Siemens 6ES5951-7ND51 Programmable Logic Controller Module

SiemenS 6ES5951-7ND51 is a SIMATIC S5 spare-part power supply unit designed for the S5-115U/H PLC family, providing a 24 V DC input and a 5 V DC output to power the S5 logic circuitry with a current rating of 7 A in standard operation (up to 15 A when cooled by a fan), and it is shipped without a backup battery. This module weighs about 1.655 kg and ships with packaging dimensions around 21.30 x 31.30 x 7.30 cm, reflecting a compact cabinet-mountable component for retrofits or repairs in older Siemens systems. It is a discontinued product (end of product lifecycle since October 1, 2022) originating from Austria and is not RoHS-compliant, categorized as a spare part for the S5-115U/H PLC. Typically used to power the S5 control logic in legacy installations, the 6ES5951-7ND51 serves as the primary 951 power supply in projects where Siemens S5 hardware remains in service.