{"product_id":"6es5955-3lf12-siemens-simatic-s5-power-supply-unit","title":"Siemens 6ES5955-3LF12 Simatic S5 Power Supply Unit","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Siemens 6ES5955-3LF12 is a robust, high-current power supply unit designed specifically for the Simatic S5 automation family. This module is engineered to provide stable, regulated 5 VDC power to central controllers and expansion racks, including the S5-135U, 150U, 155E, and 185U series. It serves as a vital component in legacy industrial control architectures, ensuring that backplane logic remains energized and protected against fluctuations in the primary AC supply.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Power Output:\u003c\/strong\u003e Delivers a continuous 40 A at 5 VDC, supporting demanding multi-processor configurations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Input:\u003c\/strong\u003e Supports selectable 115 VAC or 230 VAC single-phase input voltage ranges to accommodate various facility power grids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtection Circuitry:\u003c\/strong\u003e Includes integrated Overvoltage Protection (OVP) and Overcurrent Protection (OCP) to safeguard the rack bus from faults.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGalvanic Isolation:\u003c\/strong\u003e High-performance isolation barriers effectively decouple the logic rails from AC line noise and field-side disturbances.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Management:\u003c\/strong\u003e Features heavy-duty aluminum heat sinks and optimized airflow channels for reliable operation in high-load environments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis power supply is intended for use in mission-critical legacy automation systems, such as those found in continuous chemical processing plants, heavy metal rolling mills, and automated container terminal logistics. Maintaining operational spares of this unit is essential for preventing unplanned downtime in systems where S5 controllers remain in active service.\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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSiemens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eSimatic S5 (955)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e115\/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 Current Capacity\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\u003eEnsure the rack is fully powered down before attempting to insert or remove the power supply module.\u003c\/li\u003e\n\u003cli\u003eVerify that the voltage selection links are correctly configured for your local AC supply (115V or 230V) before applying power.\u003c\/li\u003e\n\u003cli\u003eEnsure the module is fully seated in the rack guide rails to maintain proper electrical contact with the backplane.\u003c\/li\u003e\n\u003cli\u003eMaintain adequate clearance around the module to allow for natural convection cooling through the heat sinks.\u003c\/li\u003e\n\u003cli\u003eFollow standard ESD precautions when handling the module to prevent damage to internal sensitive electronics.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eIs this power supply compatible with all S5 series racks?\u003c\/h3\u003e\u003cp\u003eThe 6ES5955-3LF12 is specifically designed for the S5-135U, 150U, 155E, and 185U systems. Please verify your specific rack compatibility before installation.\u003c\/p\u003e\u003ch3\u003eWhat should I do if the OVP or OCP triggers?\u003c\/h3\u003e\u003cp\u003eIf the supply latches off, check the rack backplane and connected modules for any short circuits or excessive load conditions. Once the fault is cleared, power-cycling the unit is typically required to reset the protection circuitry.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":44731110883416,"sku":"6ES5955-3LF12","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0670\/2039\/0488\/files\/wm_1_13f50b85-bc75-4484-a2ab-28b7f9873bde.jpg?v=1788667174","url":"https:\/\/www.industriaxplc.com\/id\/products\/6es5955-3lf12-siemens-simatic-s5-power-supply-unit","provider":"IndustriaX Limited","version":"1.0","type":"link"}