Belimo LF24-S Actuator Motor

The Belimo LF24-S Actuator is a spring return actuator engineered for reliable on/off control in HVAC damper and control valve applications. Operating on 24VAC or 24VDC, this unit delivers a torque output of 35 in-lb (4 Nm), providing safe-positioning during power loss. This model features an integrated SPDT auxiliary switch (fixed at 10°), enabling precise feedback or signaling for auxiliary equipment. It serves as a direct footprint and functional replacement for the MA-7103-500, ensuring seamless integration into legacy systems. Designed for longevity in demanding environments, the LF24-S utilizes a brushless DC motor controlled by an ASIC to prevent stall conditions and optimize energy consumption. The mechanical fail-safe mechanism ensures the damper or valve returns to its original position upon power interruption, a critical requirement for fire and smoke safety or freeze protection sequences. Its universal clamp design accommodates round shafts up to 5/8" and square shafts up to 1/2".

• Fail-Safe Reliability: True spring return functionality ensures 100% closure or opening during power outages.
• Direct Replacement: Fully compatible with MA-7103-500 specifications for rapid field retrofits.
• Integrated Monitoring: The auxiliary switch provides dry contact feedback without needing additional external components.
• Versatile Powering: Accepts both 24V AC/DC inputs, reducing the need for multiple inventory variants.

Common Questions

Is the Belimo LF24-S suitable for modulating control?
No, the LF24-S is designed for on/off control. For modulating 2-10VDC or 4-20mA applications, the LF24-SR model is required.

What is the purpose of the auxiliary switch on this motor?
The built-in auxiliary switch (S-model) is typically used for end-stop verification, interlock control for fans, or status reporting to a Building Automation System (BAS).

Can I manually override the spring return position?
Yes, the actuator can be manually cranked and locked into position for testing or installation, though it will reset once electrical power is applied.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.