3SK1111-1AW20

**3SK1111-1AW20** 

**Data sheet** 

SIRIUS safety relay Basic unit Standard series Relay enabling circuits 3 NO contacts plus Relay signaling circuit 1 NC contact Us = 110 - 240 V AC/DC 50/60 Hz screw terminal 

||SIRIUS safety relay Basic unit Standard series Relay enabling circuits 3 NO<br>contacts plus Relay signaling circuit 1 NC contact Us = 110 - 240 V AC/DC 50/60<br>Hz screw terminal|
|---|---|
|**product brand name**|SIRIUS|
|**product category**|Safetyrelays|
|**product designation**|safetyrelays|
|**design of theproduct**|Relayenablingcircuits|
|**product type designation**|3SK1|
|**product line**|Standard basic unit|
|**Product Function**<br>~~a~~||
|**product functionparameterizable**<br>~~a~~|Sensor floating/ monitored start / automatic start<br>~~a~~|
|**product function**||
|● automatic start|Yes|
|● light barrier monitoring|No|
|●protective door monitoring|Yes|
|● magneticallyoperated switch monitoringNC-NO|No|
|● magneticallyoperated switch monitoringNC-NC|Yes|
|● laser scanner monitoring|No|
|● light arraymonitoring|No|
|● EMERGENCY OFF function|Yes|
|● monitored start-up|Yes|
|●pressure-sensitive mat monitoring|No|
|**product feature cross-circuit-proof**|Yes|
|**suitability for interactionpress control**|No|
|**suitability for operation device connector 3ZY12**|No|
|**suitability for use**||
|● monitoringof floatingsensors|Yes|
|● monitoringof non-floatingsensors|No|
|●position switch monitoring|Yes|
|● EMERGENCY-OFF circuit monitoring|Yes|
|● opto-electronicprotection device monitoring|No|
|● magneticallyoperated switch monitoring|No|
|● safetyswitch|Yes|
|● safety-related circuits|Yes|
|**General technical data**<br>~~ee~~||
|certificate of suitabilityUL approval<br>~~ee~~|Yes<br>~~ee~~|
|**power loss[W] maximum**|2.5 W|
|**insulation voltage rated value**|300 V|
|**degree ofpollution**|3|
|**overvoltage category**|3|
|**surge voltage resistance rated value**|4 000 V|
|protection class IP of the enclosure|IP20|



3SK11111AW20 Page 1/6 

Subject to change without notice © Copyright Siemens 

5/29/2026 

|**shock resistance**|10g/ 11 ms|
|---|---|
|**vibration resistance according to IEC 60068-2-6**|5 ... 500 Hz: 0.75 mm|
|**operating frequency maximum**|360 1/h|
|**reference code according to IEC 81346-2**|F|
|**Substance Prohibitance(day/month/year)**|11/05/2012|
|**SVHC substance name**|Lead CAS-No. 7439-92-1<br>Lead monoxide (lead oxide) CAS-No. 1317-36-8<br>2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one CAS-No. 71868-<br>10-5<br>Melamine CAS-No. 108-78-1<br>6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol CAS-No. 119-47-1<br>4,4'-isopropylidenediphenol(Bisphenol A, BPA)CAS-No. 80-05-7|
|**Net Weight**|0.258 kg|
|**Ambient conditions**||
|installation altitude at height above sea level maximum|4 000 m|
|● note|Derating, see Product Notification 109792701|
|**ambient temperature**||
|● duringoperation|-25 ... +60 °C|
|● duringstorage|-40 ... +80 °C|
|relative humidityduringoperation|10 ... 95 %|
|air pressure accordingto SN 31205|900 ... 1 060 hPa|
|**Electromagnetic compatibility**||
|**installation environment regarding EMC**|This product is suitable for Class A environments only. In household<br>environments, this device can cause unwanted radio interference. The user is<br>required to implement appropriate measures in this case.|
|**EMC emitted interference**|IEC 60947-5-1, Class A|
|**Safety related data**||
|product function suitable for safetyfunction|Yes|
|**safe state**|Safetyoutputs switched off|
|**test wear-related service life necessary**|Yes|
|**function test interval maximum**|1 a|
|**stop category according to IEC 60204-1**|0|
|IEC 62061||
|SIL Claim Limit(subsystem)accordingto EN 62061|3|
|**Safety Integrity Level(SIL)**||
|**● according to IEC 62061**|SIL 3|
|● at single-channel evaluation accordingto IEC 62061|1|
|● at 2-channel evaluation accordingto IEC 62061|3|
|**PFHD with high demand rate according to IEC 62061**|0,0000000015|
|ISO 13849||
|categoryaccordingto EN ISO 13849-1|4|
|**performance level(PL)**||
|**● according to ISO 13849-1**|PL e|
|● at single-channel evaluation accordingto ISO 13849-1|c|
|● at 2-channel evaluation accordingto ISO 13849-1|e|
|**category**||
|**● according to ISO 13849-1**|4|
|● at 2-channel evaluation accordingto ISO 13849-1|4|
|**overdimensioning according to ISO 13849-2 necessary**|No|
|IEC 61508||
|**Safety Integrity Level(SIL)**||
|● accordingto IEC 61508|3|
|● at single-channel evaluation accordingto IEC 61508|1|
|● at 2-channel evaluation accordingto IEC 61508|3|
|**safety device type according to IEC 61508-2**|Type A|
|**Safe failure fraction(SFF)**|99 %|
|**hardware fault tolerance**||
|● accordingto IEC 61508|1|
|● at single-channel evaluation accordingto IEC 61508|0|
|● at 2-channel evaluation accordingto IEC 61508|1|
|**T1 value**||



3SK11111AW20 Page 2/6 

Subject to change without notice © Copyright Siemens 

5/29/2026 

|● of service life accordingto IEC 61508|20 a|
|---|---|
|● for proof test interval or service life according to IEC<br>61508|20 a|
|Electrical Safety||
|**touch protection against electrical shock**|finger-safe|
|**Short-circuit protection**||
|**design of the fuse link**||
|● for short-circuit protection of the NO contacts of the relay<br>outputs required|gL/gG: 6A or circuit breaker type A: 3A or circuit breaker type B: 2A or circuit<br>breaker type C: 1A|
|● for short circuit protection of the NC contacts of the relay<br>outputs required|Diazed or Neozed fuses, operating class gL/gG: 6 A or MCB type A: 2 A or<br>MCB type B: 2 A or MCB type C: 1 A|
|**Inputs**||
|**design of input**||
|● cascadinginput/functional switching|No|
|● feedback input|Yes|
|● start input|Yes|
|pulse duration of the sensor input minimum|150 ms|
|number of sensor inputs 1-channel or 2-channel|1|
|**Outputs**||
|**number of outputs as contact-affected switching element**||
|● as NC contact||
|— for signalingfunction instantaneous contact|1|
|● as NO contact||
|— safety-related instantaneous contact|3|
|— safety-related delayed switching|0|
|**mechanical service life(operating cycles) typical**|10 000 000|
|**thermal current of the switching element with contacts**<br>**maximum**|5 A|
|**switching capacity current of the NO contacts of the relay**<br>**outputs at DC-13**||
|● at 24 V|5 A|
|● at 115 V|0.2 A|
|● at 230 V|0.1 A|
|**switching capacity current of the NO contacts of the relay**<br>**outputs at AC-15**||
|● at 115 V|5 A|
|● at 230 V|5 A|
|**switching capacity current of the NC contacts of the relay**<br>**outputs at DC-13**||
|● at 24 V|1 A|
|● at 115 V|0.2 A|
|● at 230 V|0.1 A|
|**switching capacity current of the NC contacts of the relay**<br>**outputs at AC-15**||
|● at 24 V|2 A|
|● at 115 V|1.5 A|
|● at 230 V|1.5 A|
|**total current maximum**|12 A|
|**operational current at 17 V minimum**|5 mA|
|**Times**||
|**make time with automatic start**||
|● typical|110 ms|
|● at DC maximum|130 ms|
|● at AC maximum|130 ms|
|**make time with automatic start afterpower failure**||
|● typical|110 ms|
|● maximum|130 ms|
|**make time with monitored start**||
|● typical|15 ms|
|● maximum|15 ms|
|**backslide delay time after opening of the safety circuits**|10 ms|



3SK11111AW20 Page 3/6 

Subject to change without notice © Copyright Siemens 

5/29/2026 

|**typical**|**typical**||
|---|---|---|
|**backslide delay time in the event ofpower failure**|||
|● typical||200 ms|
|● maximum||300 ms|
|**recovery time after opening of the safety circuits typical**||10 ms|
|**recovery time afterpower failure typical**||0.32 s|
|**pulse duration**|||
|● of the ON pushbutton input minimum||0.015 s|
|**Control circuit/ Control**<br>~~a~~|||
|**type of voltage of the control supply voltage**<br>~~a~~||AC/DC<br>~~a~~|
|**control supply voltage at AC**|||
|● at 50 Hz rated value||110 ... 240 V|
|● at 60 Hz rated value||110 ... 240 V|
|**control supply voltage frequency**|||
|**● 1 rated value**||50 Hz|
|**● 2 rated value**||60 Hz|
|**control supply voltage at DC rated value**||110 ... 240 V|
|**operating range factor control supply voltage rated value of**<br>**magnet coil at DC**|||
|● initial value||0.85|
|● full-scale value||1.1|
|**operating range factor control supply voltage rated value of**<br>**magnet coil at AC**|||
|● at 50 Hz||0.85 ... 1.1|
|● at 60 Hz||0.85 ... 1.1|
|**Installation/ mounting/ dimensions**<br>~~a~~|||
|**mounting position**<br>~~a~~||any<br>~~a~~|
|**fastening method**||screw and snap-on mounting|
|**height**||100 mm|
|**width**||22.5 mm|
|**depth**||121.5 mm|
|**required spacing**|||
|● forgrounded parts at the side||5 mm|
|**Connections/ Terminals**<br>~~a~~|||
|**type of electrical connection**<br>~~a~~||screw terminal<br>~~a~~|
|**wire length**|||
|● for total of all sensor circuits with Cu 1.5 mm² and 150<br>nF/km maximum||2 000 m|
|**type of connectable conductor cross-sections**|||
|● solid||1x(0.5 ... 2.5 mm²), 2x(1.0 ... 1.5 mm²)|
|● finelystranded with core endprocessing||1x(0.5 ... 2.5 mm²), 2x(0.5 ... 1.0 mm²)|
|● for AWG cables solid||1x(20 ... 14), 2x(18 ... 16)|
|● for AWG cables stranded<br>~~re~~||1x(20 ... 16), 2x(20 ... 16)<br>~~re~~|
|**type of electrical connection plug-in socket**<br>~~re~~||No<br>~~re~~|
|**Approvals Certificates**|||
|**Environment**|**General Product Approval**||



3SK11111AW20 Page 4/6 

Subject to change without notice © Copyright Siemens 

5/29/2026 

|**Maritime application**||**other**||
|---|---|---|---|
|=<br>tee|uy|Confirmation<br>~~—~~|Confirmation|
|**Railway**||||
|Confirmation||||



~~e~~ **Further information** ~~e~~ **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/ic10 **Industry Mall (Online ordering system)** https://mall.industry.siemens.com/mall/en/en/Catalog/product?mlfb=3SK1111-1AW20 **Cax online generator** https://support.automation.siemens.com/WW/CAXorder/default.aspx?lang=en&mlfb=3SK1111-1AW20 **Service&Support (Manuals, Certificates, Characteristics, FAQs,...)** https://support.industry.siemens.com/cs/ww/en/ps/3SK1111-1AW20 **Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, EPLAN macros, ...)** https://www.automation.siemens.com/bilddb/cax_de.aspx?mlfb=3SK1111-1AW20&lang=en 

3SK11111AW20 Page 5/6 

Subject to change without notice © Copyright Siemens 

5/29/2026 

**==> picture [394 x 334] intentionally omitted <==**

**----- Start of picture text -----**<br>
poo oo odo 4-4-44-4-4--4-4-4-4---<br>-K |<br>|<br>|<br>|<br>|<br>|<br>|<br>Logic<br>|<br>|<br>Autostart / Monitored Start<br>ee ee ee<br>|<br>|<br>|<br>|<br>|<br>oe Soe _ _ _ —_<br>F/S<br>A1+ T1 IN1 T2 IN2 T4 IN 13 23 33 41<br>2- 14 24 34 42<br>A<br>**----- End of picture text -----**<br>


**last modified:** 

5/26/2026 

3SK11111AW20 Page 6/6 

Subject to change without notice © Copyright Siemens 

5/29/2026