Siemens S55155-A110 SSC161.05U 24V Non-Spring Return Electronic Valve Actuator

The Siemens S55155-A110 is a 24-volt electronic valve actuator designed for precise control of HVAC dampers and valves in building automation systems. This non-spring return actuator features fail-in-place functionality, maintaining its last position during power loss to ensure system stability and prevent unnecessary valve cycling.

Key Features:

• Model SSC161.05U (261 series) for reliable performance in commercial applications
• 24VAC/VDC low-voltage operation for safe integration with building control systems
• Non-spring return design with fail-in-place operation maintains valve position during power interruption
• Electronic modulating control for precise positioning and energy efficiency
• Compact design suitable for space-constrained installations
• Compatible with Siemens building automation controllers and third-party systems

This actuator is ideal for commercial HVAC applications including chilled water valves, hot water valves, and steam control valves where maintaining the current position during power failure is preferred over automatic return to a default position. The electronic control provides smooth, accurate modulation for optimal temperature and flow control.