Data sheet 3SK1111-2AW20

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 Spring-type terminal (push-in)

product brand name SIRIUS

product category Safety relays
product designation safety relays
design of the product Relay enabling circuits
product type designation 3SK1
product line Standard basic unit
Product Function
product function parameterizable Sensor floating / monitored start / automatic start
product function
● automatic start Yes
● light barrier monitoring No
● protective door monitoring Yes
● magnetically operated switch monitoring NC-NO No
● magnetically operated switch monitoring NC-NC Yes
● laser scanner monitoring No
● light array monitoring No
● EMERGENCY OFF function Yes
● monitored start-up Yes
● pressure-sensitive mat monitoring No
suitability for interaction press control No
suitability for operation device connector 3ZY12 No
suitability for use
● monitoring of floating sensors Yes
● monitoring of non-floating sensors No
● position switch monitoring Yes
● EMERGENCY-OFF circuit monitoring Yes
● opto-electronic protection device monitoring No
● magnetically operated switch monitoring No
● safety switch Yes
● safety-related circuits Yes
General technical data
certificate of suitability UL approval Yes
product feature cross-circuit-proof Yes
power loss [W] maximum 2.5 W
insulation voltage rated value 300 V
degree of pollution 3
overvoltage category 3
surge voltage resistance rated value 4 000 V
protection class IP of the enclosure IP20
shock resistance 10g / 11 ms

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 vibration resistance according to IEC 60068-2-6 5 ... 500 Hz: 0.75 mm
operating frequency maximum 360 1/h
mechanical service life (operating cycles) typical 10 000 000
thermal current of the switching element with contacts 5A
maximum
reference code according to IEC 81346-2 F
Substance Prohibitance (Date) 11/05/2012
SVHC substance name Lead - 7439-92-1
Lead monoxide (lead oxide) - 1317-36-8
2,2',6,6'-tetrabromo-4,4'-isopropylidenediphenol - 79-94-7
2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one - 71868-10-5
6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol - 119-47-1
4,4'-isopropylidenediphenol (Bisphenol A, BPA) - 80-05-7
Weight 0.261 kg
Ambient conditions
installation altitude at height above sea level maximum 4 000 m; Derating, see Product Notification 109792701
ambient temperature
● during operation -25 ... +60 °C
● during storage -40 ... +80 °C
relative humidity during operation 10 ... 95 %
air pressure according to SN 31205 900 ... 1 060 hPa
Electromagnetic compatibility
installation environment regarding EMC This product is suitable for Class A environments only. In household
environments, this device can cause unwanted radio interference. The user is
required to implement appropriate measures in this case.
EMC emitted interference IEC 60947-5-1, Class A
Safety related data
product function suitable for safety function Yes
safe state Safety outputs switched off
test wear-related service life necessary Yes
function test interval maximum 1a
stop category according to IEC 60204-1 0
IEC 62061
SIL Claim Limit (subsystem) according to EN 62061 3
Safety Integrity Level (SIL)
● according to IEC 62061 SIL 3
● at 2-channel evaluation according to IEC 62061 3
PFHD with high demand rate according to IEC 62061 1.5E-9 1/h
ISO 13849
category according to EN ISO 13849-1 4
performance level (PL)
● according to ISO 13849-1 PL e
● at 2-channel evaluation according to ISO 13849-1 e
category
● according to ISO 13849-1 4
● at 2-channel evaluation according to ISO 13849-1 4
overdimensioning according to ISO 13849-2 necessary No
IEC 61508
Safety Integrity Level (SIL)
● according to IEC 61508 3
● at single-channel evaluation according to IEC 61508 1
● at 2-channel evaluation according to IEC 61508 3
safety device type according to IEC 61508-2 Type A
PFHD with high demand rate according to IEC 61508 1.5E-9 1/h
Average probability of failure on demand (PFDavg) with low 1E-6 1/y
demand rate acc. to IEC 61508
PFDavg with low demand rate according to IEC 61508 1E-6
Safe failure fraction (SFF) 99 %
hardware fault tolerance
● according to IEC 61508 1
● at single-channel evaluation according to IEC 61508 0
● at 2-channel evaluation according to IEC 61508 1
T1 value

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 ● of service life according to IEC 61508 20 a
● for proof test interval or service life according to IEC 20 a
61508
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 gL/gG: 6A or circuit breaker type A: 3A or circuit breaker type B: 2A or circuit
outputs required breaker type C: 1A
● for short circuit protection of the NC contacts of the relay Diazed or Neozed fuses, operating class gL/gG: 6 A or MCB type A: 2 A or
outputs required MCB type B: 2 A or MCB type C: 1 A
Inputs
design of input
● cascading input/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 signaling function instantaneous contact 1
● as NO contact
— safety-related instantaneous contact 3
— safety-related delayed switching 0
switching capacity current of the NO contacts of the relay
outputs at DC-13
● at 24 V 5A
● at 115 V 0.2 A
● at 230 V 0.1 A
switching capacity current of the NO contacts of the relay
outputs at AC-15
● at 115 V 5A
● at 230 V 5A
switching capacity current of the NC contacts of the relay
outputs at DC-13
● at 24 V 1A
● at 115 V 0.2 A
● at 230 V 0.1 A
switching capacity current of the NC contacts of the relay
outputs at AC-15
● at 24 V 2A
● 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 after power 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
typical
backslide delay time in the event of power failure
● typical 200 ms
● maximum 300 ms
recovery time after opening of the safety circuits typical 10 ms

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 recovery time after power failure typical 0.32 s
pulse duration
● of the ON pushbutton input minimum 0.015 s
Control circuit/ Control
type of voltage of the control supply voltage AC/DC
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
magnet coil at DC
● initial value 0.85
● full-scale value 1.1
operating range factor control supply voltage rated value of
magnet coil at AC
● at 50 Hz 0.85 ... 1.1
● at 60 Hz 0.85 ... 1.1
Installation/ mounting/ dimensions
mounting position any
fastening method screw and snap-on mounting
height 100 mm
width 22.5 mm
depth 121.6 mm
required spacing
● for grounded parts at the side 5 mm
Connections/ Terminals
type of electrical connection spring-loaded terminal (push-in)
wire length
● for total of all sensor circuits with Cu 1.5 mm² and 150 2 000 m
nF/km maximum
type of connectable conductor cross-sections
● solid 1x (0.5 ... 1.5 mm²), 2x (0.5 ... 1.5 mm²)
● finely stranded with core end processing 1x (0.5 ... 1.0 mm²), 2x (0.5 ... 1.0 mm²)
● finely stranded without core end processing 1x (0.5 ... 1.5 mm²), 2x (0.5 ... 1.5 mm²)
● for AWG cables solid 1x (20 ... 16), 2x (20 ... 16)
● for AWG cables stranded 1x (20 ... 16), 2x (20 ... 16)
type of electrical connection plug-in socket No
Approvals Certificates
General Product Approval EMV

Functional Saftey Test Certificates Maritime application

Type Examination Cer- Type Test Certific-

tificate ates/Test Report

other Railway Environment

Confirmation Confirmation Environmental Con-

firmations

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Further information
Information on the packaging
https://support.industry.siemens.com/cs/ww/en/view/109813875
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=3SK1111-2AW20
Cax online generator
http://support.automation.siemens.com/WW/CAXorder/default.aspx?lang=en&mlfb=3SK1111-2AW20
Service&Support (Manuals, Certificates, Characteristics, FAQs,...)
https://support.industry.siemens.com/cs/ww/en/ps/3SK1111-2AW20
Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, EPLAN macros, ...)
http://www.automation.siemens.com/bilddb/cax_de.aspx?mlfb=3SK1111-2AW20&lang=en

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 F/S
A1+

IN1

IN2
T1

T2

T4

IN

13

23

33

41
-K

Logic
Autostart / Monitored Start
A2-

14

24

34

42

last modified: 4/2/2025

3SK11112AW20 Subject to change without notice

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