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Siemens 3RH1921-1DA11
by Siemens
Read verified buyer reviews ↓OverviewThe Siemens 3RH1921-1DA11 auxiliary contact block is a key element for expanding industrial control circuit functionality. Designed for seamless integration with Siemens 3RH and 3RT contactors, this robust module delivers crucial signal switching. It provides one normally open (NO) and one normally closed (NC) contact, offering versatile control for diverse automation and motor control applications. Operating on a 24V DC supply, the 3RH1921-1DA11 is ideal for modern industrial settings requiring precise and reliable performance. Its compact size ensures efficient use of panel space, making it perfect for new installations and system upgrades.Key Features 1 Normally Open (NO) + 1 Normally Closed (NC) Contact: Delivers adaptable and comprehensive control for various signaling needs. 24V DC Operating Voltage: Guarantees broad compatibility with standard industrial control setups. Clip-On Design for Siemens 3RH/3RT Contactors: Enables fast, tool-free installation and secure attachment, minimizing downtime. Extended Electrical Lifespan: Built for exceptional durability, ensuring consistent switching over long periods. Compact and Space-Saving Footprint: Optimized dimensions allow for efficient use of valuable space within control panels. IEC and UL Compliant: Adheres to strict international safety and performance standards for complete assurance. Screw Connection Terminals: Provides secure and reliable wiring for consistent electrical function. Technical Specifications Model: Siemens 3RH1921-1DA11 Product Type: Auxiliary Contact Block Brand: Siemens Control Voltage: 24V DC Contacts: 1 NO + 1 NC Mounting Type: Clip-on for Siemens 3RH and 3RT contactors Electrical Lifespan: High durability Terminal Type: Screw connection Operating Temperature: -25°C to +60°C Protection Rating: IP20 Applications Industrial Automation Systems: Essential for expanding logic in automated machinery. Motor Control Circuits: Adds signaling and interlocking for electric motors. Signal Transmission and Electrical Isolation: Perfect for dependable signal routing and isolating control circuits. Conveyor Systems: Improves safety and operational control in material handling. HVAC and Building Automation: Utilized in supervisory control systems for environmental management. Process Control: Integral for monitoring and managing various stages in industrial processes. Why Choose? Outstanding Reliability: Constructed with Siemens' renowned quality, ensuring consistent operation in demanding industrial settings. Enhanced System Adaptability: Easily extends the capabilities of existing contactors, optimizing your control system without extensive modifications. Simple Integration: The intuitive clip-on design allows for quick and secure installation, reducing commissioning time. Space Efficiency: Its compact form factor is specifically engineered to fit into tight control panels, maximizing available space. Global Standards Compliance: Meeting both IEC and UL standards, this auxiliary contact block is suitable for a wide range of international uses. Economical Solution: A durable component that lessens maintenance needs and extends system longevity, providing excellent long-term value. Order NowElevate the performance and reliability of your industrial control systems with the Siemens 3RH1921-1DA11 Auxiliary Contact Block. Experience the superior engineering and trusted quality that Siemens delivers. Order now to optimize your automation processes and ensure seamless operation with this essential control component.FAQWhat types of contactors is the Siemens 3RH1921-1DA11 compatible with?It is designed for seamless integration with Siemens 3RH and 3RT contactors.What are the contact configurations of this auxiliary contact block?The unit features one normally open (NO) and one normally closed (NC) contact, providing versatile control options.What is the operating voltage for the Siemens 3RH1921-1DA11?This auxiliary contact block operates on a 24V DC supply, ensuring broad compatibility with standard industrial control systems.How easy is it to install this auxiliary contact block?It features a clip-on design that allows for quick, tool-free installation and secure attachment, minimizing downtime.Does this product meet international safety standards?Yes, it is IEC and UL compliant, adhering to stringent international safety and performance standards for global application.
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Siemens 3RH1921-1DA11
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
- Model: Siemens 3RH1921-1DA11
- Product Type: Auxiliary Contact Block
- Brand: Siemens
- Control Voltage: 24V DC
- Contacts: 1 NO + 1 NC
- Mounting Type: Clip-on for Siemens 3RH and 3RT contactors
- Electrical Lifespan: High durability
- Terminal Type: Screw connection
- Operating Temperature: -25°C to +60°C
- Protection Rating: IP20
Applications
- Industrial Automation Systems: Essential for expanding logic in automated machinery.
- Motor Control Circuits: Adds signaling and interlocking for electric motors.
- Signal Transmission and Electrical Isolation: Perfect for dependable signal routing and isolating control circuits.
- Conveyor Systems: Improves safety and operational control in material handling.
- HVAC and Building Automation: Utilized in supervisory control systems for environmental management.
- Process Control: Integral for monitoring and managing various stages in industrial processes.
Why Choose the 3RH1921-1DA11?
- Outstanding Reliability: Constructed with Siemens' renowned quality, ensuring consistent operation in demanding industrial settings.
- Enhanced System Adaptability: Easily extends the capabilities of existing contactors, optimizing your control system without extensive modifications.
- Simple Integration: The intuitive clip-on design allows for quick and secure installation, reducing commissioning time.
- Space Efficiency: Its compact form factor is specifically engineered to fit into tight control panels, maximizing available space.
- Global Standards Compliance: Meeting both IEC and UL standards, this auxiliary contact block is suitable for a wide range of international uses.
- Economical Solution: A durable component that lessens maintenance needs and extends system longevity, providing excellent long-term value.
Availability & Shipping
- ▸In stock: 3RH1921-1DA11 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 3RH1921-1DA11 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.