6EP1621-2BA00

**6EP1621-2BA00** 

**Data sheet** 

SITOP POWER/DC/DC/24V/12V/2.5A 

********** spare part ********* SITOP 2.5 A, DC/DC converter stabilized power supply input: 24 V DC output: 12 V DC/2.5 A 

## **input** 

||SITOP POWER/DC/DC/24V/12V/2.5A<br>********** spare part ********* SITOP 2.5 A, DC/DC converter stabilized power<br>supply input: 24 V DC output: 12 V DC/2.5 A|
|---|---|
|**input**||
|type of thepower supplynetwork|DC voltage PELV/SELV|
|supplyvoltage at DC|24 V|
|input voltage at DC|18.5 ... 30.2 V|
|wide range input|No|
|input current||
|● at rated input voltage 24 V|2.5 A|
|current limitation of inrush current at 25 °C maximum|20 A|
|duration of inrush current limitingat 25 °C||
|● typical|5 ms|
|fuseprotection type|not accessible|
|fuse protection type in the feeder|Recommended miniature circuit breaker: 10 A characteristic B|
|**output**<br>~~|~~||
|voltage curve at output<br>~~|~~|Controlled, isolated DC voltage<br>~~|~~|
|output voltage at DC rated value|12 V|
|output voltage||
|● at output 1 at DC rated value|12 V|
|output voltage adjustable|Yes; viapotentiometer|
|adjustable output voltage|12 ... 14 V; max. 120 W|
|relative overall tolerance of the voltage|3 %|
|relative controlprecision of the output voltage||
|● on slow fluctuation of input voltage|0.1 %|
|● on slow fluctuation of ohm loading|0.4 %|
|residual ripple||
|● maximum|100 mV|
|● typical|50 mV|
|voltagepeak||
|● maximum|200 mV|
|● typical|50 mV|
|displayversion for normal operation|Green LED for 12 V OK|
|response delaymaximum|0.5 s|
|voltage increase time of the output voltage||
|● typical|300 ms|
|output current||
|● rated value|2.5 A|
|● rated range|0 ... 2.5 A|
|short-term overload current||
|● on short-circuitingduringthe start-uptypical|3.3 A|
|● at short-circuit during operation typical|3.3 A|



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||constant overload current|||
|---|---|---|---|
||● on short-circuitingduringthe start-uptypical|3.3 A||
||● at short-circuit duringoperation typical|3.3 A||
||bridgingof equipment|Yes||
||number of parallel-switched equipment resources for increasing<br>the power|2||
||**efficiency**|||
||efficiencyinpercent|83 %||
||power loss[W]|||
||● at rated output voltage for rated value of the output<br>current typical|6.1 W||
||**closed-loop control**|||
||relative control precision of the output voltage with rapid<br>fluctuation of the input voltage by+/- 15% typical|0.5 %||
||relative control precision of the output voltage load step of<br>resistive load 50/100/50 % typical|3 %||
||settingtime|||
||● load step50 to 100% typical|5 ms||
||● load step100 to 50% typical|2 ms||
||settingtime|||
||● maximum|5 ms||
||**protection and monitoring**|||
||design of the overvoltageprotection|< 24 V||
||propertyof the output short-circuitproof|Yes||
||design of short-circuitprotection|Constant current characteristic approx. 3.2 A||
||response value current limitation|3 ... 3.6 A||
||● typical|3.3 A||
||enduringshort circuit current RMS value|||
||● typical|3.2 A||
||displayversion for overload and short circuit|LED red for "overload"||
||**safety**|||
||galvanic isolation between input and output|Yes||
||galvanic isolation|Safetyextra low output voltage Vout accordingto EN 60950-1||
||operatingresourceprotection class|Class II||
||protection class IP|IP20||
||**EMC**|||
||standard|||
||● for emitted interference|EN 55022 Class B||
||● for mains harmonics limitation|-||
||● for interference immunity|EN 61000-6-2||
||**standards, specifications, approvals**|||
||certificate of suitability|||
||● CE marking|Yes||
||● UL approval|Yes; cCSAus(UL 508, CSA22.2-107, UL60950-1, CSA22.2-60950-1)||
||● EAC approval|Yes||
||● NEC Class 2|No||
||type of certification|||
||● CB-certificate|No||
||MTBF at 40 °C|563 793 h||
||**standards, specifications, approvals hazardous environments**|||
||certificate of suitability|||
||● IECEx|No||
||● ATEX|No||
||● ULhazloc approval|No||
||● FM registration|No||
||**standards, specifications, approvals marine classification**|||
||shipbuildingapproval|No||
||Marine classification association|||
||● American Bureau of ShippingEurope Ltd.(ABS)|No||
||● French marine classification society (BV)|No||



Subject to change without notice © Copyright Siemens 

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6/5/2026 

|● Det Norske Veritas(DNV)|No|No|No|
|---|---|---|---|
|● Lloyds Register of Shipping (LRS)|No|||
|**ambient conditions**||||
|ambient temperature||||
|● duringoperation|0 ... 60 °C; with natural convection|||
|● duringtransport|-40 ... +85 °C|||
|● duringstorage|-40 ... +85 °C|||
|environmental categoryaccordingto IEC 60721|Climate class 3K3, 5 ... 95% no condensation|||
|**connection method**||||
|type of electrical connection|screw terminal|||
|● at input|+, -: 1 screw terminal each for 0.5 ... 2.5 mm²|||
|● at output|+, -: 2 screw terminals each for 0.5 ... 2.5 mm²|||
|● for auxiliarycontacts|-|||
|**mechanical data**||||
|width × height × depth of the enclosure|32.5 × 125 × 125 mm|||
|installation width × mountingheight|32.5 mm × 225 mm|||
|required spacing||||
|● top|50 mm|||
|● bottom|50 mm|||
|● left|0 mm|||
|● right|0 mm|||
|fasteningmethod|Snaps onto DIN rail EN 60715 35x7.5/15|||
|● DIN-rail mounting|Yes|||
|● S7 rail mounting|No|||
|● wall mounting|No|||
|housingcan be lined up|Yes|||
|net weight|0.32 kg|||
|**further information internet links**||||
|internet link||||
|● to website: IndustryMall|https://mall.industry.siemens.com|||
|● to webpage: selection aid TIA Selection Tool|https://www.siemens.com/tstcloud|||
|● to website: CAx-Download-Manager|https://siemens.com/cax|||
|● to website: IndustryOnline Support|https://support.industry.siemens.com|||
|**additional information**||||
|other information|Specifications at rated input voltage and ambient temperature +25 °C (unless<br>otherwise specified)|||
|**security information**||||
|security information|Siemens provides products and solutions with industrial cybersecurity functions<br>that support the secure operation of plants, systems, machines and networks.<br>In order to protect plants, systems, machines and networks against cyber<br>threats, it is necessary to implement - and continuously maintain - a holistic,<br>state-of-the-art industrial cybersecurity concept. Siemens’ products and<br>solutions constitute one element of such a concept. Customers are responsible<br>for preventing unauthorized access to their plants, systems, machines and<br>networks. Such systems, machines and components should only be connected<br>to an enterprise network or the internet if and to the extent such a connection is<br>necessary and only when appropriate security measures (e.g. firewalls and/or<br>network segmentation) are in place. For additional information on industrial<br>cybersecurity measures that may be implemented, please visit<br>www.siemens.com/cybersecurity-industry. Siemens’ products and solutions<br>undergo continuous development to make them more secure. Siemens strongly<br>recommends that product updates are applied as soon as they are available<br>and that the latest product versions are used. Use of product versions that are<br>no longer supported, and failure to apply the latest updates may increase<br>customer’s exposure to cyber threats. To stay informed about product updates,<br>subscribe to the Siemens Industrial Cybersecurity RSS Feed under<br>https://www.siemens.com/cert.(V4.7)|||
|**Classifications**||||
|||**Version**|**Classification**|
||eClass<br>eClass<br>eClass<br>eClass|14<br>12<br>9.1<br>9|27-04-07-01<br>27-04-07-01<br>27-04-07-01<br>27-04-07-01|



|● Det Norske Veritas(DNV)|No|No|No|
|---|---|---|---|
|● Lloyds Register of Shipping (LRS)|No|||
|**ambient conditions**||||
|ambient temperature||||
|● duringoperation|0 ... 60 °C; with natural convection|||
|● duringtransport|-40 ... +85 °C|||
|● duringstorage|-40 ... +85 °C|||
|environmental categoryaccordingto IEC 60721|Climate class 3K3, 5 ... 95% no condensation|||
|**connection method**||||
|type of electrical connection|screw terminal|||
|● at input|+, -: 1 screw terminal each for 0.5 ... 2.5 mm²|||
|● at output|+, -: 2 screw terminals each for 0.5 ... 2.5 mm²|||
|● for auxiliarycontacts|-|||
|**mechanical data**||||
|width × height × depth of the enclosure|32.5 × 125 × 125 mm|||
|installation width × mountingheight|32.5 mm × 225 mm|||
|required spacing||||
|● top|50 mm|||
|● bottom|50 mm|||
|● left|0 mm|||
|● right|0 mm|||
|fasteningmethod|Snaps onto DIN rail EN 60715 35x7.5/15|||
|● DIN-rail mounting|Yes|||
|● S7 rail mounting|No|||
|● wall mounting|No|||
|housingcan be lined up|Yes|||
|net weight|0.32 kg|||
|**further information internet links**||||
|internet link||||
|● to website: IndustryMall|https://mall.industry.siemens.com|||
|● to webpage: selection aid TIA Selection Tool|https://www.siemens.com/tstcloud|||
|● to website: CAx-Download-Manager|https://siemens.com/cax|||
|● to website: IndustryOnline Support|https://support.industry.siemens.com|||
|**additional information**||||
|other information|Specifications at rated input voltage and ambient temperature +25 °C (unless<br>otherwise specified)|||
|**security information**||||
|security information|Siemens provides products and solutions with industrial cybersecurity functions<br>that support the secure operation of plants, systems, machines and networks.<br>In order to protect plants, systems, machines and networks against cyber<br>threats, it is necessary to implement - and continuously maintain - a holistic,<br>state-of-the-art industrial cybersecurity concept. Siemens’ products and<br>solutions constitute one element of such a concept. Customers are responsible<br>for preventing unauthorized access to their plants, systems, machines and<br>networks. Such systems, machines and components should only be connected<br>to an enterprise network or the internet if and to the extent such a connection is<br>necessary and only when appropriate security measures (e.g. firewalls and/or<br>network segmentation) are in place. For additional information on industrial<br>cybersecurity measures that may be implemented, please visit<br>www.siemens.com/cybersecurity-industry. Siemens’ products and solutions<br>undergo continuous development to make them more secure. Siemens strongly<br>recommends that product updates are applied as soon as they are available<br>and that the latest product versions are used. Use of product versions that are<br>no longer supported, and failure to apply the latest updates may increase<br>customer’s exposure to cyber threats. To stay informed about product updates,<br>subscribe to the Siemens Industrial Cybersecurity RSS Feed under<br>https://www.siemens.com/cert.(V4.7)|||
|**Classifications**||||
|||**Version**|**Classification**|
||eClass<br>eClass<br>eClass<br>eClass|14<br>12<br>9.1<br>9|27-04-07-01<br>27-04-07-01<br>27-04-07-01<br>27-04-07-01|



||**Version**|**Classification**||
|---|---|---|---|
|eClass|14|27-04-07-01||
|eClass|12|27-04-07-01||
|eClass|9.1|27-04-07-01||
|eClass|9|27-04-07-01||



Subject to change without notice © Copyright Siemens 

6EP16212BA00 Page 3/4 

6/5/2026 

eClass 8 27-04-90-02 eClass 7.1 27-04-90-02 eClass 6 27-04-90-02 ETIM 10 EC002540 ETIM 9 EC002540 ETIM 8 EC002540 ETIM 7 EC002540 IDEA 4 4130 UNSPSC 15 39-12-10-04 ~~pT~~ **Approvals Certificates General Product Approval** Manufacturer DeclaraChina RoHS tion ~~—~~ C ~~E~~ 

**last modified:** 

3/26/2026 

Subject to change without notice © Copyright Siemens 

6EP16212BA00 Page 4/4 

6/5/2026