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MSRP: $313.00
Price: $117.38
You Save: $195.62 (62 %)


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Belimo Part Number: LMB24-SR

Proportional Control, Non-Spring Return, 24 VAC or DC power, 2 to 10 VDC or 4 to 20 mA control signal


For proportional modulation of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturers specifications. The actuator is mounted directly to a damper shaft from 1/4 up to 5/8 in diameter by means of its universal clamp. Shafts up to 3/4 diameter can be accommodated by an accessory clamp.

The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500 resistor, a 4 to 20 mA control input from an electronic controller or positioner.  A 2 to 10 VDC feedback signal is provided for position indication or master-slave

Technical Data Sheet

Fail-Safe Non-Spring Return
Torque 45 in-lb [5 Nm]
Control Input On/Off
Input Impedance 100 k for 2 to 10 VDC (0.1 mA), 500 for 4 to 20 mA
Position Feedback 2 to 10 VDC, 0.5 mA max
Running Time (motor) 95 seconds constant, independent of load
Running Time (fail-safe) --
Auxiliary Switch --
Power Supply 24 VAC ± 20%, 50/60 Hz, 24 VDC ± 10%
Power Consumption 1.5 W,0.4 W
Transformer Sizing 3 VA (class 2 power source)
Electrical Connection 18 GA plenum rated cable with 1/2" conduit connector protected NEMA 2 (IP54) 3ft [1m] 10 ft [3m] and 16 ft [5m]
Overload Protection electronic throughout 0 to 95° rotation
Shaft Diameter Standard: 1/4" to 5/8" round, centers on 5/8", 3/4" clamp available
Angle of Rotation max. 95°, adjustable with mechanical stop
Direction of Rotation (motor) reversible with switch
Direction of Rotation (fail-safe) --
Position Indication reflective visual indicator (snap on)
Manual Override external push button
Humidity 5 to 95% RH non condensing (EN 60730-1)
Ambient Temperature -22°F to +122°F [-30°C to +50°C]
Ambient Temperature (safety) --
Storage Temperature -40°F to +176°F [-40°C to +80°C]
Noise Level <35 dB (A)
Housing Material UL94-5VA
Housing NEMA 2, IP54, UL enclosure type 2
Agency Listing cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1:02, CE acc. to 2004/108/EEC and 2006/95/EC
Quality Standards ISO 9001
Weight 1.7 lbs (0.5 kg)

Item Number: LMB24-SR
Manufacturer: Belimo
Manufacturer Part No: LMB24-SR

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