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Siemens SIRIUS MPCB: Choosing the Right 3RV/3VU

July 6, 2025

German technology conglomerate Siemens is always at the forefront of delivering industrial automation, building automation, rail transport, and even health technologies. One of its products is the SIRIUS MPCB Siemens consumers prefer over others in the market. 

The SIRIUS MPCB from Siemens is a motion protection circuit breaker that combines the working principle of a motor starter, as well as the traditional circuit breaker, offering short-circuit and phase failure protection, among others. 

Hero Product Highlight SIRIUS 3RV6/3RV5
SIRIUS 3RV6/3RV5
Manufacturer: Siemens
Model: SIRIUS 3RV6/3RV5
Type: Motor Protection Circuit Breakers
Relay application: Power up to 45 kW at 400V AC or Rated current up to 100A Switching and protection
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However, what are the guidelines when selecting the right product from Siemens’ 3RV MPCB catalog, as well as Siemens’ MPCB 3VU catalog? Find out in this discussion that will tackle the following:

– The Siemens SIRIUS modular system

– The 3RV MPCB Siemens series

– How to use the Siemens MPCB selection chart

– Type 1 vs. Type 2 coordination + what they mean for your panel

– Where to source this Siemens product

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The Siemens SIRIUS Modular System: Overview

The SIRUS modular system is branded by Siemens as its biggest portfolio it has. It encompasses the largest switching and protection portfolio not found elsewhere in the industry. 

Thanks to the wealth of capabilities contained within the devices, these systems could be used in a wide range of applications

For one, CAx data is made available across, plus users could draw on the most comprehensive, standard-compliant configuration support. These two features merge together to simplify your workflow and speed up the electrical engineering processes in your industry. 

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The 3RV Series: The Modern Standard for Motor Feeders

Note that the availabilities of plants and machines are pre-conditions for relentless productivity. These entities must therefore be protected reliably versus issues with the power supply system. In the event of failures, the 3RV MPCB Siemens series helps. 

This series pertains to a range of SIRIUS motion protection circuit breakers, as discussed earlier. Such devices are crafted to protect your electric motors from overcurrents and short circuiting. Thus, your industries could get overall safety and reliability for your automation systems. 

Furthermore, these tools are also utilized to disconnect the power supply to a motor when faults are detected, preventing damage to your motor and other equipment. 

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How to Use the Siemens MPCB Selection Chart

Siemens has a selection chart for its MPCBs for proper utilization. To successfully use the Siemens MPCB selection chart, follow these steps:

  • Collect motor data: First and foremost, identify the rated current, voltage, starting method, and the expected short-circuit current of your motor at the site.
  • Consult the chart: This is the only time you can consult the selection chart. Choose the right Siemens MPCB selection chart for your intended application. Be sure to find the current and voltage so you can locate the recommended MPCB model and rating. 
  • Think of the backup protection: Shold the short-circuit current of the chart exceeds the breaking capacity of the MPCB, choose the specified backup fuse from your chart.
  • Consider voltage and other entities: Lastly, make it certain that the voltage rating of your MPCB matches or even exceeds that of the motor. You should likewise consider ambient temperature or requirements specific to the installation.

For more information on this, check out the Siemens MPCB price list, Siemens MPCB catalog PDF files or the Siemens MPCB 3VU catalog documents.

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Type 1 vs. Type 2 Coordination: What it Means for Your Panel

Simply put, a Type 1 or Type I coordination is, wherein, under short circuit disturbances, the equipment shall cause no danger to people or installation, and they may not be suitable for further services without repair and replacement parts. 

Meanwhile, Type 2 or Type II coordinations are, wherein, the equipment also causes no danger to people or installation, and not sustainable for further use. However, the risk of contact welding is present, so manufacturers must indicate the measures that should be taken with regards to the maintenance of the equipment.

Sourcing Out Your Siemens SIRIUS MPCB

When it comes to sourcing out your SIRIUS MPCB equipment, especially when your industry is located in Europe and the Middle East, consider choosing this company, SIMPLYBUY

Our company is the top shop featuring catalogs that champion the guiding tenets for industrial excellence. Our mission: utilize global expertise to simplify industrial procurement. Our vision: to always be your one-stop platform for high-end industrial control products. 

We make it easier for industries to outsource their protection needs without having to jump from one brand to the other. We feature Siemens’ standardized selection process so we could connect with customers’ actual usage scenarios and help you choose quickly and accurately. For more information, contact our team today.

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