Siemens 6ES7405-0DA00-0AA0 Simatic CPU Module

Siemens 6ES7405-0DA00-0AA0 is a PS 405 power supply module for the SIMATIC S7-400 family, delivering 24 V DC output with a 4 A rating to power the backplane and connected modules in an S7-400 rack. This unit corresponds to the PS 405 4 A configuration and is documented in Siemens module data for the 6ES7405-0DA00-0AA0 part number, reflecting its role within the PS 405 power supply family. Designed to mount in an S7-400 rack system, it serves as a foundational power source for CPU, I/O, and interface modules in industrial automation installations that rely on SIMATIC hardware. In legacy and retrofit contexts, this variant is commonly used to replace worn PS 405 supplies and maintain stable 24 V DC power delivery across the rack. The PS 405 family is recognized for robust performance in factory environments, and the 6ES7405-0DA00-0AA0 variant represents the standard 4 A class within that lineage, ensuring compatibility with a wide range of S7-400 configurations.