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Siemens 3SK1121-1AB40

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3SK1121-1AB40
3SK1121-1AB40
3SK1121-1AB40

Image shown may not reflect the final product

Marvo Stock ID MV-78AG
HS Code 85371098
SKU 3SK1121-1AB40
Condition Used
Category General Automation
Warranty 12 months
Weight (kg) 2.00
Length (mm) 320.00
Width (mm) 250.00
Height (mm) 250.00
EAN 4011209913585

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Specification & Description

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Specification & Description

Specification Description
Part Number 3SK1121-1AB40
Alternative Part Number 3SK11211AB40
Manufacturer Siemens
Category General Automation
Product Type Safety Relay
Supply Voltage 24 V DC
Terminal Type Screw Terminal
Protection Class IP IP20
Insulation Voltage Rated Value 300 V
Ambient Temperature (Operation) -25 ... +60 °C
Ambient Temperature (Storage) -40 ... +80 °C
Air Pressure 90 kPa ... 106 kPa
Relative Humidity During Operation 10 ... 95 %
Installation Altitude Up to 2,000 m above sea level
Vibration Resistance 5 ... 500 Hz: 0.75 mm
Shock Resistance 10g / 11 ms
Surge Voltage Resistance Rated value 4,000 V
EMC Suitable for Class A environments only
Safety Integrity Level (SIL) SIL3 according to IEC 61508
Performance Level (PL) PL e according to EN ISO 13849-1
Category Category 4 according to EN ISO 13849-1
Safe Failure Fraction (SFF) 99 %
PFHD 0.0000000025 1/h
PFDavg 0.000007
T1 Value for Proof Test Interval 20 years
Hardware Fault Tolerance According to IEC 61508: 1
Safety Device Type Type B according to IEC 61508-2
Number of Safety-Related Outputs 3 NO contacts for safety-related instantaneous contact
Number of Signalling Outputs 1 NC contact for signalling function
Weight 0.280 kg
Commodity Code 85364900

The Siemens Safety Relay, with the part number 3SK1121-1AB40, is a sophisticated and reliable component designed for seamless integration into various industrial safety systems. This advanced relay is part of the SIRIUS product range, renowned for its high-quality automation solutions.

Crafted to ensure the utmost safety, the 3SK1121-1AB40 operates with a 24 V DC control supply voltage and features a robust screw terminal connection for secure and stable wiring. The relay is equipped with three normally open (NO) contacts for enabling circuits, plus one normally closed (NC) contact for signalling purposes, providing flexibility and adaptability to a wide array of safety applications.

With an insulation voltage rated at 300 V and a protection class of IP20, this safety relay is designed to be finger-safe, preventing accidental electrical shocks. It is capable of withstanding a wide range of ambient temperatures from -25 to +60 °C during operation, ensuring reliability in diverse working environments.

The 3SK1121-1AB40 is specifically engineered for Class A environments, adhering to stringent EMC requirements to minimise radio-frequency interference in residential areas. It boasts an impressive mechanical service life with typical switching cycles up to 10 million, highlighting its durability and longevity.

This safety relay is also parameterisable, offering features such as sensor floating/non-floating, monitored start/autostart, and cross-circuit detection. It supports both single-channel and two-channel sensor connections, enhancing its versatility in monitoring safety switches, floating sensors, non-floating sensors, and magnetically operated switch monitoring.

The 3SK1121-1AB40 is a testament to Siemens' commitment to functional safety, with certifications that include Safety Integrity Level (SIL) 3 according to IEC 61508, Performance Level (PL) e according to EN ISO 13849-1, and Category 4 according to EN ISO 13849-1. These credentials ensure that the relay meets the highest standards of safety and reliability for machinery and safety-related circuits.

In summary, the Siemens 3SK1121-1AB40 Safety Relay is an essential component for any industrial safety system, offering advanced features, robust construction, and compliance with international safety standards. It is an ideal choice for those seeking a dependable solution to manage and enhance the safety of their automated processes.

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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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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Frequently Asked Questions

What is the purpose of this safety relay?

The Siemens Safety Relay is designed for monitoring and controlling safety functions within an automation environment. It ensures that machines and processes operate safely by initiating the necessary responses when a safety event occurs.

Can this safety relay be used for emergency stop applications?

Yes, it is suitable for use in emergency stop applications, as well as safety gate monitoring and light curtain integration, among other safety functions.

What type of power supply is required for this safety relay?

This safety relay requires a 24 V DC power supply for operation.

What are the environmental operating conditions for this safety relay?

The relay operates within an ambient temperature range of -25 to +60 degrees Celsius and can be stored in temperatures ranging from -40 to +80 degrees Celsius. It is also designed to withstand certain levels of vibration and shock.

What is the significance of the SIL rating for this relay?

The Safety Integrity Level (SIL) rating indicates the reliability of the safety functions performed by the relay. This relay has a SIL3 rating, which means it is suitable for high-risk applications where a high level of safety integrity is required.

How does this safety relay contribute to a machine's Performance Level?

The relay is rated to Performance Level e (PL e) according to EN ISO 13849-1, which is the highest level of performance for controlling safety-related parts of a control system.

What type of terminals does this safety relay have?

It comes equipped with screw terminals, which provide a secure and reliable connection for wiring.

Is this safety relay suitable for use in residential areas?

This product is intended for Class A environments, which are typically industrial settings. It may cause radio-frequency interference in residential environments, so appropriate measures should be taken if used in such areas.

What is the maximum installation altitude for this safety relay?

The maximum installation altitude for this relay is 2000 meters above sea level.

Can this safety relay be used in a safety system with both single-channel and dual-channel wiring?

Yes, it supports both single-channel and two-channel safety-related wiring, allowing for flexibility in safety system design.

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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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