Configurable Damper Actuator, 45 in-lb [5 Nm], Non fail-safe, AC/DC 24 V, On/Off, Floating point, terminals

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Weight 0.62 lbs

45 in-lb [5 Nm]




AC/DC 24 V

Actuator Type

Non fail-safe

Control type


Torque motor
45 in-lb [5 Nm]
Power consumption in operation
1.5 W
Power consumption in rest position
0.2 W
Transformer sizing
2.5 VA (class 2 power source)
Ambient humidity
5...95% r.H. non-condensing
Housing material
Electrical Connection
Screw terminal (for 26 to 14 GA wire)
Manual override
external push button
Angle of rotation
Max. 95°, adjustable with mechanical stop
Position indication
reflective visual indicator (snap on)
Ambient temperature
-22...122°F [-30...50°C]
Non-operating temperature
-40...176°F [-40...80°C]
On/Off|Floating point
direction of rotation motor
reversible with built-in switch
Overload Protection
electronic throughout 0° to 95° rotation
Input Impedance
600 Ω
Degree of Protection
IP54, NEMA 1, UL Enclosure Type 1
Nominal voltage
AC/DC 24 V
Nominal voltage frequency
50/60 Hz
Power Supply
24 VAC, ±20%, 50/60 Hz, 24 VDC, ±10%
Power supply tolerance AC
Power supply tolerance DC
Agency Listing
cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EC and 2006/95/EC
Emergency control function
Non-Spring Return
Product family
Damper Actuator
Noise level, motor
<35 dB (A) 
Shaft Diameter
1/4" to 5/8" round, centers on 5/8", 3/4" clamp available
Family Series
LM Series
Running Time (Motor)
default 95 sec, variable 35, 45, 60, 150 sec, constant, independent of load
Fail-Safe function
Non fail-safe
Control type
Degree of protection IEC/EN
Degree of protection NEMA/UL
UL Enclosure Type 1
CAD ThomasNetLink
Product Features
Torque min. 45 in-lb, for control of damper surfaces up to 11 sq. ft.
The actuator is not provided with and does not require any limit switches, but is electronically protected against overload. The anti-rotation strap supplied with the actuator will prevent lateral movement. The LMB series provides 95° of rotation and a visual indicator which indicates position of the actuator. When reaching the damper or actuator end position, the actuator automatically stops. The gears can be disengaged with manual release on the actuator cover. The LMB24-3… actuators use a sensorless brushless DC motor, which is controlled by an Application Specific Integrated Circuit (ASIC). The ASIC monitors and controls the actuator’s rotation and provides a digital rotation sensing (DRS) function to prevent damage to the actuator in a stall condition. Power consumption is reduced in holding mode. The LMB24-3-S version is 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 0 to 95°. The auxiliary switch is double insulated so an electrical ground connection is not necessary. Add-on auxiliary switches or feedback potentiometers are easily fastened directly onto the actuator body for signaling and switching functions.
For On/Off and floating point control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturer’s specifications. The actuator is mounted directly to a damper shaft from 1/4” up to 5/8” in diameter by means of its standard universal clamp. Shafts up to 3/4” diameter can be accommodated by an accessory clamp.
Typical Specification
Floating point, on/off control damper actuators shall be electronic direct-coupled type, which require no crank arm and linkage and be capable of direct mounting to a shaft from 1/4” to 5/8”. Shafts up to 3/4” diameter can be accommodate with an accessory clamp. Actuators shall have brushless DC motor technology and be protected from overload at all angles of rotation. Actuators shall have reversing switch and manual override on the cover. If required, actuator will be provided with screw terminal strip for electrical connections [LMB(X)24-3-T]. If required, actuators shall be provided with one adjustable SPDT auxiliary switch. Actuators with auxiliary switches must be constructed to meet the requirements for double insulation so an electrical ground is not required to meet agency listings. Run time shall be constant and independent of torque. Actuators shall be cULus listed, have a 5-year warranty, and be manufactured under ISO 9001 International Quality Control Standards. Actuators shall be as manufactured by Belimo.
CP65 Warning
⚠ WARNING: For Belimo Products sold in California, these Products do or may contain chemicals which are known to the State of California to cause cancer and or birth defects or other reproductive harms. For more information see www.p65warnings.ca.gov.

Installation instructions Download: Installation instructions

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