Belimo GMB24-SR Actuator

The Belimo GMB24-SR is a high-torque, non-spring return damper actuator engineered for precise proportional modulation in large-scale HVAC systems. Delivering a robust 360 in-lb torque, this unit is designed to automate dampers up to 90 square feet. It operates on a universal 24VAC/DC power supply and accepts a standard 2-10VDC control signal, which can be adapted for 4-20mA signals using a 500? resistor. As the direct replacement for GM24-SR, the GMB24-SR offers seamless integration into existing building automation systems without the need for additional linkages. The brushless DC motor technology ensures constant run times of 150 seconds and includes electronic overload protection throughout its 95-degree rotation. For field commissioning, a manual override button allows for quick gear disengagement, while the 2-10VDC feedback signal provides accurate position tracking for 100% system transparency.

• Universal Compatibility: Serves as the official replacement for Belimo GM24-SR, ensuring drop-in compatibility for legacy damper shafts.
• High Torque Output: Provides 360 in-lb (40 Nm) of force, suitable for heavy-duty industrial and commercial dampers.
• Advanced Motor Control: Features a sensorless brushless DC motor for maintenance-free operation and energy efficiency in holding mode.
• Precise Modulation: Supports 2-10VDC proportional control for granular air volume adjustments.
• Field Reliability: Rated NEMA 2 (IP54) with an integrated 3-foot plenum cable for standard HVAC installations.

Is the Belimo GMB24-SR a fail-safe actuator?
No, this is a non-spring return actuator. It will maintain its last position upon loss of power rather than returning to a "fail-open" or "fail-closed" state.

Can I use this for 4-20mA control applications?
Yes. By adding an external 500? resistor (model ZG-R01), the 2-10VDC input can be converted to accept a 4-20mA command signal.

What size damper shaft does the universal clamp support?
The standard K-GM20 clamp accommodates round shafts from 1/2" to 1.05" and square shafts from 13/32" to 3/4".

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.