Belimo SY4-24 Spring Return Damper Actuator AC/DC - 24V

The Belimo SY4-24 is a spring return rotary damper actuator designed for reliable HVAC control applications. This compact actuator operates on 24V AC/DC power and features a spring return mechanism that automatically returns the damper to its failsafe position upon power loss, ensuring system safety and proper ventilation control.

Key Features:

• 24V AC/DC universal voltage operation for flexible installation
• Spring return to 0° for failsafe operation during power failure
• 95° rotation angle for precise damper control
• 35 in-lb (4 Nm) nominal torque output
• 45-second running time for smooth, controlled actuation
• Direct mounting capability with universal mounting bracket included
• Auxiliary switch for position indication and integration with building controls
• Compact, durable housing suitable for commercial HVAC applications

The SY4-24 is ideal for controlling volume control dampers, mixing dampers, and fresh air dampers in commercial and industrial HVAC systems. Its spring return failsafe operation makes it particularly suitable for smoke control, minimum outdoor air, and other life safety applications where damper position during power loss is critical.