Siemens 6EW 1890-2AC Motor Protection Relay

Siemens 6EW 1890-2AC is a main power supply unit (MPS) in the Siemens automation lineup, carrying the model number 6EW1890-2AC. In official listings it is cataloged as MPS 393769 and is intended to accompany Siemens converters such as 6SC36/37, 6SE35/36, and 6SE51/52 within control panels. As the primary DC power source for these modules, the 6EW1890-2AC helps ensure stable operation of connected drives and protection devices in industrial applications. The device belongs to Siemens' legacy 6EW power-supply family, reflecting the historical footprint and compatibility expectations of older Siemens systems. For engineers validating a replacement or integration, the exact electrical specifications—input and output voltages, current ratings, connector types, and mounting configuration—are specified in the official Siemens datasheet and in the product listing for 6EW1890-2AC. When sourcing, verify that the catalog number matches 6EW1890-2AC and that the MPS 393769 designation aligns with your system’s converter lineup to ensure proper fit and function.