LF120-S US | Damper Actuator | 35 in-lb | Spg Rtn | 120V | On/Off | Belimo
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Brand: BelimoSKU: LF120-S US

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LF120-S US | Damper Actuator | 35 in-lb | Spg Rtn | 120V | On/Off | Belimo

Damper Actuator, 35 in-lb [4 Nm], Spring return, AC 120 V, On/Off, 1 x SPDT

Belimo | LF120-S US
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Belimo LF120-S US Documents


Details for LF120-S US

Damper Actuator | 35 in-lb | Spg Rtn | 120V | On/Off


For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. Control is On/Off from an auxiliary contact or a manual switch. The actuator is mounted directly to a damper shaft from 3/8” up to 1/2” in diameter by means of its universal clamp, 1/2” shaft centered at delivery. For shafts up to 3/4” use K6-1 accessory. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft.


The LF series actuators provide true spring return operation for reliable fail-safe application and positive close off on air tight dampers. The spring return system provides consistent torque to the damper with, and without, power applied to the actuator. The LF series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°. The actuator may be stalled anywhere in its normal rotation without the need of mechanical end switches. Power consumption is reduced in holding mode. The actuator is double insulated so an electrical ground connection is not necessary. The LF120-S US version are provided with one built-in auxiliary switch. This SPDT switch is provided for safety interfacing or signaling, for example, for fan start-up. The switching function is adjustable between 0° and 95°.


Actuator Type
Spring return
Angle of Rotation
Auxiliary Switches
1 x SPDT
Control Type
Degree of Protection
IP54 NEMA 2 UL Enclosure Type 2
Direction of Rotation (Fail-Safe)
Reversible with cw/ccw mounting
Electrical Connection
Power Consumption (Holding)
3.5 W
Power Consumption (Running)
5.5 W
Running Time (Fail-safe)
<25 s
Running Time (Motor)
75 s / 90B0
Safety Function
35 in-lb [4 Nm]
Voltage AC/DC
AC 120 V


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