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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3SK1121-1CB41 |
| Alternative Part Number | 3SK11211CB41 |
| Manufacturer | Siemens |
| Product Series | SIRIUS |
| Product Type | Safety Relay |
| Supply Voltage | 24 V dc |
| Output Configuration | 2NO |
| Terminal Type | Screw Terminal |
| Dimensions | 22.5 x 121.6 x 100 mm |
| Mounting Type | Screw and snap-on mounting |
| Insulation Voltage | Rated at 300 V |
| Ambient Operating Temperature Range | -25 to +60 °C |
| Installation Altitude | Up to 2000 m above sea level |
| Vibration Resistance | According to IEC 60068-2-6, 5 to 500 Hz: 0.75 mm |
| Shock Resistance | 10g / 11 ms |
| Surge Voltage Resistance | Rated value 4,000 V |
| EMC | Suitable for Class A environments, can cause interference in residential environments |
| Safety Integrity Level (SIL) | According to IEC 61508, SIL3 |
| Performance Level (PL) | According to EN ISO 13849-1, e |
| Category | According to EN ISO 13849-1, 4 |
| Safe Failure Fraction (SFF) | 99% |
| PFHD | With high demand rate according to EN 62061, 0.0000000037 1/h |
| PFDavg | With low demand rate according to IEC 61508, 0.000007 |
| T1 Value | For proof test interval or service life according to IEC 61508, 20 years |
| Hardware Fault Tolerance | According to IEC 61508, 1 |
| Safety Device Type | According to IEC 61508-2, Type B |
| Number of Sensor Inputs | 1-channel or 2-channel |
| Cross-Circuit Detection | Yes |
| Monitored Start | Yes |
| Time Delay | Parameterizable |
| Suitable for Operation | Device connector 3ZY12 |
| Suitable for Interaction | Press control |
| Suitable for Use | Safety switches, monitoring of floating/non-floating sensors, magnetically operated switches |
The Siemens SIRIUS Series Safety Relay is a vital component for industrial automation, designed to ensure the highest standards of safety in machinery and plant operations. This advanced safety relay, with the part number 3SK1121-1CB41, operates with a 24 V dc control supply voltage and features a compact design with dimensions of 22.5 x 121.6 x 100 mm, making it suitable for integration into various control panels and systems.
Equipped with two normally open (NO) contacts for immediate response and two NO contacts for delayed operations, this relay provides flexibility in safety circuit design, allowing for both instantaneous and time-delayed safety functions. The screw terminal connection ensures a secure and reliable installation, while the relay's ability to handle single-channel or dual-channel sensor inputs makes it adaptable to a range of safety applications.
With a solid construction that meets the IP20 protection class, the relay is finger-safe and designed to withstand the rigours of industrial environments. Its compliance with relevant international safety standards, including a Safety Integrity Level (SIL) of 3 and a Performance Level (PL) of e, ensures that it can be trusted to perform safety functions to the highest levels required for protecting both machinery and personnel.
The SIRIUS safety relay is an essential component for those who require a dependable and versatile safety solution in their automated processes, providing peace of mind through enhanced safety measures and operational reliability.
Commonly Asked Questions
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Frequently Asked Questions
What is the voltage rating for this safety relay?
The Siemens SIRIUS Series Safety Relay is rated for 24 V dc.
How many normally open contacts does the relay have?
This safety relay is equipped with 2 normally open (NO) contacts.
What type of terminal does this relay use for wire connections?
The relay utilises screw terminals for secure wire connections.
Can you specify the dimensions of this safety relay?
The dimensions of the safety relay are 22.5 x 121.6 x 100 mm.
What applications is this safety relay commonly used for?
It is commonly used in machine safety applications, providing essential safety functions such as emergency stop, safety door monitoring, and light curtain integration.
Is this relay suitable for use in a safety circuit?
Yes, the Siemens SIRIUS Series Safety Relay is designed to be used in safety circuits and can help in achieving required safety levels for machinery.
What should I consider when installing this relay?
When installing the relay, ensure it is protected against electrically conductive contamination and installed in an environment that meets its protection requirements.
How can I ensure the safety relay functions properly in my system?
To ensure proper functionality, the relay should be integrated as part of a complete safety system, including sensors, evaluation units, and signalling units, following the manufacturer's guidelines.
What is the significance of the Commodity Code for this relay?
The Commodity Code, which is 853649 for this relay, is used for international trade and customs declarations to classify the product.
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