Siemens Building Technology GRD121.1U Actuator 320819-301 The 10-604 series is the

The 10-604 series is the manufacturer's designation

providing a tight

By replacing a failing module with this direct OEM water heater part

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

Siemens Building Technology GRD121.1U Actuator 320819-301 The 10-604 series is theThe 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