Siemens 6ES7407-0KR02-0AA0 Power Supply Module

Siemens 6ES7407-0KR02-0AA0 is the SIMATIC S7-400 PS407 power supply module that provides a dedicated 5 V DC output at up to 10 A to feed the PLC backplane, CPU, and I/O modules in industrial automation racks. It accepts a wide AC input range and is specified for UC 120/230 V, making it suitable for global installations with 50/60 Hz supply, and it is designed for redundant use. In a redundancy setup, two PS407 10 A units can back each other to maintain the 5 V rail even during transient outages or power interruptions. Siemens notes optional backup battery support for this family of power supplies: 1× lithium AA, 3.6 V, 2.2 Ah, enabling memory retention when the main power is interrupted. As a standard, replaceable PS407 component for SIMATIC S7-400 systems, it is commonly used to power CPUs and I/O modules across automation racks, delivering a reliable and stable 5 V supply for critical PLC functions.