{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6EP1961-2BA21","brand":"Siemens","brandSlug":"siemens","productSlug":"6EP1961-2BA21","canonicalUrl":"https://aoctrl.com/siemens/6EP1961-2BA21","factsUrl":"https://aoctrl.com/api/mcp/products/6EP1961-2BA21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SITOP buffer module, 6EP1961-2BA21, 4 outputs, 99% efficiency, 22-30 V DC input, DIN rail mount, IP20, UL/cULus/CE/DNV GL/ABS approved.","salesMarkdown":"## SITOP buffer module, 4-output, 99% efficiency The Siemens 6EP1961-2BA21 is a SITOP buffer module that bridges supply dips with four controlled DC outputs. It snaps onto a DIN rail EN 60715 35x7.5/15 and occupies 72 mm width, 80 mm height, 72 mm depth — a compact footprint for control-panel integration. Input accepts 22-30 V DC; output follows Vin minus roughly 0.2 V, with a controlled DC voltage curve. Efficiency hits 99 %, so nearly all input power passes through to the load, minimizing thermal waste inside the enclosure. Four outputs let this module buffer multiple loads — PLC, I/O slices, fieldbus power supplies — from a single buffer stage. The overcurrent protection trips at 1.0-1.5× set value with a 5-second delay; a faster current limitation kicks in at 1.5× set value with roughly 100 ms switch-off. That dual curve means nuisance trips from inrush are unlikely, but hard shorts clear quickly. The remote reset input (non-electrically isolated, signal high above 15 V) allows automated recovery after a fault, useful for remote or unattended panels. The 50 mm top clearance and 50 mm bottom clearance are the minimum free air space above and below the module for natural convection cooling — respect those in the panel layout to avoid derating.","metaTitle":"Siemens 6EP1961-2BA21 Buffer Module, 4 Outputs, 99% Efficien","metaDescription":"Siemens 6EP1961-2BA21 buffer module with 4 outputs, 99% efficiency, 22-30 V DC input. UL, cULus, DNV GL, ABS approved. Active production, available to order against 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","title":"6EP1961-2BA21","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 10 A Selectivity module 4-channel input: 24 V DC/40 A output: 24 V DC/4x 10 A Level adjustable 3-10 A with common signaling contact *Ex approval no longer available*","EAC approval":"Yes","During Storage":"-40 ... +85 °C","MTBF at 40 °C":"540 979 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":"99 %","For Signaling Contact":"3 screw terminals 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":"15 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":"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 (changeover contact, rating 0.1 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":"3 ... 10 A","power loss [W] at rated output voltage for rated value of the output current typical":"10 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$94.49","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a5557c2c2e0be4fdcfe333d8bbfaf41e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=183878&mlfb=6EP1961-2BA21"},"ai":{"faq":[{"question":"What are the key approvals for 6EP1961-2BA21?","answer":"It carries CE marking, UL recognition (UL 2367), cULus listing (UL 508, CSA C22.2 No. 107.1), EAC approval, and shipbuilding approvals from DNV GL and ABS."},{"question":"What is the input voltage range for 6EP1961-2BA21?","answer":"The input voltage at DC is 22-30 V. Output voltage follows the formula Vin minus approximately 0.2 V."},{"question":"What clearance is required above and below the module?","answer":"Top clearance is 50 mm and bottom clearance is 50 mm — these are the minimum free air spaces for natural convection cooling."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6EP1961-2BA21","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/6EP1961-2BA21 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}}