{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6EP1961-2BA31","brand":"Siemens","brandSlug":"siemens","productSlug":"6EP1961-2BA31","canonicalUrl":"https://aoctrl.com/siemens/6EP1961-2BA31","factsUrl":"https://aoctrl.com/api/mcp/products/6EP1961-2BA31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SITOP buffer module, 6EP1961-2BA31, 24 V DC input (22-30 V), 4 outputs, 97% efficiency, IP20, snaps onto DIN rail EN 60715.","salesMarkdown":"The Siemens 6EP1961-2BA31 is a SITOP buffer module that takes a 24 V DC input (22-30 V) and delivers four controlled DC outputs at Vin minus roughly 0.2 V. It snaps onto a DIN rail EN 60715 35x7.5/15, so it lands in the same panel as the SITOP power supply it buffers. The 72 mm width and 80 mm height keep it to a single DIN-space footprint — useful when you're packing a control cabinet and every millimeter of rail matters. The 97% efficiency means the module doesn't waste much heat inside the enclosure — less derating worry when you stack it next to other DIN-rail gear. The output voltage tracks the input minus about 0.2 V, so if your supply is set to 24.5 V, the buffer delivers roughly 24.3 V at the outputs. That's tight regulation for a buffer stage; you're not losing a volt across the module. Overcurrent protection is staged: for a sustained overload of 1.0 to 1.5 times the set current, it switches off after about 5 seconds. For a hard short, the current limit kicks at 1.5 times set value and trips in typically 100 ms. That gives you selectivity headroom downstream — a branch fault clears before the buffer drops, so the rest of the 24 V bus stays up. The remote reset input is a non-isolated 24 V signal that accepts a \"high\" above 15 V. Wire it to a PLC digital output or a pushbutton, and you can reset the module after a fault without opening the panel door. Handy for remotely cycled machinery or locked cabinets. ## Clearance and Mounting The spec calls for 50 mm clearance above and below the module. That's for natural convection cooling — the module is rated for -25 to +60 °C operation with natural convection, so don't box it in tight. Left and right clearance can be zero, meaning you can butt-mount modules side by side on the DIN rail. That's the standard SITOP footprint: 72 mm wide, 80 mm tall, 72 mm deep. The module carries CE marking, EAC approval, and UL recognition under UL 2367 (File E328600) plus cULus listing to UL 508 and CSA C22.2 No. 107.1 (File E197259). It also holds shipbuilding approvals from DNV GL and ABS. 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 suited for industrial environments without needing an external filter for conducted emissions.","metaTitle":"Siemens 6EP1961-2BA31 Buffer Module, 24 V DC, 4 Outputs, 97%","metaDescription":"Siemens 6EP1961-2BA31 buffer module, 24 V DC input, 4 outputs, 97% efficiency, IP20, DIN rail mount. UL recognized, shipbuilding approved. Current production. Quoted to order.","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","title":"6EP1961-2BA31","Bottom":"50 mm","DNV GL":"Yes","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 0.5 ... 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","description":"SITOP PSE200U 3 A Selectivity module 4-channel input: 24 V DC/12 A output: 24 V DC/4x 3 A threshold value adjustable 0.5-3 A with status message for each output *Ex approval no longer available*","EAC approval":"Yes","During Storage":"-40 ... +85 °C","MTBF at 40 °C":"755 915 h","Mounting Height":"180 mm","lifecycle_stage":"current","During Operation":"-25 ... +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":"1 screw terminal for 0.5 ... 4 mm²","Of The Excess Current":"Iout = 1.0 ...1.5 x set value, switch-off after approx. 5 s","Remote Reset Function":"Non-electrically isolated 24 V input (signal level \"high\" at > 15 V)","Shipbuilding Approval":"DNV GL, ABS","Depth Of The Enclosure":"72 mm","For Auxiliary Contacts":"Remote reset: 1 screw terminal for 0.5 ... 4 mm²","Mechanical Accessories":"Device identification label 20 mm × 7 mm, TI-grey 3RT2900-1SB20","Width Of The Enclosure":"72 mm","Height Of The Enclosure":"80 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 = 1.5 x set value, switch-off after typ. 100 ms","Formula For Output Voltage":"Vin - approx. 0.2 V","Type Of Outputs Connection":"Simultaneous connection of all outputs after power up of the supply voltage > 20 V, delay time of 25 ms, 100 ms or adjustable \"load optimised\" via DIP switch 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":"5 A per output (not accessible)","Type Of Electrical Connection":"screw-type terminals","Type Of Response Value Setting":"via potentiometer","Overvoltage Overload Capability":"35 V","Type Of The Power Supply Network":"Controlled DC voltage","supply voltage at DC rated value":"24 V","Operating Resource Protection Class":"Class III","Display Version For Normal Operation":"Three-color LED per output: green LED for \"Output switched through\"; yellow LED for \"Output switched off manually\"; red LED for \"Output switched off due to overcurrent\"","Residual Current At Switch-Off Typical":"1 mA","American Bureau of Shipping Europe Ltd. (ABS)":"Yes","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":"via sensor per output","Relative Overall Tolerance Of The Voltage Note":"In accordance with the supplying input voltage","output current up to 60 °C per output rated value":"3 A","input current at rated input voltage 24 V rated value":"12 A","Design Of The Switching Contact For Signaling Function":"Status signal output (pulse/pause signal, can be evaluated via Simatic function block)","Galvanic Isolation Between Input And Output At Switch-Off":"No","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.5 ... 3 A","power loss [W] at rated output voltage for rated value of the output current typical":"9 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$86.36","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/abb509de368e6b69618e1c2eef82d861.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=155700&mlfb=6EP1961-2BA31"},"ai":{"faq":[{"question":"What are the key specifications of 6EP1961-2BA31?","answer":"It's a 24 V DC buffer module with four outputs, 97% efficiency, IP20 protection, DIN rail mount, 72 mm wide, and requires 50 mm clearance above and below for natural convection cooling. Input range is 22-30 V DC, output voltage is input minus roughly 0.2 V."},{"question":"What approvals does 6EP1961-2BA31 carry?","answer":"CE, EAC, UL Recognized (UL 2367), cULus Listed (UL 508, CSA C22.2 No. 107.1), and shipbuilding approvals from DNV GL and ABS. Safety per EN 60950-1 and EN 50178; EMC per EN 55022 Class B and EN 61000-6-2."},{"question":"Where can I buy 6EP1961-2BA31?","answer":"This module is sourced and quoted to order through independent industrial distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6EP1961-2BA31","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/6EP1961-2BA31 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}}