Description
The Belimo LMB120-3 is a heavy-duty, non-spring return (NSR) direct-coupled damper actuator engineered for dependable performance in commercial and industrial HVAC applications. Designed to accept both 120V and 240V power inputs, this versatile actuator simplifies installation across a wide range of building automation and air-handling systems. With 45 in-lb of torque output, the LMB120-3 delivers the muscle needed to drive medium to large damper assemblies with precision and consistency.
The On/Off/Floating control mode provides flexible integration with virtually any building automation system (BAS) or direct digital control (DDC) platform, making it an ideal choice for new construction and retrofit projects alike. As a non-spring return actuator, the LMB120-3 holds its last commanded position upon power loss, reducing energy consumption compared to spring-return designs.
Belimo is the global leader in damper actuator technology, and the LMB120-3 reflects that heritage — built for long service life, minimal maintenance, and straightforward commissioning.
Key Features
- Dual voltage input: 120V / 240V AC
- 45 in-lb (5 Nm) torque output for medium to large dampers
- On/Off and Floating (tri-state) control modes
- Non-Spring Return (NSR) — holds last position on power loss
- Direct-coupled mounting — no crank arm or linkage required
- Suitable for use with building automation and DDC systems
- Compact, robust housing for long-term reliability
Specifications
- Brand: Belimo
- Model / SKU: LMB120-3
- Supply Voltage: 120 / 240V AC
- Torque: 45 in-lb
- Control Type: On/Off / Floating (3-point)
- Return Type: Non-Spring Return (NSR)
- Mounting: Direct-coupled
Applications
- Commercial air handling units (AHUs)
- Variable air volume (VAV) systems
- Economizer and outdoor air damper control
- Building automation and DDC integration
- Retrofit and new construction HVAC projects
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