{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6EP1961-3BA01","brand":"Siemens","brandSlug":"siemens","productSlug":"6EP1961-3BA01","canonicalUrl":"https://aoctrl.com/siemens/6EP1961-3BA01","factsUrl":"https://aoctrl.com/api/mcp/products/6EP1961-3BA01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SITOP buffer module, 6EP1961-3BA01, 40 A rated, 24 V DC input, DIN rail mount, IP20, UL/CSA listed.","salesMarkdown":"The Siemens 6EP1961-3BA01 is a buffer module from the SITOP family, designed to bridge brief mains dips or hold up the 24 V DC bus during a controlled shutdown. It accepts a 24...28.8 V DC input and delivers an output equal to Vin minus approximately 1 V, rated for a continuous 40 A. Galvanic isolation between input and output keeps fault paths separate — important when the buffer feeds a safety PLC or motion controller that must not share a ground loop with the main rectifier. The enclosure measures 70 mm wide, 125 mm high, 121 mm deep — fits a standard 70 mm slot in a gland-plate layout. Storage and transport tolerate -40 to +85 °C. This is an active, factory-current part. The 40 A rating and 24 V DC input are the key BOM-fit parameters. Screw terminals accept 0.5...10 mm² at input and output — no special crimp tool needed. The green LED lights when supply voltage exceeds 20.5 V, giving a quick visual check during commissioning. MTBF at 40 °C is over 2.5 million hours, which aligns with a 10+ year service life in a controlled environment.","metaTitle":"Siemens 6EP1961-3BA01 Buffer Module, 40 A, 24 V DC, DIN Rail","metaDescription":"Siemens 6EP1961-3BA01 buffer module, 40 A rated, 24 V DC input, DIN rail mount, UL/CSA listed, active production. Sourced to order via RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["DIN Rail Power Supplies"],"specifications":{"Top":"50 mm","ATEX":"No","Left":"0 mm","Right":"0 mm","title":"6EP1961-3BA01","Bottom":"50 mm","C-Tick":"No","DNV GL":"Yes","At Input":"+: 1 screw terminal for 0.5 ... 10 mm²","At Output":"-: 1 screw terminal for 0.5 ... 10 mm²","CE marking":"Yes","Rated Value":"40 A","UL approval":"Yes","description":"SITOP PSE201U buffer module Buffer time 100 ms to 10 s depending on load current *Ex approval no longer available*","EAC approval":"Yes","During Storage":"-40 ... +85 °C","MTBF at 40 °C":"2 538 071 h","lifecycle_stage":"current","During Operation":"-25 ... +70 °C; with natural convection","During Transport":"-40 ... +85 °C","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)","Input Voltage Range":"24 ... 28.8 V DC","as approval for USA":"UL-Listed (UL 508), File E197259; CSA (CSA C22.2 No. 14, CSA C22.2 No. 107.1)","protection class IP":"IP20","For Normal Operation":"Green LED for \"supply voltage > 20.5 V\"","Shipbuilding Approval":"ABS, DNV GL","Depth Of The Enclosure":"121 mm","Voltage Curve At Input":"DC","Width Of The Enclosure":"70 mm","Design Of The Interface":"without","Height Of The Enclosure":"125 mm","For Emitted Interference":"EN 55022 Class B","For Interference Immunity":"EN 61000-6-2","Formula For Output Voltage":"Vin - approx. 1 V","cCSAus, Class 1, Division 2":"No","Type Of Electrical Connection":"screw-type terminals","product component PC interface":"No","supply voltage at DC rated value":"24 V","Operating Resource Protection Class":"Class III","reference code according to IEC 81346-2":"RB","Galvanic Isolation Between Input And Output":"Yes","American Bureau of Shipping Europe Ltd. (ABS)":"Yes","environmental category according to IEC 60721":"Climate class 3K3, 5 … 95% no condensation","Design Of The Mains Power Cut Bridging-Connection":"Backup time: with 40 A load current: 200 ms; with 20 A load current: 400 ms; with 10 A load current: 800 ms; with 5 A load current: 1.6 s. Reduces the backup time by 100 ms in combination with 6EP1 437-3BA10. Maximum backup time 100 ms in combination with 6EP1 336-2BA10 (load current 20 A).","Product Feature Of The Enclosure Housing Can Be Lined Up":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$132.08","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/121d463ba2930176c93b3ad06dfef008.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=280209&mlfb=6EP1961-3BA01"},"ai":{"faq":[{"question":"What are the key approvals for this buffer module?","answer":"UL-Listed (UL 508, File E197259), CSA (C22.2 No. 14 / 107.1), CE, EAC, and shipbuilding approvals from ABS and DNV GL."},{"question":"What is the output voltage of the 6EP1961-3BA01?","answer":"Output voltage equals the input voltage minus approximately 1 V. With a 24 V DC input, expect about 23 V DC at the output under load."},{"question":"Will the 6EP1961-3BA01 fit in a standard DIN rail panel?","answer":"Yes, it snaps onto DIN rail EN 60715 (35x7.5/15). The enclosure is 70 mm wide, 125 mm high, 121 mm deep — fits a standard 70 mm slot."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6EP1961-3BA01","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/6EP1961-3BA01 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}}