Image shown may not reflect the final product

Siemens 3SK1121-2AB40

Name: 3SK1121-2AB40
Brand: Siemens
SKU: 3SK1121-2AB40
Price: 110.55 GBP
Availability: InStock

Wrong part? Click here

£110.55 (ex. VAT)

2 ready to ship

Learn more about our conditions.

Image shown may not reflect the final product

Marvo Stock ID MV-73E5

HS Code 85364900

SKU 3SK1121-2AB40

Condition Used

Category Soft Starts

Warranty 12 months

Weight (kg) 1.00

Length (mm) 210.00

Width (mm) 160.00

Height (mm) 60.00

Express delivery

Lightning fast delivery if ordered within 00:00:00

Need it urgently?

Call: +44 20 4570 3439

Quoting Marvo Stock ID: MV-73E5

Select condition

We're working hard to deliver your orders on time over the holiday period, but please be aware that some lead times may be extended.

Learn more about our conditions.

Returns Hassle-free returns

Thumbs up No hidden fees or duties

Shipping Swift dispatch and delivery

Similar Products

3RW4024-1TB05

£444.20 (ex. VAT)

6GK5496-4MA00-8AA2

£208.46 (ex. VAT)

3RW4026-1BB04

£372.57 (ex. VAT)

3RW4036-1BB04

£410.22 (ex. VAT)

More about this product

Specification & Description

View now

Commonly Asked Questions

View now

Customer Reviews

View now

Specification & Description

Specification	Description
Part Number	3SK1121-2AB40
Alternative Part Number	3SK11212AB40
Manufacturer	Siemens
Category	Soft Starts
Series	3SK1
Type	Safety Relay
Supply Voltage	24 V dc
Channels	1 Channel
Contacts Configuration	1NC/3NO
Number of Contacts	2 Contacts
Dimensions	22.5 x 100 x 121.6 mm
Mounting Type	Screw and snap-on mounting
Connection Type	Spring-loaded terminal (push-in)
Safety Integrity Level (SIL)	SIL3
Performance Level (PL)	e
Category according to EN ISO	13849-1 Category 4
Safe Failure Fraction (SFF)	99%
PFHD	0.0000000025 1/h
PFDavg	0.000007
T1 Value for Proof Test Interval	20 years
Hardware Fault Tolerance	1
Safety Device Type	Type B
EMC	Suitable for Class A environments only
Overvoltage Category	3
Degree of Pollution	3
Ambient Operating Temperature	-25 to +60 °C
Protection Class	IP20
Insulation Voltage	Rated value 300 V
Power Loss	Maximum 2 W

The Siemens 3SK1121-2AB40 is a state-of-the-art safety relay from the 3SK1 series, designed to ensure the highest standards of safety in industrial environments. This compact device, measuring 22.5 x 100 x 121.6 mm, is engineered to seamlessly integrate into a variety of control systems, providing reliable protection and monitoring for machinery and personnel.

Equipped with a 24 V dc control supply voltage, the relay is suitable for Class A environments, adept at managing undesired radio-frequency interference in such settings with appropriate measures. It features a single-channel input that can be wired in either a single or dual-channel configuration, enhancing its versatility and application scope.

The safety relay boasts an impressive safety integrity level (SIL) of 3 according to IEC 61508 and a performance level (PL) of e according to EN ISO 13849-1, categorised at level 4. With a safe failure fraction (SFF) of 99%, it ensures a high degree of reliability and safety. The hardware fault tolerance is rated at 1, and the device is classified as a Type B safety device according to IEC 61508-2.

For signalling functions, the relay includes 1 normally closed (NC) contact and 3 normally open (NO) safety-related contacts, ensuring immediate and reliable response to safety conditions. The product is also designed with cross-circuit detection and monitored start-up features, adding an extra layer of safety during operation.

The Siemens 3SK1121-2AB40 is designed for easy installation with its screw and snap-on mounting options, and it supports a wide range of conductor cross-sections for flexible connection requirements. Its push-in terminal connection type simplifies the wiring process, making it user-friendly and time-efficient for setup.

This safety relay is an essential component for applications requiring stringent safety measures, such as emergency stop functions, safety door monitoring, and light curtain integration. Its robust design and advanced safety features make it a reliable choice for safeguarding complex industrial 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.

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.

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.

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.

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.

Peace of mind with every purchase

Dan

‘The ordering was fast and efficient, and everything arrived just as they said it would.’

Julien

‘Perfect quick delivery, good service.’

Thomas Roland Geaughan

‘Prompt and expert service. Ease of access to find the parts I needed.’

Martin Juřica

‘Fast offer, short delivery time.’

Milan Kosík

‘Large selection of spare parts, fast delivery.’

Ms. Mia

‘Quick response, good item, delivery on schedule.’

Dan

‘The ordering was fast and efficient, and everything arrived just as they said it would.’

Thomas Roland Geaughan

‘Prompt and expert service. Ease of access to find the parts I needed.’

Andreas Boehm

‘Excellent service. The right gear and the right price,well packed and delivered on time.’

Ms. Mia

‘Quick response, good item, delivery on schedule.’

Julien

‘Perfect quick delivery, good service.’

Martin Juřica

‘Fast offer, short delivery time.’

Kayden

‘Services is great.’

Learn more about Marvo

Our service to you

Lightning-Fast Express Shipping: Receive your order in record time with our express shipping options, ensuring you minimize downtime and keep your projects on track.

No-Risk Returns, Guaranteed: Return your parts anytime for a full refund. Our hassle-free return policy ensures you’re never stuck with something you don’t need.

Clear Pricing with No Hidden Fees: What you see is what you pay, transparent pricing with no extra costs, ever. Rest assured, all taxes and fees are already included in your final price.

Rock-Solid Reliability at a Fraction of the Cost: Get pre-owned electronic parts that are fully tested for peak performance, saving you money without compromising on quality, backed by a comprehensive warranty.

Frequently Asked Questions

What type of safety relay is this?

This is a SIRIUS safety relay from the Advanced series, designed for enabling circuits and signalling functions in safety applications.

Can this safety relay be used with both single-channel and two-channel sensor connections?

Yes, the safety relay supports both single-channel and two-channel sensor connections, offering flexibility for various safety circuit configurations.

What is the supply voltage required for this safety relay?

The safety relay requires a supply voltage of 24 V DC to operate effectively.

What are the dimensions of this safety relay?

The dimensions of the safety relay are 22.5 mm in width, 100 mm in height, and 121.6 mm in depth.

What type of terminal connection does this safety relay have?

This safety relay features a spring-type terminal, also known as a push-in terminal, for quick and secure connections.

Is this safety relay suitable for use with safety switches?

Yes, it is suitable for use with safety switches, and it can also monitor floating and non-floating sensors as well as magnetically operated switches.

What is the insulation voltage rating for this safety relay?

The insulation voltage rated value for this safety relay is 300 V.

What is the maximum operating frequency of this safety relay?

The maximum operating frequency of the safety relay is 360 operations per hour.

What is the ambient temperature range for the operation of this safety relay?

The safety relay can operate within an ambient temperature range of -25 °C to +60 °C.

What certifications does this safety relay have?

The safety relay has general product approvals for EMC and conforms to Functional Safety/Safety of Machinery standards.

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.

The Smart Part

Factories implementing AI-driven systems, highlighting the benefits of investing in artificial intelligence.## Should You Be Investing in Artificial Intelligence?

Should you be investing in artificial intelligence?

Marvo

Just a few years back, investing in AI only existed in the realm of science fiction. It was a futuristic technology that could be found solely in books or in Hollywood films. Fast forward to todays world and AI is rapidly becoming an integral part of our daily lives. It is reshaping how we work, communicate and solve complex problems.

4 min read

December 13, 2024

The top 10 ways to improve your supply chain strategy

10 advanced techniques to improve your supply chain strategy

Marvo

A robust supply chain strategy is crucial in today’s interconnected and rapidly evolving global economy. Problems that businesses face include shifting consumer preferences, interruptions in supply, and an increasing focus on sustainability. This article delves into ten cutting-edge methods, in order to keep supply chain tactics robust, efficient, and competitive.

7 min read

November 22, 2024

What is supply chain optimisation?

Marvo

Supply chain optimisation is the key to navigating today's rapidly evolving manufacturing landscape. By improving their operations and logistics, businesses can reach greater levels of efficiency. This refinement also leads to strategic agility. As a result, companies position themselves to adapt to new challenges and seize opportunities.

6 min read

November 1, 2024

See all articles