Siemens 3RH1921-1HA22

Siemens 3RH1921-1HA22 

The Siemens 3RH1921-1HA22 is an auxiliary switch block that plays a critical role in enhancing the functionality of motor contactors. As a component of the SIRIUS product brand, this auxiliary switch block is designed for use with contactor relays and power contactors in the Size S0 to S3 range.

General Technical Data:

The 3RH1921-1HA22 boasts a robust construction with an IP20 protection class on the front, ensuring a degree of protection against solid objects and providing a safe operating environment. It exhibits a commendable mechanical service life, with a switching cycle capability of approximately 10,000,000 cycles, underlining its durability in industrial applications.

The operational temperature range of -25 to +60 °C makes it adaptable to varying environmental conditions during operation, while its storage temperature range of -55 to +80 °C reflects its resilience in storage.

Auxiliary Circuit Specifications:

The auxiliary switch block is equipped with 2 Normally Open (NO) and 2 Normally Closed (NC) contacts, meeting EN 50012 standards. These instantaneous contacts contribute to the versatility of the auxiliary circuit, allowing for precise control in various operational scenarios.

The reliability of the auxiliary contacts is noteworthy, with a low occurrence of faulty switching at 1 per 100 million operations (17 V, 1 mA). The insulation voltage of 690 V ensures a high degree of safety in the auxiliary circuit.

Operating Current Specifications:

The 3RH1921-1HA22 exhibits a wide range of operating current specifications for auxiliary contacts in both AC and DC scenarios. For AC-12, AC-14, AC-15, DC-12, and DC-13, the drive showcases its flexibility by accommodating various voltage levels and current paths. With rated values ranging from 1 A to 10 A, it caters to diverse applications with distinct current requirements.

Installation and Dimensions:

The switch block follows a snap-on mounting type, simplifying installation procedures. With dimensions of 44 mm (width), 38 mm (height), and 51 mm (depth), it maintains a compact profile, contributing to ease of integration into control panels or motor control centers.

Connections and Terminals:

The screw-type terminals facilitate secure electrical connections for both auxiliary and control current circuits. The connectable conductor cross-sections, supporting finely stranded and AWG conductors, enable compatibility with various wiring configurations.

Safety Features:

The 3RH1921-1HA22 incorporates safety-related features such as a mirror contact according to IEC 60947-4-1. It is essential for ensuring the reliability and safety of the overall control system.

In summary, the Siemens 3RH1921-1HA22 auxiliary switch block stands as a reliable and versatile component in motor control applications. Its robust design, wide-ranging specifications, and safety features make it a valuable asset in industrial settings where precision and durability are paramount.

Frequently Asked Questions about Siemens 3RH1921-1HA22 Auxiliary Switch Block

1. What is the primary application of the Siemens 3RH1921-1HA22 auxiliary switch block?

The 3RH1921-1HA22 is designed for use with contactor relays and power contactors, specifically in the Size S0 to S3 range. It enhances the functionality of these components in motor control applications.

2. What standards does the auxiliary switch block meet?

The switch block meets EN 50012 standards, ensuring compliance with industry regulations and standards for auxiliary switch blocks.

3. What is the protection class of the 3RH1921-1HA22 on the front, and what does it mean?

The switch block has an IP20 protection class on the front, indicating protection against solid objects with a diameter larger than 12.5 mm. This ensures a safe operating environment in industrial settings.

4. What is the operational temperature range of the 3RH1921-1HA22?

The switch block can operate in temperatures ranging from -25 to +60 °C, making it adaptable to varying environmental conditions during operation.

5. How many switching cycles can the 3RH1921-1HA22 handle, and what is its mechanical service life?

The switch block has a mechanical service life of approximately 10,000,000 switching cycles, emphasizing its durability and long-lasting performance in industrial applications.

6. What is the insulation voltage of the auxiliary contacts?

The insulation voltage with a degree of pollution 3 at AC rated value is 690 V, ensuring a high level of safety in the auxiliary circuit.

7. How reliable are the auxiliary contacts, and what is the rate of faulty switching?

The auxiliary contacts exhibit a high level of reliability, with only 1 faulty switching per 100 million operations (17 V, 1 mA), underscoring the switch block's precision and dependability.

8. What types of currents and voltages can the 3RH1921-1HA22 handle in its auxiliary circuit?

The switch block is versatile in handling various currents and voltages, including AC-12, AC-14, AC-15, DC-12, and DC-13, with rated values ranging from 1 A to 10 A, catering to diverse application requirements.

9. What is the installation type of the 3RH1921-1HA22, and what are its dimensions?

The switch block follows a snap-on mounting type for easy installation. It has dimensions of 44 mm (width), 38 mm (height), and 51 mm (depth), contributing to a compact profile for integration into control panels or motor control centers.

10. Does the 3RH1921-1HA22 incorporate any safety features?

Yes, the switch block includes safety-related features such as a mirror contact according to IEC 60947-4-1, contributing to the overall reliability and safety of the control system.

Siemens products are manufactured in Germany and are designed for Automotive, aerospace, power generation, and electronics usage. They come with a 2-year warranty from MRO Electric. We also carry Contactors from other manufacturers such as FANUC and Yaskawa.

Contact Us Today For More Information About Siemens Products

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at sales@mroelectric.com, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 3RH1921-1HA22, take a look at more from our Contactors line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 3RH1921-1HA22 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.