{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6EP1961-2BA00","brand":"Siemens","brandSlug":"siemens","productSlug":"6EP1961-2BA00","canonicalUrl":"https://aoctrl.com/siemens/6EP1961-2BA00","factsUrl":"https://aoctrl.com/api/mcp/products/6EP1961-2BA00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SITOP buffer module, 4 outputs, 97% efficiency, 22-30 V DC input, DIN rail mount, UL 508 listed.","salesMarkdown":"The Siemens 6EP1961-2BA00 is a SITOP buffer module that bridges brief mains dips, keeping a 24 V DC control bus alive when the primary supply drops. It delivers four individually fused outputs, each protected by a 15 A blade-type fuse included at delivery. Rated efficiency of 97 % means the module loses very little energy as heat — important when it's packed into a small enclosure with other heat-generating gear. The output voltage follows the formula Vin - approx. 0.3 V, so the load sees nearly the same voltage as the input bus, just a diode drop lower. The module accepts an input voltage range of 22... 30 V DC, which covers the nominal 24 V bus and allows for some sag or overvoltage during charging. On the output side, four screw terminals (each accepting 0.22... 4 mm²) connect the loads. The simultaneous connection of all outputs after power-up is the default behavior, with a delay time of 24 ms or 100 ms programmable for sequential connection — useful when you need to stagger the startup of multiple drives or PLC racks to avoid a collective inrush surge. Overcurrent protection is staged: for a sustained overload of 1.0... 1.3 x set value, the module switches off after approx. 5 s. For a hard short (1.3 x set value), it switches off after approx. 50... 100 ms. An immediate switch-off (approx. 0.5 ms) triggers when output current exceeds the set value and input voltage drops below 20 V — this catches a dead-short condition on the bus before the fuse blows. The enclosure measures 72 mm wide, 90 mm deep, and 90 mm high, fitting a standard 190 mm mounting height on the DIN rail. The module carries CE marking, EAC approval, and UL recognition: UL-Recognized (UL 2367) File E328600 and cULus-Listed (UL 508, CSA C22.2 No. 107.1) File E197259. Safety is designed to EN 60950-1 and EN 50178. For EMC, emitted interference meets EN 55022 Class B, and immunity meets EN 61000-6-2 — so it's suitable for residential and light-industrial environments without additional filtering. ## Sourcing and Integration Reality For a panel OEM or MRO planner, the 72 mm width and DIN-rail snap-on mean it occupies one standard module slot.","metaTitle":"Siemens 6EP1961-2BA00 Buffer Module, 4 Outputs, 97% Efficien","metaDescription":"Siemens 6EP1961-2BA00 buffer module with 4 outputs, 97% efficiency, UL 508 listed. Snaps onto DIN rail. 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","IECEx":"No","Right":"0 mm","Bottom":"50 mm","At Input":"+24 V: 2 screw terminals for 0.5 ... 16 mm²; 0 V: 2 screw terminals for 0.5 ... 4 mm²","At Output":"Output 1 ... 4: 1 screw terminal each for 0.22 ... 4 mm²","CE marking":"Yes","UL approval":"Yes; UL-Recognized (UL 2367) File E328600; cULus-Listed (UL 508, CSA C22.2 No. 107.1) File E197259","EAC approval":"Yes","During Storage":"-40 ... +85 °C","MTBF at 40 °C":"616 675 h","Mounting Height":"190 mm","lifecycle_stage":"current","During Operation":"0 ... 60 °C; with natural convection","During Transport":"-40 ... +85 °C","Fastening Method":"Snaps onto DIN rail EN 60715 35x7.5/15","Number Of Outputs":"4","Other Information":"Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)","Installation Width":"72 mm","Standard For Safety":"according to EN 60950-1 and EN 50178","input voltage at DC":"22 ... 30 V","protection class IP":"IP20","Efficiency In Percent":"97 %","For Signaling Contact":"2 screw terminals for 0.22 ... 4 mm²","Of The Excess Current":"Iout = 1.0 ...1.3 x set value, switch-off after approx. 5 s","Shipbuilding Approval":"No","Depth Of The Enclosure":"90 mm","Width Of The Enclosure":"72 mm","Height Of The Enclosure":"90 mm","Voltage Curve At Output":"controlled DC voltage","For Emitted Interference":"EN 55022 Class B","For Interference Immunity":"EN 61000-6-2","Of The Current Limitation":"Iout = 1.3 x set value, switch-off after approx. 50 ... 100 ms","Formula For Output Voltage":"Vin - approx. 0.3 V","Product Component Included":"4x blade-type fuse 15 A","Type Of Outputs Connection":"Simultaneous connection of all outputs after power up of the supply voltage, delay time of 24 ms or 100 ms programmable for sequential connection","Of The Immediate Switch-Off":"Iout > set value and Vin < 20 V, switch-off after approx. 0.5 ms","Fuse Protection Type At Input":"Blade-type fuse per output (equipped when delivered with 15 A fuse)","Type Of Electrical Connection":"screw-type terminals","Type Of Response Value Setting":"via potentiometer","Overvoltage Overload Capability":"35 V; 100 ms","Type Of The Power Supply Network":"Controlled DC voltage (SITOP select is not designed for operation with DC UPS module 40 A (6EP1 931-2FC21/-2FC42)","supply voltage at DC rated value":"24 V","Operating Resource Protection Class":"Class III","Display Version For Normal Operation":"Two-color LED per output: green LED for \"Output switched through\"; red LED for \"Output switched off due to overcurrent\"","Residual Current At Switch-Off Typical":"20 mA","Product Feature Parallel Switching Of Outputs":"No","environmental category according to IEC 60721":"climate class 3K3, 5 … 95% without condensation","Design Of The Reset Device/Resetting Mechanism":"Using keys on the module","Relative Overall Tolerance Of The Voltage Note":"In accordance with the supplying input voltage","output current up to 60 °C per output rated value":"10 A","input current at rated input voltage 24 V rated value":"40 A","Design Of The Switching Contact For Signaling Function":"Common signal contact (NO contact, rating 0.5 A/24 V DC)","Galvanic Isolation Between Input And Output At Switch-Off":"No","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"2 ... 10 A","power loss [W] at rated output voltage for rated value of the output current typical":"30 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$87.63 – $137.36","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=18897&mlfb=6EP1961-2BA00","alternativesUrl":"https://aoctrl.com/api/mcp/products/6EP1961-2BA00/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does this module carry?","answer":"It carries CE marking, EAC approval, and UL recognition: UL-Recognized (UL 2367) File E328600 and cULus-Listed (UL 508, CSA C22.2 No. 107.1) File E197259. Safety is designed to EN 60950-1 and EN 50178."},{"question":"What is the output voltage of this buffer module?","answer":"The output voltage follows the formula Vin - approx. 0.3 V, so the load sees nearly the same voltage as the input bus, just a diode drop lower."},{"question":"How are the outputs connected and protected?","answer":"Four screw terminals (each accepting 0.22... 4 mm²) connect the loads. Each output is protected by a 15 A blade-type fuse included at delivery. The module can be set for simultaneous or sequential connection of all outputs after power-up."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6EP1961-2BA00","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/6EP1961-2BA00 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}}