{"product_id":"6es5955-3lf12-siemens-simatic-s5-power-supply-unit","title":"Siemens 6ES5955-3LF12 Simatic S5 Power Supply Unit","description":"\u003cp\u003eThe Siemens 6ES5955-3LF12 is a robust, high-capacity power supply unit designed for the Simatic S5 automation system. It serves as a critical component for powering central controllers and expansion racks, including the S5-135U, S5-150U, S5-155E, and S5-185U series. This unit ensures reliable operation by converting standard 115 VAC or 230 VAC mains input into a stable 5 VDC logic supply, capable of handling high-current demands in demanding industrial environments.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Current Capacity:\u003c\/strong\u003e Delivers up to 40 A at 5 VDC for complex backplane configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Input:\u003c\/strong\u003e User-selectable input voltage settings for 115 VAC or 230 VAC operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Circuits:\u003c\/strong\u003e Integrated overvoltage (OVP) and overcurrent (OCP) protection to safeguard backplane components.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalvanic Isolation:\u003c\/strong\u003e High-barrier isolation between input mains and internal logic rails to mitigate field-side electrical interference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Management:\u003c\/strong\u003e Heavy-duty aluminum heat sinks designed for efficient heat dissipation within standard rack-guided airflow channels.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis power supply is engineered for legacy Simatic S5 systems found in heavy industrial sectors, including continuous chemical processing plants, automated container terminals, and metal rolling mills. It is essential for maintaining system integrity and preventing downtime in legacy control architectures.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e6ES5955-3LF12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSimatic S5 (955 Series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e115 VAC \/ 230 VAC (50\/60 Hz)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd\u003e5 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Output Current\u003c\/td\u003e\n\u003ctd\u003e40 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 to 70 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Off:\u003c\/strong\u003e Always disconnect the main power source before installing or removing the module from the rack.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Ensure the unit is securely seated in the designated chassis slot to maintain proper electrical contact with the backplane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVentilation:\u003c\/strong\u003e Do not obstruct the airflow channels; ensure adequate clearance above and below the unit to allow for natural convection cooling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrounding:\u003c\/strong\u003e Verify that the rack chassis is properly grounded to prevent electrical noise and ensure safety.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Configuration:\u003c\/strong\u003e Confirm the input voltage link settings match the local supply grid before applying power.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eIs this power supply compatible with all S5 racks?\u003c\/h3\u003e\u003cp\u003eThis model is specifically designed for the S5-135U, S5-150U, S5-155E, and S5-185U configurations. Please verify your specific rack model before installation.\u003c\/p\u003e\u003ch3\u003eWhat should I do if the power supply trips?\u003c\/h3\u003e\u003cp\u003eThe unit features internal protection. If it trips, check for short circuits on the backplane or excessive current draw from connected modules. Ensure the input voltage is stable and within the specified range.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":51006413766908,"sku":"6ES5955-3LF12","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_58408a5e-b885-44ce-9b41-97bc52f0d34b.jpg?v=1787503196","url":"https:\/\/www.electronicplc.com\/products\/6es5955-3lf12-siemens-simatic-s5-power-supply-unit","provider":"Electronic PLC","version":"1.0","type":"link"}