of Belimo’s LF series of low-torque spring return actuators engineered for accurate control of small air dampers in HVAC systems. It features a double-insulated design with electronic overload protection throughout the full rotation range to maintain consistent performance and actuator longevity. The actuator supports modulating control via a 2…10 V signal and can be configured for 4…20 mA operation using an external resistor, ensuring compatibility with modern control platforms. Reversible fail-safe direction, selectable motor rotation, and an adjustable auxiliary switch provide installation flexibility and dependable system integration.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpring Return Fail-Safe Operation: Integrated spring mechanism automatically drives the damper to a defined safety position during power loss, supporting airflow safety and system protection.\u003c\/li\u003e\n\u003cli\u003eLow Torque Precision Control: Delivers a constant 35 in-lb (4 Nm) torque output for accurate positioning of small and lightweight dampers.\u003c\/li\u003e\n\u003cli\u003eModulating Control Interface: Accepts a 2…10 V control signal with optional 4…20 mA capability, allowing precise proportional airflow regulation.\u003c\/li\u003e\n\u003cli\u003eIntegrated Auxiliary Switch: Includes one adjustable SPDT switch for position indication, interlocking, or control sequencing tasks.\u003c\/li\u003e\n\u003cli\u003eElectronic Overload Protection: Protects internal components across the full 0…95° rotation range by preventing damage from mechanical obstruction.\u003c\/li\u003e\n\u003cli\u003eReversible Operation Configuration: Motor direction is selectable via onboard switch, while fail-safe direction can be changed through CW or CCW mounting.\u003c\/li\u003e\n\u003cli\u003eQuiet and Efficient Design: Engineered for low noise motor operation and minimal power consumption in continuously controlled HVAC environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe LF24-SR-S US delivers the reliability and precision required for modulating airflow control and dependable fail-safe damper positioning in HVAC applications.\u003c\/p\u003e","brand":"Belimo","offers":[{"title":"Default Title","offer_id":51047971651882,"sku":"LF24-SR-S US","price":399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/7824.jpg?v=1768221382","url":"https:\/\/iqelectro.com\/products\/lf24-sr-s-us-belimo-modulating-spring-return-damper-actuator-35-in-lb-24v","provider":"IQElectro","version":"1.0","type":"link"}