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Siemens 3SK1121-1AB40

Safety Technology

MPN: 3SK1121-1AB40
Category: Safety Technology

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What is the Siemens 3SK1121-1AB40?

Safety Technology

Specifications

Product Function

Technical Product Detail Page	https://i.siemens.com/1P3SK1121-1AB40
product function parameterizable	sensor floating / sensor non-floating, monitored start-up / automatic start, 1-channel / 2-channel sensor connection, cross-circuit detection, startup testing, antivalent sensors, 2-hand switches
product function — automatic start	Yes
product function — light barrier monitoring	Yes
product function — protective door monitoring	Yes
product function — magnetically operated switch monitoring NC-NO	Yes
product function — magnetically operated switch monitoring NC-NC	Yes
product function — laser scanner monitoring	Yes
product function — light array monitoring	Yes
product function — EMERGENCY OFF function	Yes
product function — monitored start-up	Yes
product function — pressure-sensitive mat monitoring	No
product feature cross-circuit-proof	Yes
suitability for interaction press control	Yes
suitability for operation device connector 3ZY12	Yes
suitability for use — monitoring of floating sensors	Yes
suitability for use — monitoring of non-floating sensors	Yes
suitability for use — position switch monitoring	Yes
suitability for use — EMERGENCY-OFF circuit monitoring	Yes
suitability for use — opto-electronic protection device monitoring	Yes
suitability for use — magnetically operated switch monitoring	Yes
suitability for use — safety-related circuits	Yes

General technical data

certificate of suitability UL approval	Yes
product feature protective coating on printed-circuit board	No
power loss [W] maximum	2 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	10 g / 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 Lead monoxide (lead oxide) CAS-No. 1317-36-8 2-methyl-1-(4-methylthiophenyl)-2-morpholinopropan-1-one CAS-No. 71868-10-5 Melamine CAS-No. 108-78-1 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol CAS-No. 119-47-1 4,4'-isopropylidenediphenol (Bisphenol A, BPA) CAS-No. 80-05-7
Net Weight	240.96 g

Ambient conditions

installation altitude at height above sea level maximum	4 000 m
note	Derating, see Product Notification 109792701
ambient temperature — during operation	-25 ... +60 °C
ambient temperature — 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	1 a
diagnostics test interval by internal test function maximum	600 s
stop category according to IEC 60204-1	0
SIL Claim Limit (subsystem) according to EN 62061	3
Safety Integrity Level (SIL) — according to IEC 62061	SIL 3
Safety Integrity Level (SIL) — at single-channel evaluation according to IEC 62061	1
Safety Integrity Level (SIL) — at 2-channel evaluation according to IEC 62061	3
PFHD with high demand rate according to IEC 62061	0,0000000025
category according to EN ISO 13849-1	4
performance level (PL) — according to ISO 13849-1	PL e
performance level (PL) — at single-channel evaluation according to ISO 13849-1	c
performance level (PL) — at 2-channel evaluation according to ISO 13849-1	e
category — according to ISO 13849-1	4
category — at 2-channel evaluation according to ISO 13849-1	4
overdimensioning according to ISO 13849-2 necessary	No
Safety Integrity Level (SIL) — according to IEC 61508	3
Safety Integrity Level (SIL) — at single-channel evaluation according to IEC 61508	1
Safety Integrity Level (SIL) — at 2-channel evaluation according to IEC 61508	3
safety device type according to IEC 61508-2	Type B
PFHD with high demand rate according to IEC 61508	0,0000000025
PFDavg with low demand rate according to IEC 61508	0.000007
Safe failure fraction (SFF)	99 %
hardware fault tolerance — according to IEC 61508	1
hardware fault tolerance — at single-channel evaluation according to IEC 61508	0
hardware fault tolerance — at 2-channel evaluation according to IEC 61508	1
T1 value — of service life according to IEC 61508	20 a
T1 value — for proof test interval or service life according to IEC 61508	20 a
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 outputs required	gL/gG: 6A or circuit breaker type A: 3A or circuit breaker type B: 2A or circuit breaker type C: 1A
design of the fuse link — for short circuit protection of the NC contacts of the relay outputs required	Diazed or Neozed fuses, operating class gL/gG: 6 A or MCB type A: 2 A or MCB type B: 2 A or MCB type C: 1 A

Inputs

design of input — cascading input/functional switching	Yes
design of input — feedback input	Yes
design of input — start input	Yes
pulse duration of the sensor input minimum	75 ms
number of sensor inputs 1-channel or 2-channel	1

Outputs

— for signaling function instantaneous contact	1
— 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 maximum	5 A
switching capacity current of the NO contacts of the relay outputs at DC-13 — at 24 V	5 A
switching capacity current of the NO contacts of the relay outputs at DC-13 — at 115 V	0.2 A
switching capacity current of the NO contacts of the relay outputs at DC-13 — at 230 V	0.1 A
switching capacity current of the NO contacts of the relay outputs at AC-15 — at 115 V	5 A
switching capacity current of the NO contacts of the relay outputs at AC-15 — at 230 V	5 A
switching capacity current of the NC contacts of the relay outputs at DC-13 — at 24 V	1 A
switching capacity current of the NC contacts of the relay outputs at DC-13 — at 115 V	0.2 A
switching capacity current of the NC contacts of the relay outputs at DC-13 — at 230 V	0.1 A
switching capacity current of the NC contacts of the relay outputs at AC-15 — at 24 V	2 A
switching capacity current of the NC contacts of the relay outputs at AC-15 — at 115 V	1.5 A
switching capacity current of the NC contacts of the relay outputs at AC-15 — 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 — at DC maximum	110 ms
make time with automatic start after power failure — typical	6 500 ms
make time with automatic start after power failure — maximum	6 500 ms
make time with monitored start — maximum	110 ms
backslide delay time after opening of the safety circuits typical	40 ms
backslide delay time in the event of power failure — typical	30 ms
backslide delay time in the event of power failure — maximum	50 ms
recovery time after opening of the safety circuits typical	30 ms
recovery time after power failure typical	6.5 s
pulse duration — of the ON pushbutton input minimum	0.15 s

Control circuit/ Control

type of voltage of the control supply voltage	DC
control supply voltage at DC rated value	24 V
operating range factor control supply voltage rated value of magnet coil at DC — initial value	0.8
operating range factor control supply voltage rated value of magnet coil at DC — full-scale value	1.2

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	screw terminal
wire length — with Cu 1.5 mm² and 150 nF/km per sensor circuit maximum	4 000 m
type of connectable conductor cross-sections — solid	1x (0.5 ... 2.5 mm²), 2x (1.0 ... 1.5 mm²)
type of connectable conductor cross-sections — finely stranded with core end processing	1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.0 mm²)
type of connectable conductor cross-sections — for AWG cables solid	1x (20 ... 14), 2x (18 ... 16)
type of connectable conductor cross-sections — for AWG cables stranded	1x (20 ... 16), 2x (20 ... 16)
type of electrical connection plug-in socket	No

Downloads & documentation

Official documents from Siemens, downloaded directly from the manufacturer.

Data sheets & manuals

Product data sheet 3SK1121-1AB40PDF

3SK1121-1AB40: frequently asked questions

When can 3SK1121-1AB40 be shipped?

3SK1121-1AB40 is in stock and typically ships within 1 business day via UPS, DHL or FedEx, worldwide.

Can I pick up 3SK1121-1AB40 in person?

Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.

Is express delivery available?

Yes — alongside standard UPS, DHL and FedEx shipping, express (next-day) delivery is available at checkout for in-stock items like 3SK1121-1AB40.

My factory is down and I need this urgently — can you help?

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