{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7405-0RA01-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7405-0RA01-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7405-0RA01-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7405-0RA01-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-400, PS 405 power supply, wide range 20 A, 24/48/60 V DC, 5 V / 20 A DC.","salesMarkdown":"The Siemens 6ES7405-0RA01-0AA0 is a SIMATIC S7-400 PS 405 power supply that accepts 24 V DC, 48 V DC, or 60 V DC input and provides a regulated 5 V DC output at up to 20 A for the backplane bus. It occupies three slots in the S7-400 rack and draws a typical active power input of 175 W, with a typical power loss of 51 W. ## Backplane power and slot budget The 5 V DC backplane output is rated for 20 A continuous, with a 200 mA base load required to keep the bus regulation stable. An additional 24 V DC backplane output provides up to 1 A and is idling-proof, meaning it can run with no load. The 24 V DC input rating is 7.3 A; at 48 V DC it draws 3.45 A; at 60 V DC it draws 2.75 A. At 75 mm wide and 290 mm high, the module consumes three slot positions in the rack — a key constraint when laying out a dense S7-400 chassis. The depth of 217 mm matches the standard S7-400 form factor. ## Ruggedness and compliance Rated for operation from 0 °C to 60 °C, with FM approval up to 40 °C at T4. Overvoltage category II, equipment protection class I with protective conductor. The supply holds up the output for 20 ms on mains failure and supports NAMUR buffering recommendation. An optional backup battery (2x lithium AA, 3.6 V / 1.9 Ah) maintains the backplane memory during extended power loss. ## Connection and protection Short-circuit protection is built in. Inrush current peaks at 56 A with a 1.5 ms half-width — brief enough to avoid nuisance tripping of upstream breakers in most panels.","metaTitle":"Siemens 6ES7405-0RA01-0AA0 SIMATIC S7-400 PS 405 Power Suppl","metaDescription":"Siemens 6ES7405-0RA01-0AA0 SIMATIC S7-400 PS 405 power supply, 24/48/60 V DC input, 5 V DC / 20 A backplane output. Mature lifecycle, FM approved. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"Max.":"60 °C","Min.":"0 °C","Depth":"217 mm","Width":"75 mm","5 V DC":"Yes","Height":"290 mm","24 V DC":"Yes","48 V DC":"Yes","60 V DC":"Yes","FM approval":"Yes; up to 40 °C: T4","Required Slots":"3","Weight, approx.":"2 200 g","lifecycle_stage":"mature","Power loss, typ.":"51 W","Primary/Secondary":"Yes","Inrush current, max.":"56 A; Full width at half maximum 1.5 ms","Overvoltage category":"II","Rated value at 24 V DC":"7.3 A","Rated value at 48 V DC":"3.45 A","Rated value at 60 V DC":"2.75 A","Active power input, typ.":"175 W","Short-circuit protection":"Yes","Backup battery (optional)":"Yes; 2x lithium AA; 3.6 V / 1.9 Ah","Equipment protection class":"I, with protective conductor","Design of electrical connection":"3x 1.5 mm², solid or stranded wire with end sleeve, external diameter 3 mm to 9 mm","for backplane bus (5 V DC), max.":"20 A; 200 mA base load required","for backplane bus (24 V DC), max.":"1 A; idling-proof","Mains/voltage failure stored energy time":"20 ms","Mains buffering according to NAMUR recommendation":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$594.36","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=137819&mlfb=6ES7405-0RA01-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7405-0RA01-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — the 6ES7405-0DA02-0AA1?","answer":"The 6ES7405-0DA02-0AA1 is a single-slot PS 405 power supply with a 4 A backplane output (vs. 20 A) and a 2 A input rating at 24 V DC (vs. 7.3 A). It will not drop into a panel wired for the 20 A version without verifying the backplane load and slot count. If your S7-400 rack needs less than 4 A on the 5 V bus and you want to free two slots, the 0DA02 is a valid alternative."},{"question":"What is the operating temperature range?","answer":"0 °C to 60 °C. FM approval is valid up to 40 °C at T4."},{"question":"Will the 6ES7405-0RA01-0AA0 fit in a rack designed for the 6ES7405-0DA02-0AA1?","answer":"No — the 0RA01 is 75 mm wide and requires three slots, while the 0DA02 is 25 mm wide and uses one slot. The rack must have three adjacent slots available for the 0RA01. The height (290 mm) and depth (217 mm) are identical, so the rack itself does not need replacement, but slot allocation must be adjusted."},{"question":"What compliance documentation does this power supply carry?","answer":"FM approval is confirmed (up to 40 °C, T4). Equipment protection class I with protective conductor. Overvoltage category II. NAMUR buffering recommendation is supported. The evidence does not list UL, CSA, CE, RoHS, or REACH documentation for this specific order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7405-0RA01-0AA0","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/6ES7405-0RA01-0AA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}