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Siemens 3RH1921-2FA31

Name: 3RH1921-2FA31
Brand: Siemens
SKU: 3RH1921-2FA31
Price: 21.67 GBP
Availability: InStock

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£21.67 (ex. VAT)

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Marvo Stock ID MV-7C8D

HS Code 85365080

SKU 3RH1921-2FA31

Condition Used

Warranty 12 months

Weight (kg) 0.04

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	3RH1921-2FA31
Alternative Part Number	3RH19212FA31
Manufacturer	Siemens
Series	3RH
Type	Auxiliary Switch
Mounting	Snap On Mount
Current Rating	10 A
Dimensions	44 x 44 x 40 mm
Number of Contacts	4 (3 Normally Open, 1 Normally Closed)
Contact Type	Instantaneous Switching
Operating Voltage for AC-15	At 230 V: 6 A
Operating Voltage for DC-13	At 24 V: 10 A, At 220 V: 0.3 A
Mechanical Operating Cycles	Typically 10,000,000
Electrical Operating Cycles	Typically 200,000 at AC-15, 230 V
Insulation Voltage	Rated at 690 V with degree of pollution 3
Impulse Voltage Resistance	Rated at 6 kV
Ambient Operating Temperature	-25 to +60 °C during operation
Storage Temperature	-55 to +80 °C
Protection Class	IP20 on the front
Connection Type	Spring-loaded terminals
Conductor Cross-section	For auxiliary contacts: 2x (0.5 ... 1.5 mm²) with conductor end processing, 2x (0.5 ... 2.5 mm²) without
AWG Conductors	For auxiliary contacts: 2x (20 ... 14)
Product Function	Mirror contact to IEC 60947-4-1 (with 3RT1), Not positively driven to IEC 60947-5-1

The Siemens 3RH1921-2FA31 is a high-quality auxiliary switch block designed for seamless integration with contactor relays and power contactors within the S0 to S12 size range. This component is engineered to enhance the functionality of switching motors by providing additional switching capabilities. It features a snap-on mounting design for easy installation and a compact footprint with dimensions of 44 x 38 x 51 mm, ensuring it does not require excessive space within your control cabinet.

Constructed to deliver reliable performance, the 3RH1921-2FA31 auxiliary switch block boasts an impressive mechanical operating life of up to 10 million cycles and an electrical operating life of 200,000 cycles at AC-15, 230 V. It is equipped with 3 normally open (NO) contacts and 1 normally closed (NC) contact, which are capable of handling an operating current of up to 10 A at 24 V in AC-12 applications. The switch block also maintains a high level of contact reliability, with a very low chance of incorrect switching operations, ensuring consistent and dependable operation.

Safety is a priority with this auxiliary switch block, as it includes a mirror contact feature compliant with IEC 60947-4-1 when used with 3RT1 contactors. The device is also rated for an insulation voltage of 690 V with a degree of pollution 3, and an impulse voltage resistance rated at 6 kV, providing robust protection against electrical disturbances.

The 3RH1921-2FA31's electrical connections are designed with spring-loaded terminals, accommodating a range of conductor cross-sections for auxiliary contacts, ensuring secure and reliable connections. This auxiliary switch block is an essential component for those seeking to expand the control capabilities of their motor switching applications with a product that combines efficiency, reliability, and safety.

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 be used with contactor relays and power contactors for switching motors. It provides additional switching contacts, typically for control and signalling functions within a circuit.

Can this auxiliary switch block be used in any specific environmental conditions?

Yes, it is suitable for operating in ambient temperatures ranging from -25°C to +60°C and can be stored in temperatures from -55°C to +80°C.

What are the electrical operating cycles of this auxiliary switch block?

The auxiliary switch block has an electrical operating life of typically 200,000 cycles at AC-15 at 230V.

What type of mounting does this auxiliary switch block support?

This auxiliary switch block supports snap-on mounting, making it easy to install or replace without the need for tools.

What are the dimensions of this auxiliary switch block?

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

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

The insulation voltage rating for this auxiliary switch block, with a degree of pollution 3, is 690V.

Does this auxiliary switch block have a mirror contact feature?

Yes, it does have a mirror contact feature according to IEC 60947-4-1 when used with 3RT1 contactors.

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

The impulse voltage resistance of the auxiliary switch block is rated at 6kV.

What type of electrical connection does this auxiliary switch block use?

The auxiliary switch block uses spring-loaded terminals for the electrical connection.

How many mechanical operating cycles can this auxiliary switch block withstand?

The auxiliary switch block can withstand typically 10 million mechanical operating cycles.

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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