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MSRP: $1,435.00
Price: $538.13
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Actuator Customization180 characters remaining
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Belimo Part: GMB24-SR
Torque min. 360 in-lb for control of damper surfaces up to 90 sq ft.
Damper Actuator for HVAC Temperature Control.
Valve Actuator for HVAC Temperature Control.

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 up to 1.05 in diameter by means of its universal clamp. A crank arm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft.
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 applications.
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 GMB(X) series provides 95 of rotation and a visual indicator indicates position of the actuator. When reaching the damper or actuator end position, the actuator automatically stops. The gears can be manually disengaged with a button on the actuator cover.
The GMB(X)24-SR actuators use a sensorless brushless DC motor, which is controlled by an Application Specific Integrated Circuit (ASIC). The ASIC monitors and controls the actuators 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.
Add-on auxiliary switches or feedback potentiometers are easily fastened directly onto the actuator body for signaling and switching functions.
Technical Attributes
Product: GMB24-SR-T N4
Torque 360 in-lb [40 Nm]
Control Input 2-10 VDC
Input Impedance 100 k for 2 to 10 VDC (0.1 mA), 500 for 4 to 20 mA
Position Feedback 2-10 VDC Feedback
Running Time (motor) 150 seconds, independent of load
Running Time (fail-safe) --
Auxiliary Switch --
Power Supply 24VAC 20%, 50/60 Hz, 24VDC 10%
Power Consumption running: 4.5 W, holding: 2.0 W
Transformer Sizing 6.5 VA (class 2 power source)
Electrical Connection screw terminal (for 26 to 14 GA wire), 1/2" conduit connector
Overload Protection electronic thoughout 0 to 95 rotation
Shaft Diameter Standard: 1/2" to 1.05" round, centers on 1/2" and 3/4" with insert, 1.05 without insert
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 100% RH (UL Type 4)
Ambient Temperature -22F to 122F [-30C to 50C]
Ambient Temperature (safety) --
Storage Temperature -40F to 176F [-40C to 80C]
Noise Level max 45 db (A)
Housing Material polycarbonate
Housing NEMA 4, IP66, UL enclosure type 4
Agency Listing cULus acc. to UL60730-1A/-2-14, CAN/CSA E60730-1, CSA C22.2 No 24-93, CE acc. to 89/336/EEC
Quality Standards ISO 9001
Weight 9.8 lbs (4.45 kg)
Item Number: GMB24-SR-T N4
Manufacturer: Belimo
Manufacturer Part No: GMB24-SR-T N4

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