{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6AG1961-3BA21-4AX0","brand":"Siemens","brandSlug":"siemens","productSlug":"6AG1961-3BA21-4AX0","canonicalUrl":"https://aoctrl.com/siemens/6AG1961-3BA21-4AX0","factsUrl":"https://aoctrl.com/api/mcp/products/6AG1961-3BA21-4AX0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SITOP PSU8200, 6AG1961-3BA21-4AX0, 24 V DC 40 A power supply, DIN rail mount, 96.6% efficiency.","salesMarkdown":"## Field-fit note – clearances and mounting The enclosure is 70 mm wide, 125 mm high, 120 mm deep. For natural convection cooling, allow 50 mm clearance above and below the unit. You can butt it left and right against adjacent units (0 mm clearance needed on those sides). Screw terminals on the input side accept 0.33 to 10 mm² conductors; output and ground use the same. That covers standard panel wiring without adapter blocks. ## Ratings you'll lean on in the field At 25 °C ambient it delivers the full 40 A at 24 V DC (typical output power 34 W). Above 60 °C, derate 3% per Kelvin up to 70 °C max. At high altitude (2000–6000 m above sea level), knock off 7.5% per 1000 m or drop ambient temperature 5 K per 1000 m — whichever fits your install site. Output regulation is tight: Vout = Vin – approx. 0.5 V, so keep input between 24 and 28.8 V DC. The relay contact (changeover, 8 A/240 V AC / 24 V DC) signals OK when both input voltages exceed the switching threshold (adjustable 20–25 V). Green LED for good, red for fault. Galvanic isolation is SELV per EN 60950-1. No-load power draw max 1.5 W, meaning it's not burning standby watts on your panel control circuit. ## Compliance lock – what certs ride with it CE marked, IP20 finger-safe enclosure, Class III operating resource. Emissions per EN 55022 Class B (suitable for residential and light industrial). Immunity per EN 61000-6-2. If your spec demands these, the part has them on the label.","metaTitle":"Siemens 6AG1961-3BA21-4AX0 SITOP PSU8200, 24 V 40 A","metaDescription":"Active-production 6AG1961-3BA21-4AX0 SITOP PSU8200, 24 V DC, 40 A output, 96.6% efficient, DIN rail mount, CE, IP20. Source to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLCs (Programmable Logic Controllers)"],"specifications":{"Top":"50 mm","Left":"0 mm","Right":"0 mm","at DC":"24 ... 28.8 V","title":"6AG1961-3BA21-4AX0","Bottom":"50 mm","At Input":"Input, output and ground: 1 screw terminal each for 0.33 ... 10 mm² single-core/finely stranded","CE marking":"Yes","Rated Range":"40 A; max. aggregate current 40 A; +60 ... +70 °C: derating 3%/K","Rated Value":"40 A","description":"SIPLUS PS E202U redundancy module based on 6EP1961-3BA21 with conformal coating, 0…+60 °C, input/output: 24 V DC/40 A suitable for decoupling two SITOP power supplies with max. 20 A output current each","MTBF at 40 °C":"6 471 654 h","lifecycle_stage":"current","Fastening Method":"Snaps onto DIN rail EN 60715 35x7.5/15","Other Information":"Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)","Galvanic Isolation":"yes, SELV acc. to EN 60950-1 (relay contact)","protection class IP":"IP20","Efficiency In Percent":"96.6 %","Depth Of The Enclosure":"120 mm","For Auxiliary Contacts":"Relay contact: 3 screw terminals for 0.5 ... 2.5 mm² single-core/finely stranded","Width Of The Enclosure":"70 mm","Height Of The Enclosure":"125 mm","Voltage Curve At Output":"Controlled, isolated DC voltage","For Emitted Interference":"EN 55022 Class B","Type Of Signal At Output":"Isolated relay contact (changeover contacts, rating 8 A/240 V AC, 24 V DC): Signals OK if both input voltages > switching threshold, setting range of threshold 20 ... 25 V","For Interference Immunity":"EN 61000-6-2","Formula For Output Voltage":"Vin - approx. 0.5 V","During Storage And Transport":"-40 ... +85 °C","Type Of Electrical Connection":"screw-type terminals","at output 1 at DC rated value":"24 V","During NO-Load Operation Maximum":"1.5 W","Type Of The Power Supply Network":"DC voltage","output voltage at DC rated value":"24 V","Operating Resource Protection Class":"Class III","Display Version For Normal Operation":"Green LED for \"both Input voltages > switching threshold\"; red LED: for \"at least one input voltage < switching threshold\"","Product Function Output Voltage Adjustable":"No","In Horizontal Mounting Position During Operation":"0 ... 60 °C; with natural convection","Installation Altitude At Height Above Sea Level Maximum":"6 000 m","Product Feature Of The Enclosure Housing Can Be Lined Up":"Yes","Chemical Resistance To Commercially Available Cooling Lubricants":"Yes; incl. diesel and oil droplets in the air","At Rated Output Voltage For Rated Value Of The Output Current Typical":"34 W","Ambient Condition Relating To Ambient Temperature - Air Pressure - Installation Altitude":"In case of operation at altitudes of 2000 - 6000 m above sea level: Output power derating of -7.5 %/1000 m or reduction of the ambient temperature by 5 K/1000 m","product conformity of the coating Qualification and Performance of Electrical Insulating Compound for Printed Board Assemblies according to IPC-CC-830A":"Yes; Conformal Coating, Class A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$269.24","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1a01e3a2db2d30f0d4fb560dcb1ca5e7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=377597&mlfb=6AG1961-3BA21-4AX0"},"ai":{"faq":[{"question":"What clearance is needed above and below this power supply?","answer":"The spec calls for 50 mm clearance above and 50 mm below the unit for natural convection cooling. Left and right sides can be flush (0 mm clearance)."},{"question":"What compliance documentation does this unit carry?","answer":"CE marked, IP20, Class III. Emissions per EN 55022 Class B, immunity per EN 61000-6-2. Galvanic isolation is SELV per EN 60950-1. These are listed on the label and can be provided with the shipment."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6AG1961-3BA21-4AX0","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/6AG1961-3BA21-4AX0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}