Description
The Belimo LF120 US is a spring return damper actuator designed for reliable on/off control of HVAC air dampers using a wide-range AC power supply. Delivering 35 in-lb torque, it supports dependable airflow control with automatic fail-safe positioning during power loss.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Damper Actuators |
| Part Number |
LF120 US |
| Subcategory |
Spring Return Damper Actuators |
| Actuator Type |
Damper Actuator |
| Control Type |
On/Off |
| Nominal Voltage |
AC 100…240 V |
| Nominal Frequency |
50/60 Hz |
| Voltage Range |
AC 85…264 V |
| Torque Output |
35 in-lb (4 Nm) |
| Spring Return |
Yes |
| Power Consumption (Operation) |
3.5 W |
| Power Consumption (Rest) |
2 W |
| Transformer Sizing |
6.5 VA |
| Angle of Rotation |
Max. 95° |
| Running Time |
75 s / 90° |
| Electrical Connection |
18 GA cable, 1 m, 1/2" NPT |
| Protection Rating |
IP54, NEMA 2 |
| Ambient Temperature |
-22…122°F (-30…50°C) |
| Weight |
8.3 lb (3.7 kg) |
Information About LF120 US
The LF120 US is part of Belimo’s spring return damper actuator series engineered for dependable airflow control in commercial HVAC systems. It operates on a universal AC voltage range, allowing direct connection to line-voltage power without the need for external transformers. The actuator incorporates electronic overload protection and double insulation to support safe, maintenance-free operation over its full rotation range. Designed for flexible installation, it supports reversible fail-safe direction and complies with UL and plenum-rated installation requirements.
Key Features
- 35 in-lb Torque Output: Provides consistent mechanical force for reliable operation of small to medium-sized HVAC air dampers.
- Spring Return Fail-Safe Operation: Automatically drives the damper to a predefined safety position when power is interrupted.
- Wide AC Voltage Range: Supports direct connection to 100–240 VAC systems, simplifying electrical design and installation.
- On/Off Control Functionality: Enables straightforward binary damper control for ventilation, exhaust, and zoning applications.
- Electronic Overload Protection: Protects internal components throughout the full 0–95° rotation range to extend service life.
- Reversible Mounting Orientation: Allows clockwise or counterclockwise fail-safe action through mounting configuration and selector switch.
- Plenum-Rated and Certified Design: Complies with UL 2043 and applicable standards for installation in air-handling spaces.
The LF120 US delivers the reliability and precision required for safe, long-term spring return damper control in commercial HVAC airflow management applications.
