{"product_id":"siemens-6es5-955-5nb11-simatic-s5-power-supply-unit","title":"Siemens 6ES5955-5NB11 Simatic S5 Power Supply Unit","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Siemens 6ES5955-5NB11 is a high-performance power supply unit engineered for the Siemens Simatic S5-135 and S5-155 controller families. This module provides critical power conversion for the 186U configuration, transforming input power into stable 24 VDC and 5 VDC outputs with a total capacity of 15 A. Designed for mission-critical industrial environments such as chemical processing, heavy metallurgy, and automated manufacturing, this unit ensures stable voltage regulation under fluctuating load conditions. By maintaining precise power delivery to the CPU and I\/O racks, the 6ES5955-5NB11 minimizes electrical noise and prevents system resets, serving as a vital link in reducing unplanned downtime in legacy automation infrastructures.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDesigned specifically for Simatic S5-135 and S5-155 controller systems.\u003c\/li\u003e\n\u003cli\u003eProvides dual voltage rails: 24 VDC and 5 VDC.\u003c\/li\u003e\n\u003cli\u003eHigh-efficiency switched-mode power architecture.\u003c\/li\u003e\n\u003cli\u003eTotal current capacity of 15 A to support expanded I\/O and CPU racks.\u003c\/li\u003e\n\u003cli\u003eHeavy-duty industrial housing for enhanced electromagnetic interference (EMI) protection.\u003c\/li\u003e\n\u003cli\u003eOptimized for rack-mounting in standard Siemens cabinets.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis power supply is intended for use in legacy Simatic S5 automation environments, including large-scale process control, heavy industrial manufacturing, and metallurgical plants where high-density rack configurations require reliable, isolated DC power distribution.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable border=\"1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e6ES5955-5NB11\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSiemens Simatic S5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd\u003e24 VDC \/ 5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Current Capacity\u003c\/td\u003e\n\u003ctd\u003e15 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 degC to 60 degC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure Type\u003c\/td\u003e\n\u003ctd\u003eIndustrial Rack-Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the system power is completely disconnected before installing or removing the power supply module.\u003c\/li\u003e\n\u003cli\u003eVerify that the backplane is clear of debris and that the module is correctly seated in the designated rack slot.\u003c\/li\u003e\n\u003cli\u003eEnsure adequate ventilation around the unit to maintain operating temperatures within the 0 degC to 60 degC range.\u003c\/li\u003e\n\u003cli\u003eUse appropriate shielded cabling for all I\/O connections to minimize electrical noise.\u003c\/li\u003e\n\u003cli\u003eCheck for proper grounding of the rack assembly to prevent ground loops and ensure stable voltage regulation.\u003c\/li\u003e\n\u003cli\u003eStrictly adhere to backplane power distribution standards to avoid voltage drops during peak demand cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eIs this power supply compatible with all S5 series?\u003c\/h3\u003e\u003cp\u003eThe 6ES5955-5NB11 is specifically engineered for the Simatic S5-135 and S5-155 controller families. Please verify your specific rack configuration and power requirements before installation.\u003c\/p\u003e\u003ch3\u003eWhat should I do if the unit experiences a voltage drop?\u003c\/h3\u003e\u003cp\u003eEnsure that the load on the 24 VDC and 5 VDC rails does not exceed the 15 A total capacity. Check all backplane connections for secure seating and ensure the grounding path is intact to prevent interference.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":50915767484668,"sku":"6ES5955-5NB11","price":80.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_95cee824-6024-4d46-a968-43bf68a1bacf.jpg?v=1785839573","url":"https:\/\/www.electronicplc.com\/es\/products\/siemens-6es5-955-5nb11-simatic-s5-power-supply-unit","provider":"Electronic PLC","version":"1.0","type":"link"}