{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6EP1931-2EC21","brand":"Siemens","brandSlug":"siemens","productSlug":"6EP1931-2EC21","canonicalUrl":"https://aoctrl.com/siemens/6EP1931-2EC21","factsUrl":"https://aoctrl.com/api/mcp/products/6EP1931-2EC21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SITOP DC UPS module 6EP1931-2EC21, 24 V DC input, 15 A rated, 360 W active power, DIN-rail mount, IP20.","salesMarkdown":"The Siemens 6EP1931-2EC21 is a DC UPS module that sits between a 24 V DC power supply and the load, providing buffered backup when the mains drops. Rated for 15 A continuous output with 360 W active power, it supports loads up to that current draw. Input voltage range is 22 to 29 V DC, and output follows input minus roughly 0.5 V — so a 24 V supply gives about 23.5 V on the bus during normal operation. Mounting is straightforward: snaps onto DIN rail EN 60715 35x7.5/15, no tools needed. Enclosure is 50 mm wide, 125 mm deep, 125 mm high — fits a standard 50 mm slot in a panel. IP20 protection means it's for dry indoor cabinets only, not washdown areas. The 15 A rated current is the continuous output the module can deliver while buffering. Peak current hits 15.7 A — that's the short-term surge when the battery kicks in, not a steady-state rating. If your load pulls more than 15 A continuously, this module won't hold; step up to the 20 A or 40 A SITOP siblings. Charging current is listed as 0.35 A and 0.7 A — that's the rate at which the internal charger refills the battery module after a discharge. Lower charging current means longer recharge time between events; 0.7 A is the faster option if you have the battery capacity. Storage and transport range is -40 to +85 °C. cULus-Listed under UL 508 and CSA C22.2 No. 107.1, File E197259. CE marked, EAC approved. Shipbuilding approvals from ABS and DNV GL — so it's accepted in marine and offshore panels. Emission standard is EN 55022 Class B, immunity per EN 61000-6-2. No C-Tick — not certified for Australia/New Zealand. ## Wiring and connections Input side: two screw terminals accepting 1 to 4 mm² (17 to 11 AWG) for 24 V DC. Output side: four screw terminals, same wire range. That gives you two separate output feeds if needed, or one feed plus a sense line. Permissible contact current for the signaling relays is DC 60 V / 1 A or AC 30 V / 1 A — enough for PLC digital inputs or indicator lamps. Startup delay is typical 1 second — the module waits before engaging the battery after a power fail, to avoid cycling on short dips.","metaTitle":"Siemens 6EP1931-2EC21 DC UPS Module, 15 A, 360 W, DIN Rail","metaDescription":"Siemens 6EP1931-2EC21 DC UPS module, 24 V DC input, 15 A rated, 360 W active power. cULus listed, IP20, snaps onto DIN rail EN 60715. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["DIN Rail Power Supplies"],"specifications":{"Top":"50 mm","Left":"0 mm","Right":"0 mm","title":"6EP1931-2EC21","Bottom":"50 mm","C-Tick":"No","DNV GL":"Yes","At Input":"24 V DC: 2 screw terminals for 1 ... 4 mm²/17 ... 11 AWG","At Output":"24 V DC: 4 screw terminals for 1 ... 4 mm²/17 ... 11 AWG","CE marking":"Yes","Rated Value":"15 A","UL approval":"Yes","description":"SITOP DC UPS module 24 V/15 A uninterruptible power supply without interface input: 24 V DC/16 A output: 24 V DC/15 A *Ex approval no longer available*","EAC approval":"Yes","Peak Current":"15.7 A","During Storage":"-40 ... +85 °C","MTBF at 40 °C":"791 139 h","lifecycle_stage":"current","Charging Current":"0.35 A, 0.7 A","During Operation":"-25 ... +60 °C; with natural convection","During Transport":"-40 ... +85 °C","Fastening Method":"Snaps onto DIN rail EN 60715 35x7.5/15","In Buffering Mode":"Buffered mode: LED yellow (Bat), floating changeover contact \"OK/Bat\" to setting \"Bat\"; Prewarning battery voltage < 20.4 VDC: LED red (alarm), floating changeover contact \"Alarm/Bat\" to setting \"Alarm\"; Energy storage > 85%: LED green (Bat > 85%), floating NO contact \"Bat > 85\" closed","Other Information":"Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)","In Normal Operation":"0 ... 15 A","Input Voltage Range":"22 ... 29 V DC","as approval for USA":"cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259","protection class IP":"IP20","For Normal Operation":"Normal operation: LED green (OK), floating changeover contact \"Bat/OK\" to setting \"OK\" (\"OK\" means: Voltage of the supplying power supply unit is greater than cut-in threshold set at the DC UPS module); Lack of buffer standby: LED red (alarm), floating changeover contact \"Alarm/Bat\" to setting \"Alarm\"; Battery replacement required: LED red (alarm) flashing with approx. 0.25 Hz, floating changeover contact \"Alarm/Bat\" switching with approx. 0.25 Hz; Energy storage > 85%: LED green (Bat > 85%), floating NO contact \"Bat > 85\" closed; Permissible contact current capacity: DC 60 V/1 A or AC 30 V /1 A","Shipbuilding Approval":"ABS, DNV GL","Depth Of The Enclosure":"125 mm","Electrical Accessories":"Battery module","Type Of Energy Storage":"with batteries","Voltage Curve At Input":"DC","Width Of The Enclosure":"50 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. 0.5 V","Startup Delay Time Typical":"1 s","Supplied Active Power Typical":"360 W","Type Of Electrical Connection":"screw-type terminals","product component PC interface":"No","For Rechargeable Battery Module":"24 V DC: 2 screw terminals for 1 ... 4 mm²/17 ... 11 AWG","supply voltage at DC rated value":"24 V","Operating Resource Protection Class":"Class III","in buffering mode at DC rated value":"24 V","in normal operation at DC rated value":"24 V","For Control Circuit And Status Message":"10 screw terminals for 0.5 ... 2.5 mm²/20 ... 13 AWG","output voltage in buffering mode at DC":"19 ... 28.5 V","reference code according to IEC 81346-2":"RB","Adjustable Charging Current Maximum Note":"factory setting approx. 0.7 A","Property Of The Output Short-Circuit Proof":"Yes","Galvanic Isolation Between Input And Output":"No","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":"Dependent on connected battery and load current, see selection table battery module and mains buffering times as well as the relevant important information notes!","Voltage Increase Time Of The Output Voltage Typical":"60 ms","In Case Of Operation On Rechargeable Battery Typical":"15 W","input current at rated input voltage 24 V rated value":"15 A; + approx. 1 A with empty battery","Adjustable Response Value Voltage For Buffer Connection":"22 ... 25.5 V; Adjustable in 0.5 V increments","Product Feature Of The Enclosure Housing Can Be Lined Up":"Yes","Adjustable Response Value Voltage For Buffer Connection Preset":"22.5 V","Reverse Polarity Protection Against Input Voltage Polarity Reversal":"Yes","At Rated Output Voltage For Rated Value Of The Output Current Typical":"14 W","Reverse Polarity Protection Against Energy Storage Unit Polarity Reversal":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$270.75 – $550.62","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/840f60d91f98a44fecfd0f71fa21a6f6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=68465&mlfb=6EP1931-2EC21"},"ai":{"faq":[{"question":"What approvals does this module carry?","answer":"cULus-Listed (UL 508, CSA C22.2 No. 107.1), CE, EAC, ABS, DNV GL. Emission per EN 55022 Class B, immunity per EN 61000-6-2."},{"question":"What is the maximum continuous output current?","answer":"15 A rated continuous. Peak current is 15.7 A."},{"question":"Does it require forced cooling?","answer":"No, operating range -25 to +60 °C with natural convection. No fan needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6EP1931-2EC21","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/6EP1931-2EC21 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}}