{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6EP3447-8SB00-0AY0","brand":"Siemens","brandSlug":"siemens","productSlug":"6EP3447-8SB00-0AY0","canonicalUrl":"https://aoctrl.com/siemens/6EP3447-8SB00-0AY0","factsUrl":"https://aoctrl.com/api/mcp/products/6EP3447-8SB00-0AY0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SITOP PSU8200, 48 V DC / 20 A, 400-500 V AC 3-phase input, 94 % efficiency, DIN rail mount, IP20.","salesMarkdown":"## 48 V DC, 20 A — the thermal budget is the real constraint The Siemens 6EP3447-8SB00-0AY0 is a SITOP PSU8200 series DIN rail power supply delivering a rated 20 A at 48 V DC from a 400–500 V AC three-phase input. The headline number is 20 A continuous, but the operating envelope matters more: the rated range is 0–20 A from 0 to +60 °C, then derates 4 %/K up to +70 °C with natural convection. At 65 °C ambient, that drops the usable current to about 16 A — a detail that decides whether this unit holds up in a warm cabinet. ## Efficiency, MTBF, and the failure-mode read At 94 % efficiency, the PSU8200 wastes about 64 W at full load — that heat has to leave the enclosure, and the derating curve is the consequence. The MTBF at 40 °C is 520,782 hours, which pencils out to roughly 59 years mean time between failures under ideal conditions. In a real panel at 50 °C with full load, expect the MTBF to drop by roughly half per 10 °C rise above the rating point — a standard reliability rule for electrolytic-cap-limited supplies. The I²t value at maximum is 2.24 A²·s, which governs the inrush profile for upstream breaker coordination. The feeder recommendation calls for a 3-pole 10–16 A C-curve MCB or a Siemens 3RV2011-1DA10 set at 3 A. That selectivity window is tight — if the panel already uses B-curve breakers, the inrush may nuisance-trip on first power-up. ## Clearance, mounting, and approvals checklist Required free space: 40 mm above and below for convection airflow, but 0 mm on the left and right sides — so it can be ganged directly against adjacent modules without side gap. Approvals include cULus listing under UL 508 and CSA C22.2 No. 107.1 (File E197259), plus cCSAus to UL 60950-1 and CSA C22.2 No. 60950-1. Also carries CE, EAC, and DNV GL marine certification. No ATEX, IECEx, or UL hazloc approval — this is a general industrial and marine-grade supply, not for explosive atmospheres.","metaTitle":"Siemens 6EP3447-8SB00-0AY0 SITOP PSU8200 48V 20A DIN Rail","metaDescription":"Siemens 6EP3447-8SB00-0AY0 SITOP PSU8200, 48V 20A output, 400-500V AC input, 94% efficiency, UL 508 listed, DIN rail mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["DIN Rail Power Supplies"],"specifications":{"Top":"40 mm","ATEX":"No","Left":"0 mm","IECEx":"No","Right":"0 mm","title":"6EP3447-8SB00-0AY0","Bottom":"40 mm","DNV GL":"Yes","Maximum":"1 mA","Typical":"0.6 mA","At Input":"L1, L2, L3, PE: 1 screw terminal each for 0.5 ... 4 mm² single-core/finely stranded","At Output":"+: 2 screw terminals each for 0.5 ... 16 mm²; -: 3 screw terminals each for 0.5 ... 16 mm²","CE marking":"Yes","NEC Class 2":"No","Rated Range":"0 ... 20 A; +60 ... +70 °C: Derating 4%/K","Rated Value":"20 A","UL approval":"Yes; cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259; cCSAus (CSA C22.2 No. 60950-1, UL 60950-1)","description":"SITOP PSU8200 48 V/20 A stabilized power supply input: 400-500 V 3 AC output: 48 V DC/20 A *Ex approval no longer available*","CSA approval":"Yes; cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259; cCSAus (CSA C22.2 No. 60950-1, UL 60950-1)","EAC approval":"Yes","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","In The Feeder":"Required: 3-pole connected miniature circuit breaker 10 ... 16 A characteristic C or circuit breaker 3RV2011-1DA10 (setting 3 A) or 3RV2711-1DD10 (UL 489)","Initial Value":"320 V","During Storage":"-40 ... +85 °C","Line Frequency":"45 ... 65 Hz","MTBF at 40 °C":"520 782 h","FM registration":"No","lifecycle_stage":"current","During Operation":"-25 ... +70 °C; With natural convection","During Transport":"-40 ... +85 °C","Fastening Method":"Snaps onto DIN rail EN 60715 35x15","Full-Scale Value":"575 V","I2t value maximum":"2.24 A²·s","Other Information":"Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)","ULhazloc approval":"No","Galvanic Isolation":"Safety extra-low output voltage Uout acc. to EN 60950-1 and EN 50178","Maximum Rated Value":"500 V","Minimum Rated Value":"400 V","protection class IP":"IP20","Bridging Of Equipment":"Yes; switchable characteristic","Efficiency In Percent":"94 %","Shipbuilding Approval":"DNV GL","Depth Of The Enclosure":"150 mm","For Auxiliary Contacts":"13, 14 (alarm signal), 15, 16 (Remote): 1 screw terminal each for 0.05 ... 2.5 mm²","Mechanical Accessories":"Device identification label 20 mm × 7 mm, TI-grey 3RT2900-1SB20","Response Delay Maximum":"0.1 s","Width Of The Enclosure":"135 mm","Height Of The Enclosure":"145 mm","Voltage Curve At Output":"Controlled, isolated DC voltage","For Emitted Interference":"EN 55022 Class B","Nippon Kaiji Kyokai (NK)":"No","Type Of Signal At Output":"Relay contact (NO contact, rating 60 V DC/ 0.3 A) for 48 V OK","Adjustable Output Voltage":"46 ... 56 V","For Interference Immunity":"EN 61000-6-2","cCSAus, Class 1, Division 2":"No","at rated input voltage 400 V":"2 A","at rated input voltage 500 V":"1.7 A","Supplied Active Power Typical":"960 W","Type Of Electrical Connection":"screw-type terminals","at output 1 at DC rated value":"48 V","For Mains Harmonics Limitation":"EN 61000-3-2","Type Of Output Voltage Setting":"via potentiometer; max. 960 W","Design Of Input Wide Range Input":"Yes","During NO-Load Operation Maximum":"4 W","Type Of The Power Supply Network":"3-phase AC","output voltage at DC rated value":"48 V","At Short-Circuit During Operation":"25 ms","Lloyds Register of Shipping (LRS)":"No","Design Of Short-Circuit Protection":"Alternatively, constant current characteristic approx. 22 A or latching shutdown","On Slow Fluctuation Of Ohm Loading":"0.2 %","Operating Resource Protection Class":"Class I","Design Of The Overvoltage Protection":"< 57.8 V","Display Version For Normal Operation":"Green LED for 48 V OK","On Slow Fluctuation Of Input Voltage":"0.1 %","At Short-Circuit During Operation Typical":"60 A","French marine classification society (BV)":"No","Relative Overall Tolerance Of The Voltage":"3 %","Operating Condition Of The Mains Buffering":"at Vin = 400 V","Product Function Output Voltage Adjustable":"Yes","Property Of The Output Short-Circuit Proof":"Yes","Galvanic Isolation Between Input And Output":"Yes","American Bureau of Shipping Europe Ltd. (ABS)":"No","environmental category according to IEC 60721":"Climate class 3K3, 5 … 95% no condensation","Display Version For Overload And Short Circuit":"LED yellow for \"overload\", LED red for \"latching shutdown\"","On Short-Circuiting During The Start-Up Typical":"24 A","Behavior Of The Output Voltage When Switching On":"minimal overshoot (< 3 %)","Overcurrent Overload Capability In Normal Operation":"overload capability 150 % Iout rated up to 5 s/min","current limitation of inrush current at 25 °C maximum":"13 A","Product Feature Of The Enclosure Housing Can Be Lined Up":"Yes","At Rated Output Voltage For Rated Value Of The Output Current Typical":"58 W","Number Of Parallel-Switched Equipment Resources For Increasing The Power":"2","Buffering Time For Rated Value Of The Output Current In The Event Of Power Failure Minimum":"10 ms","Relative Control Precision Of The Output Voltage With Rapid Fluctuation Of The Input Voltage By +/- 15% Typical":"1 %"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$332.74","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0700258536e9b31b72f7cf48e0fbe4bf.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1108810&mlfb=6EP3447-8SB00-0AY0"},"ai":{"faq":[{"question":"Does 6EP3447-8SB00-0AY0 have UL approval?","answer":"Yes, it carries cULus listing under UL 508 and CSA C22.2 No. 107.1, File E197259, plus cCSAus to UL 60950-1 and CSA C22.2 No. 60950-1. Also CE, EAC, and DNV GL marine certified. No ATEX or IECEx."},{"question":"How much clearance is needed around 6EP3447-8SB00-0AY0?","answer":"40 mm free space above and below the unit for natural convection airflow; 0 mm clearance required on the left and right sides, so it can be mounted flush against adjacent DIN rail modules."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6EP3447-8SB00-0AY0","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/6EP3447-8SB00-0AY0 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}}