The SQM40.28RR20 is a servo motor manufactured by Siemens. It is commonly used as a damper actuator in HVAC (Heating, Ventilation, and Air Conditioning) systems to control the position of dampers and regulate air flow.

Here are some key features of the SQM40.28RR20 Siemens servo motor:

1. Application: The servo motor is designed for use in heating, ventilation, and air conditioning systems to actuate dampers and control air flow.

2. Control: It offers precise and reliable position control, allowing for accurate adjustment of damper positions based on the requirements of the HVAC system.

3. Proportional Control: The servo motor is often capable of proportional control, meaning it can adjust the damper position based on a control signal proportionate to the desired air flow or system conditions.

4. Compact Size: The SQM40.28RR20  is typically of a compact size, making it suitable for installations with limited space.

5. Long Service Life: Siemens servo motors are known for their durability and long service life. They are designed to withstand continuous operation in demanding HVAC environments.

6. Compatibility: The servo motor is designed to be compatible with Siemens control systems and other HVAC equipment, ensuring seamless integration with existing installations.