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Siemens 3SK1121-1CB41

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3SK1121-1CB41
3SK1121-1CB41
3SK1121-1CB41

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Marvo Stock ID MV-BC7U
HS Code 85371098
SKU 3SK1121-1CB41
Condition Used
Warranty 12 months
Weight (kg) 1.00
Length (mm) 320.00
Width (mm) 250.00
Height (mm) 250.00
EAN 4011209913592

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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

Is my order covered by a warranty?

Marvo provides a full 12-month warranty on all products, whatever the condition. For your peace of mind, all parts are ‘Marvo Approved’ which means that they have been tested and checked to ensure that they are in working condition. If you are unhappy with the part(s) you received and would like to request a return, you can do so by completing our quick and easy online form. Once we have received your Returns Request, a member of the team will be in touch to discuss this further with you. You can read more about our warranty policy here.

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What payment methods do you accept?

We accept card payments from all major credit, debit and Mastercard providers including Visa, American Express, Western Union, Paypal and bank transfers. Before you complete an order you will be prompted to input your payment details, at which point you can enter the relevant card information you wish to use for your transaction. If you are experiencing issues with your payment method then you can contact our team via email here. From there, you will be directed to the most relevant resource or person to help you complete your payment, get your order processed and ensure that your parts are on the way to your delivery address.

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Is Marvo a credible parts supplier?

Marvo is a highly credible supplier of industrial automation parts and components with dedicated hubs around the world offering industry-leading products and services. Marvo is committed to providing a quick, easy and reliable place to source your automation and control components. All purchases come as standard with a comprehensive 12-month return to base warranty meaning that, in just a few clicks, you can source critical parts more seamlessly than ever before. Click here to read an article on how Marvo is redefining convenience for automation and manufacturing professionals.

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Have steps been taken to ensure quality control?

Marvo takes pride in product quality and has put several measures in place to assure high levels of quality standards. For your peace of mind, all parts have been ‘Marvo Approved’ which means that they have been tested and checked to ensure that they are in working condition. Redefine convenience and secure priority delivery on all parts along with a comprehensive 12-month warranty. This is the smart new way to buy automation and control components.

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How do I create an account?

Creating an account is incredibly simple and takes a matter of seconds. You can create a Marvo account at any time by clicking here and following the simple steps on screen. By creating a Marvo account you can store your contact details, delivery addresses, billing addresses and more, meaning that you can enjoy game-changing convenience faster than ever before.

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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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Part conditions explained

We want your buying experience to be as seamless as possible. So, here are all of the product descriptions you will see when browsing Marvo, explained a little further:

New unsealed: The product is in its original packaging, but the packaging has been opened or unsealed. It has never been used and should be in near pristine condition.

New sealed: The product is sealed in its original packaging. It has never been opened or used, ensuring that it's in an untouched state.

New unboxed: The product does not come in its original packaging, but it has never been used and is in great working condition.

Refurbished: The product has been previously used, but it has undergone a thorough refurbishment process to restore it to a like-new or functional condition. Any defects or issues have been addressed, making it suitable for reuse.

Used: The product has been previously owned and has been used. It may show signs of wear and tear but is still functional and operational. The condition may vary depending on the specific item and its usage history.

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