{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7405-0RA02-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7405-0RA02-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7405-0RA02-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7405-0RA02-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-400, power supply PS405, 20 A, wide range, 24/48/60 V DC, 5 V DC/20 A.","salesMarkdown":"The Siemens 6ES7405-0RA02-0AA0 is a SIMATIC S7-400 PS405 power supply that delivers 20 A at 5 V DC to the backplane bus — no base load required — and provides up to 1 A at 24 V DC for the I/O bus, idling-proof. It accepts a wide DC input range spanning 24 V DC, 48 V DC, and 60 V DC, with rated output currents of 7 A, 3.2 A, and 2.5 A respectively at those voltages. The 20 A at 5 V DC is the headline figure — it powers the S7-400 backplane bus and all modules plugged into it. Unlike some supplies that require a minimum load on the 5 V rail, this one needs no base load, so it's stable even with a lightly populated rack. The wide DC input (24/48/60 V DC) makes this a single SKU for plants running mixed DC voltage levels — common in process industries where 24 V control and 48 V or 60 V field devices coexist. At 24 V DC it delivers 7 A; at 48 V DC, 3.2 A; at 60 V DC, 2.5 A. The input is primary/secondary rated, so it can be configured for redundant or isolated feeds. The supply occupies 2 slots in the S7-400 rack and measures 50 mm wide, 290 mm high, 217 mm deep. That's a standard double-width S7-400 footprint; it fits any UR1, UR2, or CR2 rack without panel modification. Typical power loss is 44 W, with active power input of 168 W. Inrush current peaks at 56 A with a 1.5 ms half-width — brief enough that standard upstream breakers won't nuisance-trip. Mains buffering holds the output for 20 ms on a power dip, and it meets NAMUR recommendations for process plants. Approvals include BIS (India), CCC (China), and FM approval (Class I, Division 2, T4, 0 °C to 60 °C). Overvoltage category II. Equipment protection class I with protective conductor. The FM rating makes it suitable for hazardous locations where gas groups are present. Electrical connection uses 3x 1.5 mm² solid or stranded wire with end sleeve, accepting an external diameter of 3 mm to 9 mm. The terminal design matches standard S7-400 connector blocks. Short-circuit protection is built in. An optional backup battery (2x lithium AA, 3.6 V / 2.2 Ah) can be fitted for memory retention during extended power loss.","metaTitle":"6ES7405-0RA02-0AA0 SIMATIC S7-400 PS405 Power Supply, 20A, 2","metaDescription":"Siemens 6ES7405-0RA02-0AA0 SIMATIC S7-400 power supply PS405, 20A output, wide-range 24/48/60 VDC input, 5 VDC/20A backplane bus. Active, sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLC I/O & Expansion Modules"],"specifications":{"BIS":"Yes","CCC":"Yes","Max.":"60 °C","Min.":"0 °C","Depth":"217 mm","Width":"50 mm","5 V DC":"Yes","Height":"290 mm","24 V DC":"Yes","48 V DC":"Yes","60 V DC":"Yes","FM approval":"Yes; Ta: 0 °C to 60 °C T4","Required Slots":"2","Weight, approx.":"1 300 g","lifecycle_stage":"mature","Power loss, typ.":"44 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 A","Rated value at 48 V DC":"3.2 A","Rated value at 60 V DC":"2.5 A","Type of output voltage":"DC","Active power input, typ.":"168 W","Short-circuit protection":"Yes","Backup battery (optional)":"Yes; 2x lithium AA; 3.6 V / 2.2 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; no 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":"$838.20 – $2,028.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=327286&mlfb=6ES7405-0RA02-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7405-0RA02-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative to the 6ES7405-0RA02-0AA0?","answer":"The 6ES7400-1JA11-0AA1 is a peer S7-400 rack, not a power supply — it's a different part class. The 6ES7405-0RA02-0AA0 is the current wide-range PS405 supply; there is no direct second-source substitute from Siemens. For an exact replacement, source this order code."},{"question":"What certifications does the 6ES7405-0RA02-0AA0 carry?","answer":"It carries BIS (India), CCC (China), and FM approval (Class I, Division 2, T4, 0 °C to 60 °C). Overvoltage category II. Equipment protection class I with protective conductor."},{"question":"Will the 6ES7405-0RA02-0AA0 fit in a panel designed for the 6ES7400-1JA11-0AA1 rack?","answer":"The 6ES7400-1JA11-0AA1 is a 9-slot rack, not a power supply. The PS405 mounts in any standard S7-400 rack (UR1, UR2, CR2) occupying 2 slots. If the panel already has a UR1 or UR2 rack with two free slots, it will fit without rewiring."},{"question":"What is the hold-up time on mains failure?","answer":"The supply provides 20 ms of mains buffering and meets NAMUR recommendations for process plants. An optional backup battery (2x lithium AA, 3.6 V / 2.2 Ah) can extend memory retention during longer outages."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7405-0RA02-0AA0","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/6ES7405-0RA02-0AA0 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}}