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Got hold of Sime for a Carrier card for a chiller. Machine down in a factory. Received the new card in express time machine and plant now up and running fantastic service form Sime
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3SK1121-1AB40
Siemens 3SK1121-1AB40 available at EU Automation. Get in touch today for a quick price.
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What happens next?
1. Email confirmation
You will get an email confirming that we have received your enquiry.
2. Dedicated Account Manager
One of our team will be in touch to confirm your part(s) specification and condition.
3. Your quote
You will receive a comprehensive quote tailored to your specific needs.
The Siemens 3SK1121-1AB40 is a safety relay designed for use in industrial automation systems, providing reliable and efficient safety functions. This versatile relay is suitable for a wide range of applications, including safety switch monitoring, floating and non-floating sensor monitoring, magnetically operated switch monitoring, and safety-related circuits. With a compact design, the 3SK1121-1AB40 can be easily installed in any mounting position and features screw and snap-on mounting options. The relay offers a single-channel or two-channel sensor input and supports various product functions such as cross-circuit detection, startup testing, and two-hand switches. The 3SK1121-1AB40 is compliant with Safety Integrity Level (SIL) 3 and Performance Level (PL) e standards, ensuring the highest level of safety and reliability for your automation system.
| Specification | Description |
|---|---|
| Part Number | 3SK1121-1AB40 |
| Alternative Part Number | 3SK11211AB40 |
| Manufacturer | Siemens |
| Category | General Automation |
| Installation Environment (EMC) | Suitable for Class A environments only |
| Overvoltage Category | 3 |
| Degree of Pollution | 3 |
| Reference Code (DIN EN 81346-2) | F |
| Power Loss (max) | 2 W |
| Number of Sensor Inputs (1-channel or 2-channel) | 1 |
| Cascading Design | Yes |
| Safety-related Wiring of Inputs | Single-channel and two-channel |
| Cross-circuit-proof | Yes |
| Safety Integrity Level (SIL) | 3 (according to IEC 61508) |
| Performance Level (PL) | e (according to EN ISO 13849-1) |
| Category (EN ISO 13849-1) | 4 |
| Safe Failure Fraction (SFF) | 99% |
| PFHD (EN 62061) | 0.0000000025 1/h |
| PFDavg (IEC 61508) | 0.000007 |
| T1 Value (IEC 61508) | 20 years |
| Hardware Fault Tolerance (IEC 61508) | 1 |
| Safety Device Type (IEC 61508-2) | Type B |
| Number of Outputs (contact-affected switching) | 1 NC contact (signaling), 3 NO contacts (safety) |
| Stop Category (DIN EN 60204-1) | 0 |
| Input Design (cascading, feedback, start) | Yes |
| Electrical Connection | Plug-in socket not included |
| Operating Frequency (max) | 360 1/h |
| Switching Capacity Current (NO contacts, DC-13) | 3 A |
What is the protection class of the enclosure for this safety relay?
The protection class of the enclosure for the Siemens 3SK1121-1AB40 safety relay is IP20.
What is the operating temperature range for this safety relay?
The Siemens 3SK1121-1AB40 safety relay can operate in a temperature range of -25°C to +60°C.
What is the maximum installation altitude for this safety relay?
The maximum installation altitude for the Siemens 3SK1121-1AB40 safety relay is 2,000 meters above sea level.
What is the Safety Integrity Level (SIL) of this safety relay?
The Safety Integrity Level (SIL) of the Siemens 3SK1121-1AB40 safety relay is SIL 3 according to IEC 61508.
What is the Performance Level (PL) of this safety relay?
The Performance Level (PL) of the Siemens 3SK1121-1AB40 safety relay is PL e according to EN ISO 13849-1.
How many sensor inputs does this safety relay support?
The Siemens 3SK1121-1AB40 safety relay supports 1 sensor input, which can be wired in single-channel or two-channel configurations.
What is the maximum operating frequency of this safety relay?
The maximum operating frequency of the Siemens 3SK1121-1AB40 safety relay is 360 operations per hour.
How many safety-related NO contacts does this safety relay have?
The Siemens 3SK1121-1AB40 safety relay has 3 safety-related NO (normally open) contacts.
Does this safety relay support cascading?
Yes, the Siemens 3SK1121-1AB40 safety relay supports cascading for extended safety functions.
- Industrial safety systems
- Emergency stop circuits
- Machine guarding applications
- Safety door monitoring
- Light curtain integration
- Two-hand control systems
- Conveyor safety systems
- Robotic work cell safety
- Safety interlock systems
- Safety mat monitoring
This content has been produced using multiple sources. EU Automation takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
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Customer reviews
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Daniel
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Alex Bailey is my main point of contact at EU Automation...he is extremely friendly, has exceptional customer service skills and always offers great pricing & lead times.
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Tom Higgins did a great job at getting us the part we needed. He saw a concern with the part a verified before shipping.
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