3SK1121-2CB42

Data sheet 3SK1121-2CB42 SIRIUS safety relay Basic unit Advanced series with time delay 0.5-30 s Relay enabling circuits 2 NO instantaneous 2 NO delayed Us = 24 V DC Spring-type terminal (push-in) product brand name SIRIUS product category Safety relays product designation safety relays design of the product Relay enabling circuits General technical data protection class IP of the enclosure IP20 touch protection against electrical shock finger-safe insulation voltage rated value 300 V ambient temperature ● during storage -40 ... +80 °C ● during operation -25 ... +60 °C air pressure according to SN 31205 90 ... 106 kPa relative humidity during operation 10 ... 95 % installation altitude at height above sea level maximum 4 000 m; Derating, see Product Notification 109792701 vibration resistance according to IEC 60068-2-6 5 ... 500 Hz: 0.75 mm shock resistance 10g / 11 ms surge voltage resistance rated value 4 000 V EMC emitted interference IEC 60947-5-1, Class A 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. overvoltage category 3 degree of pollution 3 reference code according to IEC 81346-2 F power loss [W] maximum 2.5 W number of sensor inputs 1-channel or 2-channel 1 design of the cascading yes type of the safety-related wiring of the inputs single-channel and two-channel product feature cross-circuit-proof Yes Safety Integrity Level (SIL) ● according to IEC 62061 3 ● according to IEC 61508 3 ● for delayed release circuit according to IEC 61508 SIL3 performance level (PL) ● according to ISO 13849-1 e ● for delayed release circuit according to ISO 13849-1 e category according to EN ISO 13849-1 4 Safe failure fraction (SFF) 99 % PFHD with high demand rate according to IEC 62061 3.7E-9 1/h PFDavg with low demand rate according to IEC 61508 7E-6 T1 value for proof test interval or service life according to 20 a 3SK11212CB42 Page 1/5 4/5/2024 Subject to change without notice © Copyright Siemens IEC 61508 hardware fault tolerance according to IEC 61508 1 safety device type according to IEC 61508-2 Type B Inputs/ Outputs number of outputs as contact-affected switching element ● as NO contact — safety-related instantaneous contact 2 — safety-related delayed switching 2 stop category according to IEC 60204-1 0/1 design of input ● cascading input/functional switching Yes ● feedback input Yes ● start input Yes type of electrical connection plug-in socket No operating frequency maximum 360 1/h switching capacity current ● of the NO contacts of the relay outputs — at DC-13 — at 24 V 3A — at 115 V 0.2 A — at 230 V 0.1 A — at AC-15 — at 115 V 3A — at 230 V 3A thermal current of the switching element with contacts maximum 5A total current maximum 12 A operational current at 17 V minimum 5 mA mechanical service life (operating cycles) typical 10 000 000 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 wire length ● with Cu 1.5 mm² and 150 nF/km per sensor circuit maximum 4 000 m make time with automatic start ● at DC maximum 110 ms make time with automatic start after power failure ● typical 6 500 ms ● maximum 6 500 ms make time with monitored start ● maximum backslide delay time after opening of the safety circuits typical 110 ms 40 ms backslide delay time in the event of power failure ● typical 30 ms ● maximum 40 ms adjustable OFF-delay time after opening of the safety circuits 0.5 ... 30 recovery time after opening of the safety circuits typical 30 ms recovery time after power failure typical 6.5 s pulse duration ● of the sensor input minimum 75 ms ● 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 0.8 ... 1.2 Installation/ mounting/ dimensions 3SK11212CB42 Page 2/5 4/5/2024 Subject to change without notice © Copyright Siemens mounting position any required spacing for grounded parts at the side 5 mm fastening method screw and snap-on mounting width 22.5 mm height 100 mm depth 121.6 mm Connections/ Terminals type of electrical connection spring-loaded terminal (push-in) 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) — without core end processing 1x (0.5 ... 1.5 mm²), 2x (0.5 ... 1.5 mm²) type of connectable conductor cross-sections for AWG cables ● solid 1x (20 ... 16), 2x (20 ... 16) ● stranded 1x (20 ... 16), 2x (20 ... 16) Product Function product function parameterizable sensor floating / sensor non-floating, monitored start-up / automatic start, 1channel / 2-channel sensor connection, cross-circuit detection, startup testing, antivalent sensors, 2-hand switches, time delay suitability for operation device connector 3ZY12 Yes suitability for interaction press control Yes suitability for use ● safety switch Yes ● monitoring of floating sensors Yes ● monitoring of non-floating sensors Yes ● magnetically operated switch monitoring Yes ● safety-related circuits Yes Certificates/ approvals General Product Approval Confirmation General Product Approval EMV Functional Saftey Type Examination Certificate Marine / Shipping other Test Certificates Marine / Shipping Type Test Certificates/Test Report Railway Confirmation Confirmation Environment Environmental Confirmations 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=3SK1121-2CB42 Cax online generator http://support.automation.siemens.com/WW/CAXorder/default.aspx?lang=en&mlfb=3SK1121-2CB42 Service&Support (Manuals, Certificates, Characteristics, FAQs,...) https://support.industry.siemens.com/cs/ww/en/ps/3SK1121-2CB42 Image database (product images, 2D dimension drawings, 3D models, device circuit diagrams, EPLAN macros, ...) 3SK11212CB42 Page 3/5 4/5/2024 Subject to change without notice © Copyright Siemens 13 23 37 47 14 24 38 48 INS INF T2 IN2 PAR T1 IN1 INK A1+ http://www.automation.siemens.com/bilddb/cax_de.aspx?mlfb=3SK1121-2CB42&lang=en -K 1 | Autostart / Monitored Start Logic SYS 2 | Cross fault detection OFF / ON 3 | 2 single-ch. sensors / 1 double-ch. sensor 4 | Startup Test yes / no A2- SET / RESET 3SK11212CB42 Page 4/5 4/5/2024 Subject to change without notice © Copyright Siemens 13 23 37 47 14 24 38 48 INS INF T2 IN2 PAR T1 IN1 INK A1+ -K 1 | Autostart / Monitored Start Logic SYS 2 | Cross fault detection OFF / ON 3 | 2 single-ch. sensors / 1 double-ch. sensor 4 | Startup Test yes / no A2- SET / RESET last modified: 3SK11212CB42 Page 5/5 3/11/2024 4/5/2024 Subject to change without notice © Copyright Siemens