Siemens Building Technology GBB166.1U NSR Electric Damper Actuator W/Dual Auxiliary 24 VAC 0-10 VDC

The Siemens Building Technology GBB166.1U NSR Electric Damper Actuator is a non-spring return rotary actuator used for modulating control of air dampers in ventilation and air handling assemblies. It operates on a 24 VAC supply and accepts a 010 VDC control signal for precise proportional positioning, allowing smooth adjustment of damper angle based on system demand. The dual auxiliary switch configuration provides additional feedback or interlocking capability within control circuits. This actuator is commonly used in HVAC system zoning, mixing, and exhaust applications to coordinate airflow regulation and maintain controlled damper positioning across connected air distribution sections.