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Siemens 3RH1921-1MA20

Name: 3RH1921-1MA20
Brand: Siemens
SKU: 3RH1921-1MA20
Price: 31.4 GBP
Availability: InStock

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£31.40 (ex. VAT)

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Image shown may not reflect the final product

Marvo Stock ID MV-7C83

HS Code 85365080

SKU 3RH1921-1MA20

Condition New sealed

Warranty 12 months

Weight (kg) 0.03

Length (mm) 51.00

Width (mm) 44.00

Height (mm) 38.00

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Specification & Description

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Commonly Asked Questions

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Specification & Description

Specification	Description
Part Number	3RH1921-1MA20
Alternative Part Number	3RH19211MA20
Manufacturer	Siemens
Product Brand Name	SIRIUS
Product Type	Auxiliary switch block
Number of NC Contacts	2
Number of NO Contacts	0
Contact Type	Instantaneous
Suitability for Use	Contactor relay and power contactor
Protection Class (IP)	IP20
Ambient Temperature (Storage)	-55 ... +80 °C
Ambient Temperature (Operation)	-25 ... +60 °C
Mechanical Service Life	10,000,000 switching cycles
Electrical Endurance (AC-15, 230V)	200,000 switching cycles
Contact Reliability	1 faulty switching per 100 million (17 V, 1 mA)
Insulation Voltage	690 V (with degree of pollution 3)
Surge Voltage Resistance	6 kV
Operational Current (AC-12, 24V)	10 A
Operational Current (AC-12, 230V)	10 A
Operational Current (AC-12, Max)	10 A
Operational Current (AC-14, 125V)	6 A
Operational Current (AC-14, 250V)	6 A
Operational Current (AC-15, 24V)	6 A
Operational Current (AC-15, 230V)	6 A
Operational Current (AC-15, 400V)	3 A
Operational Current (AC-15, 690V)	1 A
Operational Current (DC-12, 24V)	10 A
Operational Current (DC-12, 110V)	3 A
Operational Current (DC-12, 220V)	1 A
Fastening Method	Snap-on mounting
Width	44 mm
Height	38 mm
Depth	51 mm
Electrical Connection Type	Screw-type terminals
Connectable Conductor Cross-Sections	Finely stranded with core end processing: 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
AWG Cables for Auxiliary Contacts	2x (20 ... 16), 2x (18 ... 14)
Mirror Contact Function	Yes (acc. to IEC 60947-4-1)
Positively Driven Operation	No (acc. to IEC 60947-5-1)

The Siemens 3RH1921-1MA20 is a high-quality auxiliary switch block designed to enhance the functionality of motor contactors. This robust component is part of the renowned SIRIUS series, known for its reliability and superior performance in industrial applications. The auxiliary switch block features two normally closed (NC) contacts, making it suitable for a variety of control and signalling tasks.

Engineered to meet EN 50005 standards, the 3RH1921-1MA20 offers a protection class of IP20 on the front, ensuring it is well-protected against dust and other small particles. It operates efficiently within a wide ambient temperature range, from -25°C to +60°C, and can be stored in temperatures as low as -55°C and as high as +80°C. This makes it ideal for use in diverse environmental conditions.

The auxiliary switch block boasts an impressive mechanical service life of up to 10 million switching cycles, and an electrical endurance of approximately 200,000 switching cycles at AC-15 at 230V. It is designed to handle operational currents of up to 10A at 24V and 230V for AC-12 applications, and up to 6A at 230V for AC-15 applications. Additionally, it can manage operational currents at various DC voltages, ensuring versatility in different electrical setups.

Installation is straightforward with its snap-on mounting method, and it features screw-type terminals for secure electrical connections. The compact dimensions of 44mm in width, 38mm in height, and 51mm in depth make it easy to integrate into existing systems without requiring significant space.

The Siemens 3RH1921-1MA20 auxiliary switch block is a reliable and efficient solution for enhancing the control capabilities of motor contactors, providing long-lasting performance and adaptability in a wide range of industrial applications.

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.

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.

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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 primary function of this auxiliary switch block?

The primary function of this auxiliary switch block is to provide additional contacts for motor contactors, enhancing their control capabilities.

What type of contacts does this auxiliary switch block have?

This auxiliary switch block is equipped with 2 normally closed (NC) contacts.

What is the protection class rating for this auxiliary switch block?

The protection class rating for this auxiliary switch block is IP20 on the front.

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

The typical mechanical service life of this auxiliary switch block is 10 million switching cycles.

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

The rated insulation voltage for this auxiliary switch block, with a degree of pollution 3, is 690 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 operational current of the auxiliary contacts at 230 V AC-15?

The operational current of the auxiliary contacts at 230 V AC-15 is 6 A.

What are the ambient temperature ranges for storage and operation?

The ambient temperature range for storage is -55 to +80 °C, and for operation, it is -25 to +60 °C.

What type of mounting method is used for this auxiliary switch block?

This auxiliary switch block uses a snap-on mounting method.

What are the dimensions of this auxiliary switch block?

The dimensions of this auxiliary switch block are 44 mm in width, 38 mm in height, and 51 mm in depth.

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.

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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