Siemens 6AG1961-3BA21-7AX0 PS E202U Redundancy Module

Siemens SIPLUS PS E202U redundancy module, 6AG1961-3BA21-7AX0, is a 24 V DC redundancy interface for SITOP power supplies. The module is based on the 6EP1961-3BA21 design and features conformal coating with an extended temperature range of -40 to +70 °C to withstand harsh industrial environments. It provides 24 V DC input/output with a total current capacity of 40 A, configured to decouple two SITOP power supplies with a maximum of 20 A per supply, enabling safe switchover and isolation in the event of a single supply fault. This makes it suitable for critical control circuits and automation racks that require reliable 24 V power, such as PLCs, I/O modules, and sensors connected to SITOP supplies. The SIPLUS variant is designed for deployments where environmental tolerance is important, combining robust protection with the standard SITOP PSE202U redundancy functionality. The 6AG1961-3BA21-7AX0 designation identifies this device as the SIPLUS PS E202U redundancy module version, ensuring compatibility with SITOP power supplies and preserving a shared 24 V load bus while providing redundant supply capability for safer operation in demanding applications.