Description
The Belimo LF120-S US is a compact spring return damper actuator delivering 35 in-lb of torque for reliable on/off airflow control. It operates on a wide AC voltage range and provides dependable fail-safe positioning for HVAC damper applications.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Actuators & Dampers |
| Part Number |
LF120-S US |
| Subcategory |
Damper Actuators |
| Actuator Type |
Spring return, on/off |
| Nominal Torque |
35 in-lb (4 Nm) |
| Nominal Voltage |
AC 100…240 V |
| Nominal Frequency |
50/60 Hz |
| Voltage Range |
AC 85…264 V |
| Power Consumption (Running) |
3.5 W |
| Power Consumption (Rest) |
2 W |
| Transformer Sizing |
6.5 VA |
| Auxiliary Switch |
1 × SPDT, adjustable 0…95° |
| Angle of Rotation |
Max. 95° |
| Running Time |
75 s / 90° |
| Fail-Safe Running Time |
<25 s |
| Electrical Connection |
Two 18 GA cables, 3 ft, 1/2" NPT |
| Degree of Protection |
IP54 / NEMA 2 / UL Type 2 |
| Ambient Temperature |
-22…122°F (-30…50°C) |
| Housing Material |
Galvanized steel |
| Weight |
3.6 lb (1.6 kg) |
Information About LF120-S US
The LF120-S US is part of Belimo’s compact spring return damper actuator range engineered for dependable on/off control in HVAC air distribution systems. It features a wide-range AC power supply, allowing direct connection to 120 V and other line-voltage control circuits without additional transformers. The actuator incorporates a mechanical spring return to drive the damper to a defined safety position during power loss, with reversible fail-safe direction through CW/CCW mounting. Its double-insulated construction, electronic overload protection, and maintenance-free design support long-term, reliable operation.
Key Features
- Spring Return Fail-Safe Operation: Integrated spring mechanism automatically drives the damper to a predefined safety position when power is lost.
- Wide AC Line Voltage Input: Operates from AC 100…240 V, simplifying installation in line-voltage HVAC control systems.
- Reliable On Off Control Function: Designed for straightforward open and close damper operation with consistent response.
- Integrated Auxiliary Switch: One adjustable SPDT switch provides end-position indication or interlock signaling for system coordination.
- Configurable Direction Of Motion: Motor direction selectable by switch, with fail-safe direction reversible through CW/CCW mounting.
- Durable Mechanical Construction: Galvanized steel housing and double-insulated electronics enhance durability and safety.
- Maintenance-Free Performance: Electronic overload protection and sealed design support continuous operation without routine servicing.
The LF120-S US delivers the reliability and precision required for safe, dependable on/off damper control in commercial HVAC installations.
