Siemens Building Technology GRD121.1U Actuator 320819-301 The manual reset feature ensures

The manual reset feature ensures that technicians must physically inspect the system before restarting

designed for indoor applications where protection from dust and physical damage is required but exposure to direct water or extreme weather is not expected

The 10-604 series is the manufacturer's designation

The LH33CZ010 is the designated technical equivalent and direct replacement for the G775RGA-2

and solid particulate

Siemens Building Technology GRD121.1U Actuator 320819-301 The manual reset feature ensuresThe Siemens GRD121. 1U is a high torque 24V fire and smoke damper actuator engineered for precise 2 position control in critical life safety systems. As a veteran technician knows, reliability in smoke containment is non negotiable; this OpenAir electronic actuator delivers 30 lb in of torque to ensure positive closure against high velocity airflow. Operating on 24 VAC DC, the GRD121. 1U features a robust spring return fail safe mechanism that