You are on Marvo for
United Kingdom (£)
It looks like you're in United States.
Your purchases will be limited to delivery within United Kingdom. If you wish to ship parts to either United States or Germany please navigate to the relevant site using the options below.


Marvo Part ID: MV-27WT

£45.20 (ex. VAT)


Trustpilot Stars Qty

Accepted payment methods:

Stripe logo
Paypal logo
Visa logo
Mastercard logo
American Express logo
Bank Transfer logo


You can return your part(s) and request a full refund at any time. Refer to our returns policy for more information.

Stars Anna

‘I can recommend quick, efficient, and professional.’

Stars Julien

‘Perfect quick delivery, good service.’

Express delivery guaranteed

If ordered within 00:00:00

Commonly Asked Questions

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 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 countries can Marvo deliver to?

Marvo currently delivers to the United Kingdom (excluding Northern Ireland), the United States of America and Germany. If you cannot find your delivery address at checkout, this is most likely because Marvo does not currently deliver to this location. There are ongoing efforts to make Marvo accessible to a global market, keep your eyes peeled as our service expands to new locations. All orders are sold with a streamlined delivery process ensuring that you get your part, fast. Marvo is designed to offer you quick, easy and reliable access to critical components and uses well established global shipping services, including but not limited to DHL, UPS and FedEx.


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.


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.


Peace of mind with every purchase


Marvo Approved

A seal of quality that ensures each part is fully inspected, every time. Purchase with confidence thanks to Marvo Approved.


Full warranty

All parts are covered by a comprehensive warranty. If something goes wrong, I’ll put it right.


Priority delivery

Advanced tracking and a streamlined delivery process ensure that you get your part, fast.


Committed to you

Engineered to ensure that you always have a quick, easy and reliable place to source automation and control components.

3RV2021-4BA10 Product Description

The Siemens 3RV2021-4BA10 is a robust and reliable circuit breaker designed to offer effective protection for electrical circuits. This three-pole breaker is rated for 20 A at 400 V ac to 690 V ac, with an impressive interrupting capacity of 100 kA, ensuring it can handle significant fault currents without compromise. Its compact dimensions of 97 x 45 x 96 mm make it suitable for space-constrained applications, while the thermal-magnetic trip feature provides both thermal overload and instantaneous short-circuit protection.

Engineered for durability and longevity, the 3RV2021-4BA10 is equipped with screw-type terminals for secure and straightforward wiring. It is designed for easy mounting onto a 35 mm standard mounting rail according to DIN EN 60715, allowing for quick installation and maintenance. The circuit breaker's handle offers a clear indication of the switching status, adding to the convenience of use.

This circuit breaker is a versatile solution for a range of industrial applications, including motor protection and isolation. It is designed to meet the rigorous standards of industrial environments, ensuring consistent performance and protection for your electrical systems. With its precise tripping characteristics and reliable operation, the Siemens 3RV2021-4BA10 is an essential component for managing electrical safety and efficiency in various settings.

Frequently Asked Questions

What type of circuit breaker is this?

This is a thermal-magnetic circuit breaker designed for protecting electrical circuits from both overloads and short circuits.

Can this circuit breaker be used in hazardous locations?

Yes, it has approvals for use in hazardous locations, ensuring it meets the necessary safety standards for such environments.

What is the current rating of this circuit breaker?

The circuit breaker has a current rating of 20 A at 400 V ac to 690 V ac.

What are the dimensions of this circuit breaker?

The dimensions are 97 mm in height, 45 mm in width, and 96 mm in depth.

What is the interrupting capacity of this circuit breaker?

It has an interrupting capacity of 100 kA, which indicates its maximum short-circuit breaking capability.

How many poles does this circuit breaker have?

This circuit breaker is a 3-pole device, suitable for three-phase applications.

What type of terminals does this circuit breaker have?

It features screw-type terminals for the main current circuit, providing a secure and reliable connection.

Is this circuit breaker suitable for snap-on mounting?

Yes, it can be mounted by snapping onto a 35 mm standard mounting rail according to DIN EN 60715.

What is the required spacing for this circuit breaker when installed?

The required spacing for grounded parts at 690 V is 50 mm downwards and upwards, 30 mm at the side, and 0 mm backwards and forwards.

Does this circuit breaker have a removable terminal for auxiliary and control circuits?

No, this model does not have a removable terminal for auxiliary and control circuits.