*Image shown is a representation only. Actual product may vary.
Siemens 3RH1921-1FA22
by Siemens
Read verified buyer reviews ↓OverviewUpgrade the performance of your industrial control setups with the Siemens 3RH1921-1FA22 SIRIUS Auxiliary Contact Block. This crucial component is expertly designed for smooth integration with SIRIUS contactor relays and power contactors, delivering vital extra switching capabilities. Featuring a flexible 2 normally open (NO) and 2 normally closed (NC) contact arrangement, it provides exceptional adaptability for various control circuits. Its innovative snap-on front mounting design guarantees quick, tool-free installation, reducing downtime and boosting operational efficiency. Engineered for dependable operation in demanding industrial settings, the 3RH1921-1FA22 upholds the superior quality and engineering brilliance associated with the Siemens name. Please note, this model has been discontinued, so securing available inventory is recommended for those seeking this reliable solution.Key Features Flexible Contact Configuration: Includes 2 Normally Open (NO) and 2 Normally Closed (NC) contacts, providing comprehensive control choices. Simple Snap-on Installation: Designed for rapid and straightforward snap-on front mounting, eliminating the need for specialized tools and cutting down installation time. Flawless Compatibility: Perfectly suited for integration with Siemens SIRIUS contactor relays and power contactors, ensuring peak system performance. Robust Construction: Built to endure harsh industrial environments with a durable design and adherence to high-quality manufacturing standards. Improved System Management: Expands the control abilities of your current contactors, offering greater versatility in circuit design. Space-Saving Dimensions: Compact size (44 mm x 38 mm x 51 mm) enables efficient use of panel space. Dependable Operation: Offers a mechanical service life of approximately 10 million switching cycles, guaranteeing long-term operational reliability. Technical Specifications Product Type: Auxiliary Contact Block Manufacturer: Siemens Part Number: 3RH1921-1FA22 Series: SIRIUS Contact Configuration: 2 NO + 2 NC Number of Contacts: 4 Mounting Method: Snap-on front mounting Dimensions (W x H x D): 44 mm x 38 mm x 51 mm Mechanical Service Life: Approximately 10 million switching cycles Electrical Endurance at AC-15 (230 V): Approximately 200,000 switching cycles Operating Temperature Range: -25°C to +60°C Storage Temperature Range: -55°C to +80°C Protection Class: IP20 Standards Compliance: DIN EN 50005, IEC 60947-5-1 Applications Motor Control Circuits: Essential for signaling and interlocking roles in various motor startup and shutdown applications. Industrial Automation Systems: Employed in intricate control panels to provide auxiliary contacts for relays, contactors, and other control units. Process Control: Crucial for implementing safety interlocks and feedback loops in industrial process management systems. HVAC Systems: Enhances control logic in heating, ventilation, and air conditioning setups. Switchgear and Control Panels: Provides critical additional switching points for a broad array of electrical control applications. Machine Building: Used in manufacturing machinery for precise control and monitoring of operational sequences. Why Choose This Model? Proven Siemens Quality: Benefit from the renowned reliability and engineering excellence of Siemens, a global leader in industrial automation. Optimized for SIRIUS Systems: Specifically engineered to integrate seamlessly with the SIRIUS range, ensuring perfect compatibility and performance. Effortless Installation: The snap-on mounting feature significantly simplifies installation, saving valuable time and labor costs. Versatile Control Options: The 2 NO + 2 NC contact configuration provides robust flexibility for intricate control circuit designs. Compact and Efficient: Its small footprint allows for efficient utilization of space within control cabinets, which is critical in crowded industrial settings. Order NowSecure your Siemens 3RH1921-1FA22 SIRIUS Auxiliary Contact Block today to enhance your industrial control systems. As this model is discontinued, seize the opportunity to acquire this reliable component while supplies last.FAQWhat is the contact configuration of the Siemens 3RH1921-1FA22?The Siemens 3RH1921-1FA22 features a 2 Normally Open (NO) and 2 Normally Closed (NC) contact configuration.Is this auxiliary contact block compatible with other Siemens products?Yes, it is specifically designed for seamless integration with Siemens SIRIUS contactor relays and power contactors.How easy is it to install the 3RH1921-1FA22?It features an innovative snap-on front mounting design, ensuring quick, tool-free installation and minimizing downtime.What is the mechanical service life of this unit?The unit provides a mechanical service life of approximately 10 million switching cycles.Is this product still actively manufactured?No, the Siemens 3RH1921-1FA22 has been discontinued, and it is recommended to secure available stock.
USA — Free FedEx Priority & UPS Ground · Worldwide shipping available
For more quantity please contact Customer Service
Fast Shipping
Dispatched quickly on in-stock items via UPS, FedEx & DHL worldwide.
Availability
Thousands of parts in stock — ready for immediate dispatch from Florida.
Payment Flexibility
AMEX, Visa, MasterCard, PayPal, Discover and wire transfer accepted.
Siemens 3RH1921-1FA22
Overview
This is a genuine Siemens component from the SIRIUS Contactors family. PalmPartsSolution stocks it in new, refurbished, and surplus condition with tested warranty and same-day shipping on in-stock units.
Whether you are sourcing a like-for-like replacement for an existing installation, an emergency spare to keep a line running, or a qualified part for a new build, our team can confirm availability, revision, and lead time before you order.
Key Features
- Genuine Siemens catalog part
- Tested before shipment
- Backed by PalmPartsSolution warranty
- Cross-reference and revision assistance available
- Compatible with the broader Siemens automation ecosystem
- Engineered to integrate inside SIRIUS Contactors installations
Compatibility
When ordering, match the full catalog/part number, hardware revision, and firmware revision called out by your Siemens equipment. Where applicable, confirm:
- Input/output voltage and current rating
- Communication protocol and network role
- Mounting form factor and footprint
- Operating temperature, humidity, and IP rating
- Required certifications (UL, CE, ATEX, marine, etc.)
Not sure which revision you need? Send us the catalog number on the nameplate and we will confirm the correct match.
Replacement Information
Three ways to source this part through PalmPartsSolution:
- Exact replacement — same Siemens catalog number, new or refurbished, tested and warrantied
- Form-fit-function equivalent — alternate revision or build that drops in without code changes
- Engineered migration — current-generation Siemens platform with documented conversion notes for the SIRIUS Contactors family
Contact our engineering team if you need help choosing between these tracks.
Technical Specifications
- Product Type: Auxiliary Contact Block
- Manufacturer: Siemens
- Part Number: 3RH1921-1FA22
- Series: SIRIUS
- Contact Configuration: 2 NO + 2 NC
- Number of Contacts: 4
- Mounting Method: Snap-on front mounting
- Dimensions (W x H x D): 44 mm x 38 mm x 51 mm
- Mechanical Service Life: Approximately 10 million switching cycles
- Electrical Endurance at AC-15 (230 V): Approximately 200,000 switching cycles
- Operating Temperature Range: -25°C to +60°C
- Storage Temperature Range: -55°C to +80°C
- Protection Class: IP20
- Standards Compliance: DIN EN 50005, IEC 60947-5-1
Applications
- Motor Control Circuits: Essential for signaling and interlocking roles in various motor startup and shutdown applications.
- Industrial Automation Systems: Employed in intricate control panels to provide auxiliary contacts for relays, contactors, and other control units.
- Process Control: Crucial for implementing safety interlocks and feedback loops in industrial process management systems.
- HVAC Systems: Enhances control logic in heating, ventilation, and air conditioning setups.
- Switchgear and Control Panels: Provides critical additional switching points for a broad array of electrical control applications.
- Machine Building: Used in manufacturing machinery for precise control and monitoring of operational sequences.
Why Choose the 3RH1921-1FA22?
- Proven Siemens Quality: Benefit from the renowned reliability and engineering excellence of Siemens, a global leader in industrial automation.
- Optimized for SIRIUS Systems: Specifically engineered to integrate seamlessly with the SIRIUS range, ensuring perfect compatibility and performance.
- Effortless Installation: The snap-on mounting feature significantly simplifies installation, saving valuable time and labor costs.
- Versatile Control Options: The 2 NO + 2 NC contact configuration provides robust flexibility for intricate control circuit designs.
- Compact and Efficient: Its small footprint allows for efficient utilization of space within control cabinets, which is critical in crowded industrial settings.
Availability & Shipping
- ▸In stock: 3RH1921-1FA22 ready for immediate dispatch from our Florida warehouse.
- ▸Free USA shipping: FedEx Priority (2–5 business days) and UPS Ground (3–5 business days). Expedited options available at checkout.
- ▸Worldwide delivery: FedEx International Priority (1–5 days), UPS International Priority (3–5 days), and USPS International (5–10 days) — rates calculated at checkout.
- ▸Bulk pricing: Volume discounts on request — contact our sales team for quantity quotes.
- ▸Buy with confidence: Every 3RH1921-1FA22 ships with a 1-Year PALM Parts warranty and a 30-day return window.
Frequently Asked Questions — Siemens
Machine down? We ship parts the same day.
New, surplus, and refurbished Siemens inventory in stock. Request a quote or speak directly with an automation specialist for emergency sourcing.
Related Siemens resources
What Verified Buyers Say
No reviews yet for this product. Be the first verified buyer to share your experience — we email a review invitation after every purchase.
Independent Supplier Notice
PALM Parts Solution operates as an independent industrial automation supplier and is not an authorized distributor or affiliate of any listed manufacturer or brand name. Manufacturer trademarks and product names are used solely for identification purposes. Original manufacturer warranties do not apply. All products sold by PALM Parts are backed by our own 1-year warranty.
Product Condition & Firmware
All products are sold as new unless stated otherwise. Original manufacturer packaging may show signs of handling, storage, or shelf wear. Date codes and series may vary from current factory production. PALM Parts does not guarantee the presence, version, or compatibility of any firmware on PLC or automation products.