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-27WO

£67.54 (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 Thomas Roland Geaughan

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

Express delivery guaranteed

If ordered within 00:00:00


Specification Description
Part Number 3RV2021-1BA10
Alternative Part Number 3RV20211BA10
Manufacturer Siemens
Type Circuit Breaker
Poles 3 Pole
Current Rating 2 A
Voltage Rating 690 V ac
Dimensions 45 x 96.9 x 97 mm
Mounting Type Screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715
Short-Circuit Protection Yes, with magnetic trip design
Terminal Type Screw-type terminals for main current circuit
Conductor Cross-Section 2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²) for main contacts
Tightening Torque 2 ... 2.5 N·m for main contacts with screw-type terminals
Protection Class IP20 on the front according to IEC 60529
Tripping Characteristics Available for review in product documentation
Compliance General Product Approval for use in hazardous locations

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.

3RV2021-1BA10 Product Description

The Siemens 3RV2021-1BA10 is a robust circuit breaker designed for industrial applications requiring reliable protection and control. This three-pole device is engineered to handle a rated operating voltage of up to 690 V ac, ensuring compatibility with a wide range of electrical systems. With an adjustable pick-up value current of the current-dependent overload release ranging from 1.4 to 2 A, it offers precise protection for electrical circuits against overload conditions.

The compact dimensions of 45 x 96.9 x 97 mm make it suitable for space-constrained environments, while the screw and snap-on mounting options provide flexibility for installation on standard 35 mm mounting rails according to DIN EN 60715. The circuit breaker's design includes a short-circuit protection feature with a magnetic trip, enhancing the safety of the electrical system it is integrated into.

The construction of the Siemens 3RV2021-1BA10 ensures ease of use and maintenance, with a clear indication of the switching status via its handle display. It is designed to withstand challenging industrial conditions, with a mechanical service life of 100,000 switching cycles for both main and auxiliary contacts, and an electrical endurance of the same, ensuring long-term reliability and performance.

This circuit breaker is a vital component for industrial control panels, motor control centres, and various other applications where circuit protection is paramount. Its design adheres to international standards, providing increased safety and a finger-safe terminal to prevent electrical shock, making it a trusted choice for electrical protection in the UK and beyond.

Frequently Asked Questions

What type of circuit breaker is this?

This is a 3-pole circuit breaker designed for protecting electrical circuits from overloads and short circuits.

Can this circuit breaker be used in hazardous locations?

Yes, it has been approved for use in hazardous locations, ensuring safe operation under such conditions.

What is the current rating for this circuit breaker?

The current rating for this circuit breaker is adjustable between 1.4 to 2 A.

What is the maximum operating voltage for this device?

The maximum operating voltage for this circuit breaker is 690 V ac.

What are the dimensions of this circuit breaker?

The dimensions are 45 x 96.9 x 97 mm, making it compact and suitable for standard mounting rails.

Is there a specific mounting position required for this circuit breaker?

No, it can be mounted in any position, providing flexibility in installation.

What type of terminals does this circuit breaker have?

It features screw-type terminals for the main current circuit.

What is the mechanical service life of this circuit breaker?

The mechanical service life is typically 100,000 switching cycles for both the main and auxiliary contacts.

Does this circuit breaker offer short circuit protection?

Yes, it includes a magnetic short-circuit trip feature for reliable protection.

What is the protection class of the terminals?

The terminals are rated at IP20, providing a degree of protection against solid objects.