Siemens Building Technology SKD82.51U Electric/Hydraulic Actuator 24VAC 3-Position Spring Return

The Siemens Building Technology SKD82.51U is an electric/hydraulic actuator designed for HVAC damper and valve control applications. This actuator operates on 24VAC power and features 3-position control with spring return functionality, making it ideal for fail-safe operation in commercial building automation systems.

Key Features:

• 24VAC operating voltage for standard HVAC control compatibility
• 3-position control for precise modulation of dampers or valves
• Spring return (S/R) mechanism ensures fail-safe positioning during power loss
• Electric/hydraulic design provides reliable torque output
• Compact construction suitable for various installation configurations
• Compatible with Siemens building automation systems and standard control protocols

This actuator is commonly used in commercial HVAC systems for controlling mixing dampers, outdoor air dampers, and zone control valves where reliable positioning and fail-safe operation are critical requirements.