Belimo LMB24-SR Motor Actuator

The Belimo LMB24-SR is an industrial-grade rotary motor actuator engineered for precise proportional control in HVAC systems. Delivering 45 in-lb (5 Nm) of torque, this 24V damper actuator is the reliable choice for modulating air flow in ventilation and building automation setups. It operates on a universal 24 VAC/VDC power supply and accepts a standard 2-10 VDC control signal for accurate positioning. This model serves as the direct replacement for ACT0482, though technicians should note that it does not include an OEM plug and requires standard field wiring. Built with a NEMA 2 / UL Type 2 enclosure, the LMB24-SR features a brush-less DC motor for constant torque and a 95-second run time. A manual override button and a selectable direction-of-rotation switch come standard, facilitating rapid troubleshooting and commissioning on the job site.

Key Benefits for Contractors

• Universal Compatibility: Works seamlessly with 2-10 VDC modulation or 4-20 mA signals (with a 500? resistor) for diverse HVAC damper control requirements.
• High Efficiency: Extremely low power consumption—only 1.5W while running and 0.4W in holding mode—reduces transformer sizing requirements.
• Reliable Replacement: Specifically designed to replace the Trane ACT0482 and other legacy 45 in-lb actuators in the field.
• Durability: Engineered for over 100,000 cycles, ensuring long-term performance in demanding commercial environments.
• Simple Commissioning: Includes an external push-button manual override and a 0/1 direction switch for easy mechanical alignment.

Common Questions

Does the LMB24-SR include the electrical plug found on OEM units?
No, this version is the standard professional model and does not come with an OEM-specific plug. It is designed for direct wiring into the terminal strip or junction box.

Can this actuator be used in 4-20 mA control loops?
Yes, by adding a 500? resistor across the input terminals, the Belimo LMB24-SR can effectively process 4-20 mA control signals.

Is this model fail-safe (spring return)?
No, the LMB24-SR is a non-spring return actuator. It maintains its last position upon loss of power. For applications requiring a safety return, look for the Belimo LF or NF series.

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.