LMB24: Belimo Modulating 24V

Submittal Form
SKU: Belimo LMB24 Category: Tags: , ,


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.


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 1 built-in auxiliary switch. This SPDT switch is provided for safety interfacing or signaling, for example, for fan startup. 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.

Additional information

Power Supply

24 VAC ± 20% 50/60 Hz
24 VDC ± 10%

Power Consuption

1.5 W (0.2 W)

Transformer Sizing

2.5 VA (Class 2 power source)

Electrical Connection

18 GA plenum rated cable
½” conduit connector, Protected NEMA 2 (IP54)
☐ 3 ft [1m] ☐ 10 ft [3m] ☐16 ft [5m]

Overload Protection

Electronic Throughout 0 to 95° Rotation


On/Off, Floating Point

Input Impedance

600 Ω

Angle of Rotation

Max 95°, Adjust. with Mechanical Stop


45 in-lb [5 Nm]

Direction of Rotation

Reversible with ↷/↶ Switch

Position Indication

Reflective Visual Indicator (Snap-On)

Manual Override

External Button Push

Running Time

☐ 150 ☐ 95 ☐ 60 ☐ 45 ☐ 35 seconds
Constant Independent of Load


5 to 95% RH non condensing (EN 60730-1)

Ambient Temperature

-22°F to 122°F [-30°C to 50°C]

Storage Temperature

-40°F to 176°F [-40°C to 80°C]


NEMA 2, IP54, UL enclosure type 2

Housing Material


Angency Listings†

cULus acc. to UL 60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EEC and 2006/95/E

Noise Level



Maintenance Free

Quality Standard

ISO 9001


1.1 lbs [0.5 Kg]