The Siemens part number 6SE6440-2UD21-5AA1 corresponds to the Micromaster 440 Variable Frequency Drive (VFD). The Micromaster 440 is a compact and versatile drive used for controlling the speed and torque of AC motors in various industrial applications.

Here are some key features and specifications of the 6SE6440-2UD21-5AA1 VFD:

Power Rating: The VFD is designed to control motors with a power rating of up to 11 kW (15 HP) for typical three-phase applications.

Input Voltage: The VFD operates with an input voltage range of 380-480V AC, 3-phase.

Control Modes: The Micromaster 440 supports various control modes, including V/f control (scalar control) and vector control (sensorless or with encoder feedback).

Communication Interfaces: The VFD offers communication interfaces such as Profibus, Modbus RTU, or USS protocol, allowing integration with PLC systems and other industrial networks.

Protection Features: The Micromaster 440 provides built-in motor and drive protection features, including overload protection, short circuit protection, and temperature monitoring.

Keypad and Display: The VFD includes an integrated keypad and a display panel for convenient parameter configuration and monitoring.

Application-Specific Functions: The Micromaster 440 offers various application-specific functions such as PID control, pump control, and flying restart, which enhance its versatility in different industrial environments.

The 6SE6440-2UD21-5AA1 VFD is widely used in automation systems for controlling motor speed and achieving energy-efficient operation.