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Siemens 3RH1921-1CA10
by Siemens
Read verified buyer reviews ↓OverviewThe Siemens 3RH1921-1CA10 SIRIUS Auxiliary Contact Block is a vital element for elevating the performance and adaptability of your Siemens contactors and control systems. Designed for seamless incorporation, this sturdy auxiliary contact block acts as a crucial link for expanding control logic across diverse industrial settings. With its precise arrangement of one normally open (NO) and one normally closed (NC) contact, the 3RH1921-1CA10 facilitates advanced switching processes, making it perfect for motor management, safety mechanisms, and intricate automation sequences. Its innovative snap-on mounting ensures remarkably quick and secure installation, negating the need for complex wiring and minimizing downtime during setup or maintenance. Manufactured to Siemens' stringent quality standards, this compact yet powerful component guarantees dependable operation and resilience in even the most demanding environments, ensuring your systems function efficiently and without interruption.Key Features 1 Normally Open (NO) + 1 Normally Closed (NC) Configuration: Provides versatile circuit expansion for a wide array of control requirements. Simple Snap-On Installation: Supports swift and secure attachment to Siemens contactors, streamlining the setup process. Industrial-Grade Construction: Manufactured with premium materials to endure harsh industrial conditions and ensure a prolonged operational lifespan. Compact, Modular Form Factor: Optimally designed for space-efficient integration within control panels and electrical enclosures. Reliable Electrical Performance: Engineered for consistent operation in applications involving frequent switching cycles. IEC and Industrial Safety Compliant: Adheres to rigorous international and industry safety standards, offering peace of mind. Full Compatibility: Specifically engineered to integrate perfectly with the Siemens SIRIUS series, ensuring optimal system functionality. Technical Specifications Product Category: SIRIUS Auxiliary Contact Block Part Number: 3RH1921-1CA10 Contact Arrangement: 1 Normally Open (NO) + 1 Normally Closed (NC) Mounting Method: Snap-on for Siemens Contactors Electrical Ratings: Standard industrial ratings designed for control circuits Material Composition: High-durability engineering plastic enclosure with superior metal contacts Adherence: Conforms to all pertinent IEC and industrial safety regulations and standards Operating Temperature: Engineered for dependable function across typical industrial temperature ranges Applications Industrial Motor Management: Essential for enhancing contactor capabilities for improved motor starting, stopping, and protection schemes. Machine Automation Systems: Integrates seamlessly into PLC-based and relay logic systems to provide extra switching points for precise control. Process Control Enclosures: Offers dependable and adaptable circuit expansion for automated systems in various industrial processes. Safety Interlocking Circuits: Crucial for implementing robust safety functionalities and emergency stop systems within machinery. HVAC and Building Automation: Delivers trustworthy switching contacts for heating, ventilation, air conditioning, and building management systems. Why Choose This Model? Unmatched Reliability Siemens' reputation for quality assures robust and trustworthy performance in critical industrial operations. Effortless System Expansion Easily augment critical control points to your current Siemens contactor setups without complex re-wiring. Quick and Secure Installation The innovative snap-on design significantly reduces installation time and guarantees a stable connection. Optimized for Industrial Environments Constructed to withstand the rigors of industrial settings, ensuring longevity and consistent operation. Space-Saving Design Its compact design is ideal for efficient panel layouts, maximizing available space. Cost-Effective Solution A durable and long-lasting component that minimizes maintenance needs and maximizes operational uptime. Order NowBoost the functionality of your industrial control systems with the Siemens 3RH1921-1CA10 SIRIUS Auxiliary Contact Block. Contact us today to place your order and ensure top-tier performance for your operations.FAQ What type of contacts does the 3RH1921-1CA10 have? It features one normally open (NO) and one normally closed (NC) contact. Is this auxiliary contact block easy to install? Yes, it features a snap-on mounting design for quick and secure attachment to Siemens contactors. What industrial standards does it comply with? It complies with all relevant IEC and industrial safety standards and regulations. Can it be used with other contactor brands? While designed for seamless compatibility with Siemens SIRIUS series, compatibility with other brands may vary. Please consult technical documentation for specific integration details. What are common applications for this product? It is widely used in industrial motor control, machine automation systems, process control panels, safety interlock circuits, and HVAC systems.
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Siemens 3RH1921-1CA10
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 Category: SIRIUS Auxiliary Contact Block
- Part Number: 3RH1921-1CA10
- Contact Arrangement: 1 Normally Open (NO) + 1 Normally Closed (NC)
- Mounting Method: Snap-on for Siemens Contactors
- Electrical Ratings: Standard industrial ratings designed for control circuits
- Material Composition: High-durability engineering plastic enclosure with superior metal contacts
- Adherence: Conforms to all pertinent IEC and industrial safety regulations and standards
- Operating Temperature: Engineered for dependable function across typical industrial temperature ranges
Applications
- Industrial Motor Management: Essential for enhancing contactor capabilities for improved motor starting, stopping, and protection schemes.
- Machine Automation Systems: Integrates seamlessly into PLC-based and relay logic systems to provide extra switching points for precise control.
- Process Control Enclosures: Offers dependable and adaptable circuit expansion for automated systems in various industrial processes.
- Safety Interlocking Circuits: Crucial for implementing robust safety functionalities and emergency stop systems within machinery.
- HVAC and Building Automation: Delivers trustworthy switching contacts for heating, ventilation, air conditioning, and building management systems.
Why Choose the 3RH1921-1CA10?
-
Unmatched Reliability
Siemens' reputation for quality assures robust and trustworthy performance in critical industrial operations.
-
Effortless System Expansion
Easily augment critical control points to your current Siemens contactor setups without complex re-wiring.
-
Quick and Secure Installation
The innovative snap-on design significantly reduces installation time and guarantees a stable connection.
-
Optimized for Industrial Environments
Constructed to withstand the rigors of industrial settings, ensuring longevity and consistent operation.
-
Space-Saving Design
Its compact design is ideal for efficient panel layouts, maximizing available space.
-
Cost-Effective Solution
A durable and long-lasting component that minimizes maintenance needs and maximizes operational uptime.
Availability & Shipping
- ▸In stock: 3RH1921-1CA10 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 3RH1921-1CA10 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
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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.