{"product_id":"siemens-simatic-s5-6es5-951-7ld21-ps951-power-supply-module","title":"Siemens 6ES5951-7LD21 SIMATIC S5 PS951 Power Supply Module","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\u003cp\u003eThe Siemens 6ES5 951-7LD21 (PS 951) is a robust power supply module engineered for the legacy SIMATIC S5-115U and S5-115H PLC systems. This unit converts 120-230 VAC input power into a stabilized 5 VDC output, supplying either 7 A or 15 A to the backplane bus to support central processing units and I\/O modules. It is designed to maintain system stability in demanding industrial environments, such as automotive manufacturing, power generation, and metal processing, by protecting sensitive logic circuits from AC line fluctuations and voltage instability.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDesigned specifically for SIMATIC S5-115U and S5-115H rack systems.\u003c\/li\u003e\n\u003cli\u003eProvides reliable 5 VDC output for backplane bus distribution.\u003c\/li\u003e\n\u003cli\u003eIntegrated short-circuit and overvoltage protection for rack safety.\u003c\/li\u003e\n\u003cli\u003ePassive convection cooling design for operation in enclosed industrial cabinets.\u003c\/li\u003e\n\u003cli\u003eFront-panel status indicators for real-time monitoring of input and output voltage health.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eApplications\u003c\/h3\u003e\u003cp\u003eThis power supply module is a critical component for maintaining uptime in legacy Siemens S5-115 series PLC installations. It is typically deployed in large-scale automation systems where consistent DC power is required for CPU operation and extensive I\/O configurations.\u003c\/p\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003ctable border=\"1\"\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003e6ES5 951-7LD21\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\u003eSystem Series\u003c\/td\u003e\n\u003ctd\u003eSIMATIC S5-115U \/ S5-115H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModule Type\u003c\/td\u003e\n\u003ctd\u003ePower Supply Module (PS 951)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e120 VAC to 230 VAC\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\u003eOutput Current\u003c\/td\u003e\n\u003ctd\u003e7 A \/ 15 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e0 to 60 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatus\u003c\/td\u003e\n\u003ctd\u003eDiscontinued\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEnsure the PLC rack is powered down before inserting or removing the power supply module.\u003c\/li\u003e\n\u003cli\u003eThe module relies on passive convection cooling; ensure adequate clearance above and below the unit in the control cabinet to maintain airflow.\u003c\/li\u003e\n\u003cli\u003eVerify that the input voltage matches the module rating before applying power.\u003c\/li\u003e\n\u003cli\u003eEnsure the module is fully seated in the subrack to guarantee proper contact with the backplane bus pins.\u003c\/li\u003e\n\u003cli\u003eHandle with care to avoid damage to the connector pins; use standard ESD protection practices during installation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003ch3\u003eIs this module compatible with S5-135U or S5-155U systems?\u003c\/h3\u003e\u003cp\u003eNo, the 6ES5 951-7LD21 is specifically designed for the mechanical and electrical requirements of the S5-115U and S5-115H series. It is not intended for use in the larger S5-135U or S5-155U rack architectures.\u003c\/p\u003e\u003ch3\u003eDoes this unit include a backup battery?\u003c\/h3\u003e\u003cp\u003eNo, this specific version does not include an integrated backup battery. It relies on internal capacitors for short-term ride-through capability during minor power interruptions.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":50644277100796,"sku":"6ES5951-7LD21","price":80.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/9983\/1292\/files\/wm_1_9841dbb7-adf5-4bb2-827e-a8426e6eaf65.jpg?v=1784962754","url":"https:\/\/www.electronicplc.com\/products\/siemens-simatic-s5-6es5-951-7ld21-ps951-power-supply-module","provider":"Electronic PLC","version":"1.0","type":"link"}