5ST3021

**5ST3021** 

**Data sheet** 

Fault signal contact, 2 NO for miniature circuit breaker 5SL, 5SY, 5SP RCBO 5SU1, FI 5SV (for 5SU1 handle coupler 5ST3805-1 is required) 

|r<br>Figure similar<br>i|Fault signal contact, 2 NO for miniature circuit breaker 5SL, 5SY, 5SP RCBO<br>5SU1, FI 5SV (for 5SU1 handle coupler 5ST3805-1 is required)<br>i|
|---|---|
|**Model**<br>~~|~~||
|**product brand name**<br>~~|~~|SENTRON<br>~~|~~|
|**product designation**|Fault signal contact|
|**design of theproduct**|Mountable|
|**design of theproduct factory mounted**|No|
|**electrical endurance(operating cycles) typical**|10 000|
|**Voltage**<br>~~|~~||
|insulation voltage rated value<br>~~|~~|440 V<br>~~|~~|
|surge voltage resistance rated value|4 kV|
|**Current**<br>~~ee~~||
|**operational current at DC rated value**<br>~~ee~~|0.01 A<br>~~ee~~|
|**Supply voltage**<br>~~|~~||
|**supply voltage at DC rated value**<br>~~|~~|~~|~~|
|● minimum|12 V|
|**operating voltage**||
|● rated value|400 V|
|● at AC rated value minimum|12 V|
|● at DC rated value minimum|12 V|
|**protection class IP**|IP20|
|**Control current**<br>~~|~~||
|type of voltage of control voltage<br>~~|~~|AC/DC<br>~~|~~|
|**Product details**<br>~~|~~||
|**product component**<br>~~|~~|~~|~~|
|**● fault signal contact**|Yes|
|**number of fault signal contacts**|1|
|**number of NC contacts**|0|
|**number of NO contacts**|2|
|**number of CO contacts**|0|
|**product extension can be mounted**|Universal|
|**product extension**|Fault signal contact|
|**Connections**<br>~~|~~||
|**connectable conductor cross-section**<br>~~|~~|~~|~~|
|● minimum|0.5 mm²|
|● maximum|2.5 mm²|
|**AWG number as coded connectable conductor cross**<br>**section**||
|● minimum|24|
|● maximum|12|



5ST3021 Page 1/5 

Subject to change without notice © Copyright Siemens 

6/2/2026 

|**tightening torque with screw-type terminals**||||||
|---|---|---|---|---|---|
|● maximum||0.5 N·m||||
|**Mechanical Design**<br>~~a~~||||||
|**height**||90 mm||||
|**width**||9 mm||||
|**depth**||70 mm||||
|**number of modular width units**||1||||
|**Net Weight**||63g||||
|**Environmental conditions**<br>~~a~~||||||
|**standard**||IEC/EN60947-5-1; IEC/EN62019||||
|**ambient temperature during operation**||||||
|● minimum||-25 °C||||
|● maximum||55 °C||||
|ambient temperature duringstorage minimum||-40 °C||||
|**Approvals Certificates**<br>~~a~~||||||
|**Environment**||||**General Product Approval**||
|Environmental Con-<br>Environmental Con-||||||
|firmations<br>firmations<br>~~ER~~D|||||“|
|**General Product Approval**||||||
|Miscellaneous|[HT||Confirmation<br>=—S—<sSX«E|||
|**General Product Ap-**<br>**proval**<br>**Maritime application**|||**other**|||
|cA|me<br>ta||Fee)|Confirmation<br>~~— ~~|Miscellaneous<br> ~~—~~|
|**Railway**||||||
|Special Test Certific-||||||
|ate||||||
|**Further information**<br>~~a~~||||||
|**Information on the packaging**||||||
|https://support.industry.siemens.com/cs/ww/en/view/109813875||||||
|**Information for data generation and storage**||||||
|https://support.industry.siemens.com/cs/ww/en/view/109995012||||||
|**Information- and Downloadcenter (Catalogs, Brochures,…)**||||||
|https://www.siemens.com/lowvoltage/catalogs||||||
|**Industry Mall (Online ordering system)**||||||
|https://mall.industry.siemens.com/mall/en/en/Catalog/product?mlfb=5ST3021||||||
|**Service&Support (Manuals, Certificates, Characteristics, FAQs,...)**||||||
|https://support.industry.siemens.com/cs/ww/en/ps/5ST3021||||||
|**Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, ...)**||||||
|https://www.automation.siemens.com/bilddb/cax_en.aspx?mlfb=5ST3021||||||
|**CAx-Online-Generator**||||||
|https://www.siemens.com/cax||||||
|**Tender specifications**||||||
|https://www.siemens.com/specifications||||||
|**Characteristic curves**||||||
|https://curves.simaris.siemens.com/curves/<mmp_prod_noCOMP="HAUPT"></mmp_prod__no>||||||



5ST3021 Page 2/5 

Subject to change without notice © Copyright Siemens 

6/2/2026 

**==> picture [511 x 730] intentionally omitted <==**

**----- Start of picture text -----**<br>
-K<br>13 23<br>14 24<br>**----- End of picture text -----**<br>


5ST3021 Page 3/5 

Subject to change without notice © Copyright Siemens 

6/2/2026 

**==> picture [456 x 340] intentionally omitted <==**

**----- Start of picture text -----**<br>
13 14<br>23 24<br>last modified: 5/5/2026 G<br>**----- End of picture text -----**<br>


5ST3021 Page 4/5 

Subject to change without notice © Copyright Siemens 

6/2/2026 

5ST3021 Page 5/5 

Subject to change without notice © Copyright Siemens 

6/2/2026