Belimo GKB24-SR Actuator

The Belimo GKB24-SR is a high-torque electronic fail-safe damper actuator designed for precise control in demanding HVAC systems. Engineering 360 in-lb of torque, this unit provides reliable proportional control for large dampers and valve assemblies. Operating on a 24VAC/DC power supply, it utilizes a 2-10VDC control signal to provide accurate positioning and real-time feedback signals for system monitoring. The brushless DC motor technology ensures long-term performance and synchronous motor speed, regardless of load. In the event of a power loss, the integrated supercapacitor drives the actuator to a user-defined fail-safe position, offering a modern alternative to traditional mechanical spring-return units. This direct-coupled actuator features a universal clamp for easy installation on damper shafts, reducing labor time for contractors and ensuring NEMA 2 protection in various internal environments.

Key Benefits for Technicians:

• High Torque Output: Delivers 360 in-lb (40 Nm) to handle high-static pressure applications and large damper banks.
• Electronic Fail-Safe: Uses advanced supercapacitors to provide a reliable fail position without the bulk of mechanical springs.
• Precise Modulation: Features a 2-10VDC input for smooth, proportional air flow or water flow management.
• Manual Override: Includes an external manual crank to allow for system testing and commissioning during power-down states.
• Universal Compatibility: Mounts directly to 1/2-inch to 1.05-inch round shafts or 3/8-inch to 5/8-inch square shafts.

Common Installation Questions:

What is the typical run time for the Belimo GKB24-SR?
This actuator features a motor run time of 150 seconds for 95-degree rotation, with a fail-safe position timing of less than 60 seconds.

Can I use a 4-20mA control signal with this actuator?
Yes, the Belimo GKB24-SR can accept a 4-20mA signal by installing a 500-ohm resistor across the input leads.

Does this unit support parallel wiring?
Yes, multiple non-spring return GK actuators can be wired in parallel, provided the transformer sizing accounts for a power consumption of 11 VA per unit.

This item is not eligible for free shipping.

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.