3SK1121-1CB42
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- Manufacturer: Siemens
- Series: SIRIUS 3SK1
- Model: 3SK1121-1CB42
- Item Number: 3SK1121-1CB42
- Device Type: Safety Switch / Safety Relay
- Implementation: Advanced Base Unit with Time Delay
- Supply voltage: 24 V DC
- Operating Voltage Range: 0.8–1.2 × rated voltage
- Typical power dissipation: 2,5 W
- Non-delayed safety outputs: 2 × Normally Open Relays
- Delayed safety outputs: 2 × Normally Open Relays
- Adjustable time delay: 0.5–30 s
- Stop category: 0 / 1 in accordance with DIN EN 60204-1
- Sensor input: 1- or 2-channel
- Cascade input: Available
- Feedback input: Available
- Start page: Available
- Cross-short circuit detection: Available / Configurable
- Start function: Supervised startup or autostart
- Security Integrity Level: SIL 3 in accordance with IEC 61508
- SIL time-delayed enable circuit: SIL 3
- Performance Level: PL e in accordance with EN ISO 13849-1
- Performance Level of a time-delayed enable circuit: PL e
- Security category: Category 4 according to EN ISO 13849-1
- SFF: 99 %
- PFHd: 3.7 × 10⁻⁹ 1/h
- PFDavg: 7 × 10⁻⁶
- Service life / Proof test interval T1: 20 years
- Safety device type: Type B according to IEC 61508-2 0900766b817035aa
- Maximum switching frequency: 360 cycles/hour
- Rated current DC-13 at 24 V: 3 A
- Rated current DC-13 at 115 V: 0,2 A
- Rated current DC-13 at 230 V: 0,1 A
- Rated current AC-15 at 115 V: 3 A
- Rated current AC-15 at 230 V: 3 A
- Maximum thermal current of the relay contacts: 5 A
- Minimum operating current for 17 V: 5 mA
- Mechanical service life: Typically 10,000,000 switching cycles
- Maximum cable length per sensor circuit: 4,000 m at Cu 1,5 mm² and 150 nF/km
- Startup time on autostart: Max. 110 ms
- Start-up time for monitored start: Max. 110 ms
- Typical fallback delay after the safety circuit is opened: 40 ms 0900766b817035aa
- Rated insulation voltage: 300 V
- Rated surge voltage withstand capability: 4.000 V
- Enclosure Protection Rating: IP20
- Protection against accidental contact: Fingersicher
- Electrical connection: Screw connection
- Mounting: Screw and snap-fit fasteners
- Installation orientation: Any
- Width: 22,5 mm
- Height: 100 mm
- Depth: 121,6 mm
- New (OVP): Unused and undamaged items in the original packaging.
- New (without original packaging): Unused and undamaged items that may no longer be in the original packaging.
- Like New: Items that look like new and show only minimal signs of wear.
- Very good: Items that show only slight signs of wear and are fully functional.
- Good: Items that show normal signs of use but are still fully functional.
- Acceptable: Items that show more severe signs of wear but are functional.
- Defective / DIY: Items that are no longer functional or have significant damage. These items are usually sold for spare parts or for repair.
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Orders received by 2:00 p.m. will be dispatched on the same working day. However, this does not apply to purchases over €1,000 outside Europe, as an export note is required for this, or for shipments sent by a freight forwarder. For particularly urgent deliveries, you can choose express shipping.
For each of our products you can select the condition, with the following categories available:
New (OVP): Unused and undamaged items in the original packaging.
New (without original packaging): Unused and undamaged items that may no longer be in the original packaging.
Like New: Items that look like new and show only minimal signs of wear. Very Good: Items that show only light signs of wear and are fully functional. Good: Items that show normal signs of wear but are still fully functional.
Acceptable: Items that show more severe signs of wear but are functional.
Defective / DIY: Items that are no longer functional or have significant damage. These items are usually sold for spare parts or for repair. If there are major differences between the condition categories, e.g. broken casing, a separate image is added for the affected category. Otherwise, grades such as "Very Good" and "Good" can only be distinguished from one another by increasing signs of wear.
The E-Stand on Siemens industrial electronics products provides information about the development and modifications of a specific product. It is a classification system that Siemens uses to identify different production and development stages within a product type. Each E-Stand can include technical improvements, adjustments or other changes.
An important point to note is that products with different E-levels are not always directly interchangeable. Technical characteristics may differ between versions, which means that compatibility with your existing plant or system may not always be guaranteed. It is advisable to carefully check whether the new product is compatible with the corresponding E-level for your application before making a replacement.
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