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Siemens 3RH1921-1EA20

Name: 3RH1921-1EA20
Brand: Siemens
SKU: 3RH1921-1EA20
Price: 23.21 GBP
Availability: InStock

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£23.21 (ex. VAT)

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Marvo Stock ID MV-22LB

HS Code 85365080

SKU 3RH1921-1EA20

Condition New sealed

Warranty 12 months

Weight (kg) 1.00

Length (mm) 350.00

Width (mm) 250.00

Height (mm) 110.00

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Specification & Description

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Commonly Asked Questions

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Customer Reviews

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Specification & Description

Specification	Description
Part Number	3RH1921-1EA20
Alternative Part Number	3RH19211EA20
Manufacturer	Siemens
Product Type	Auxiliary Switch Block
Mounting Type	Snap On Mount
Number of Contacts	2 Normally Open (NO)
Rated Insulation Voltage	500 V
Protection Class	IP20
Ambient Operating Temperature	-25 ... +60 °C
Mechanical Service Life	Typical 10,000,000 switching cycles
Electrical Endurance	Typical 200,000 switching cycles at AC-15, 230 V
Contact Reliability	1 faulty switching per 100 million operations (17 V, 1 mA)
Surge Voltage Resistance	Rated value 6 kV
Suitability for Use	Contactor relay and power contactor
Storage Temperature Range	-55 ... +80 °C

The Siemens 3RH1921-1EA20 is a high-quality auxiliary switch block designed to enhance the functionality of contactor relays and power contactors. This component is engineered to be compatible with a range of motor contactors from sizes S0 to S12. It features two normally open (NO) contacts, which are crucial for various control and signalling functions within electrical circuits.

Crafted with precision, the 3RH1921-1EA20 boasts an IP20 protection class on the front, ensuring that it is safeguarded against solid objects larger than 12.5mm but not against water. This makes it suitable for use in environments where it is not exposed to moisture. The auxiliary switch block operates reliably within an ambient temperature range of -25 to +60 degrees Celsius, making it versatile for different working conditions.

The mechanical service life of this component is typically 10 million switching cycles, and it has an electrical endurance of 200,000 cycles at AC-15 at 230V, which speaks to its durability and longevity. The switch block is designed with a snap-on mounting type, which allows for quick and easy installation onto the contactor. It measures 10mm in width, 80mm in height, and 71mm in depth, making it a compact addition to your electrical setup.

The 3RH1921-1EA20 is equipped with screw-type terminals for secure and reliable electrical connections. It can accommodate a range of conductor cross-sections, both solid and finely stranded, with or without core end processing. This flexibility ensures that it can be integrated seamlessly into various electrical systems.

This auxiliary switch block is a testament to Siemens' commitment to quality and reliability in electrical components. It is a valuable asset for enhancing control operations within industrial and commercial electrical systems.

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.

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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 is the function of this auxiliary switch block?

The auxiliary switch block is designed to provide additional switching functions when mounted onto a contactor or relay. It offers two normally open (NO) contacts that can be used for various control and signalling functions in an electrical circuit.

Can this auxiliary switch block be used with any size of contactor?

This auxiliary switch block is suitable for use with contactors ranging from size S0 to S12, ensuring compatibility with a wide range of motor contactors.

What type of terminals does this auxiliary switch block have?

The auxiliary switch block comes with screw-type terminals, which provide a secure and reliable connection for auxiliary and control current circuits.

What is the insulation voltage rating for this auxiliary switch block?

The insulation voltage rating with a degree of pollution 3 for this auxiliary switch block is rated at 500 V.

What is the surge voltage resistance of this auxiliary switch block?

The surge voltage resistance of this auxiliary switch block is rated at 6 kV.

What is the mechanical service life of this auxiliary switch block?

The mechanical service life of this auxiliary switch block is typically 10 million switching cycles, indicating its durability and longevity.

What is the electrical endurance of this auxiliary switch block at AC-15, 230 V?

At AC-15, 230 V, the electrical endurance of this auxiliary switch block is typically 200,000 switching cycles.

What are the ambient temperature limits for operating this auxiliary switch block?

The auxiliary switch block can operate within an ambient temperature range of -25 to +60 °C, and can be stored in temperatures ranging from -55 to +80 °C.

How is this auxiliary switch block mounted?

This auxiliary switch block is designed for snap-on mounting, which allows for quick and easy installation onto the side of a contactor or relay.

Does this auxiliary switch block have a mirror contact function?

Yes, this auxiliary switch block has a mirror contact function according to IEC 60947-4-1 when used with 3RT1 contactors, enhancing safety by ensuring that the NO and NC contacts cannot be closed at the same time.

Part conditions explained

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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.

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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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