Siemens 6ES5951-7ND31 Programmable Logic Controller Interface Module

The Siemens 6ES5951-7ND31 is a PS951 power-supply module built for the SIMATIC S5 family, specifically engineered to support the S5-115U/H programmable logic controllers. As a replacement part, it plugs into the S5-115U/H rack to deliver the 951-series supply required by the controller and its peripherals in classic industrial automation configurations. This module is part of Siemens’ 951 power-supply lineage used with older S5 systems, and it is commonly cited in repair and parts catalogs as a dedicated 951 power source for the S5-115U/H range. Designed for use within the Siemens SIMATIC S5 ecosystem, the 6ES5951-7ND31 supports the power architecture of the associated CPU and I/O modules, helping to maintain stable operation in control panels where legacy S5 components remain in service.