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Siemens 3RV2021-4BA20 SIRIUS Motor Protection Circuit Breaker

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Siemens 3RV2021-4BA20

by Siemens

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OverviewThe Siemens 3RV2021-4BA20 SIRIUS Motor Protection Circuit Breaker provides essential safeguarding for electric motors and critical industrial equipment. Engineered for precision and endurance, this three-pole circuit breaker delivers robust protection against overloads, short circuits, and phase loss, ensuring continuous operation and preventing expensive damage. Featuring an adjustable current setting from 13 to 20 Amperes and a 55 kA short-circuit breaking capacity, it guarantees exceptional performance in demanding environments. Its compact S0 size and convenient spring-type terminals make it an ideal choice for integration into control panels and machinery where space is limited.Key Features Adjustable Current Range: Precise adjustment between 13 A and 20 A for customized motor protection. High Breaking Capacity: Offers a substantial 55 kA short-circuit breaking capacity at 400V, enhancing safety during fault conditions. Spring-Type Terminals: Enables quick, secure, and vibration-resistant wiring connections. Compact S0 Frame Size: Optimized for space-saving installation within industrial control panels. Thermal-Magnetic Tripping: Provides dependable and instant protection against overloads and short circuits. Manual Reset and Switching: Allows for direct control and operational adaptability. Global Compliance: Adheres to stringent international standards including IEC/EN 60947-4-1 and -2. Technical Specifications Catalog Number: 3RV2021-4BA20 Frame Size: S0 Number of Poles: 3 Current Setting Range: 13 A to 20 A Short-Circuit Breaking Capacity: 55 kA at 400V Voltage Rating: Up to 690V AC Utilization Category: AC-3 Connection Type: Spring-loaded terminals Tripping Class: Class 10 Protection Class: IP20 Mounting: DIN rail or direct screw mounting Ambient Temperature Range: -20°C to +60°C Weight: Approximately 0.435 kg Certifications: CE, UL, CSA, EAC Country of Origin: Germany Applications Efficient protection for electric motors operating within a 13-20 A current range. Integration into industrial control panels (ICPs) and Motor Control Centers (MCCs). Safeguarding pumps, HVAC systems, and compressor units from electrical faults. Suitable for Machine OEMs requiring compact, highly dependable motor protection solutions. Critical safety component in automation systems and manufacturing processes. Why Choose This Model? Unmatched Reliability: Siemens SIRIUS series products are known for their robust construction and long-term operational stability, minimizing downtime. Superior Protection: Integrated thermal-magnetic tripping ensures comprehensive defense against overloads and short circuits, extending motor lifespan. Installation Efficiency: Spring-type terminals significantly reduce wiring time and complexity, leading to faster commissioning. Space-Saving Design: The S0 frame size allows for optimal panel density, crucial in confined industrial setups. Global Standard Compliance: Adherence to international certifications guarantees suitability for worldwide deployment and regulatory approval. German Engineering Excellence: Manufactured in Germany, ensuring high-quality craftsmanship and rigorous performance testing. Order NowEnhance your motor protection strategy with the Siemens 3RV2021-4BA20 SIRIUS Motor Protection Circuit Breaker. Available for rapid, worldwide shipping to meet your project schedules. For a wider selection, explore our complete range of Siemens SIRIUS Contactors or return to the main Siemens Industrial Automation Products category.FAQWhat is the primary function of the Siemens 3RV2021-4BA20?Its main purpose is to protect electric motors and associated industrial equipment from damage caused by overloads, short circuits, and phase loss.What is the adjustable current range for this circuit breaker?The current can be precisely set between 13 Amperes and 20 Amperes to suit specific motor requirements.What type of terminals does this model use for wiring?It features spring-type terminals, designed for quick, secure, and vibration-resistant wiring connections.Where is the Siemens 3RV2021-4BA20 manufactured?This product is manufactured in Germany, upholding a tradition of high-quality engineering.Can this circuit breaker be used for applications outside of Germany?Yes, it meets various global compliance standards, making it suitable for international deployment.

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PRODUCT DETAILS

Siemens 3RV2021-4BA20

Overview

This is a genuine Siemens component. 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

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:

  1. Exact replacement — same Siemens catalog number, new or refurbished, tested and warrantied
  2. Form-fit-function equivalent — alternate revision or build that drops in without code changes
  3. Engineered migration — current-generation Siemens platform with documented conversion notes

Contact our engineering team if you need help choosing between these tracks.

Technical Specifications

  • Catalog Number: 3RV2021-4BA20
  • Frame Size: S0
  • Number of Poles: 3
  • Current Setting Range: 13 A to 20 A
  • Short-Circuit Breaking Capacity: 55 kA at 400V
  • Voltage Rating: Up to 690V AC
  • Utilization Category: AC-3
  • Connection Type: Spring-loaded terminals
  • Tripping Class: Class 10
  • Protection Class: IP20
  • Mounting: DIN rail or direct screw mounting
  • Ambient Temperature Range: -20°C to +60°C
  • Weight: Approximately 0.435 kg
  • Certifications: CE, UL, CSA, EAC
  • Country of Origin: Germany

Applications

  • Efficient protection for electric motors operating within a 13-20 A current range.
  • Integration into industrial control panels (ICPs) and Motor Control Centers (MCCs).
  • Safeguarding pumps, HVAC systems, and compressor units from electrical faults.
  • Suitable for Machine OEMs requiring compact, highly dependable motor protection solutions.
  • Critical safety component in automation systems and manufacturing processes.

Why Choose the 3RV2021-4BA20?

  • Unmatched Reliability: Siemens SIRIUS series products are known for their robust construction and long-term operational stability, minimizing downtime.
  • Superior Protection: Integrated thermal-magnetic tripping ensures comprehensive defense against overloads and short circuits, extending motor lifespan.
  • Installation Efficiency: Spring-type terminals significantly reduce wiring time and complexity, leading to faster commissioning.
  • Space-Saving Design: The S0 frame size allows for optimal panel density, crucial in confined industrial setups.
  • Global Standard Compliance: Adherence to international certifications guarantees suitability for worldwide deployment and regulatory approval.
  • German Engineering Excellence: Manufactured in Germany, ensuring high-quality craftsmanship and rigorous performance testing.

Availability & Shipping

  • In stock: 3RV2021-4BA20 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 3RV2021-4BA20 ships with a 1-Year PALM Parts warranty and a 30-day return window.
SUPPORT

Frequently Asked Questions — Siemens

Its main purpose is to protect electric motors and associated industrial equipment from damage caused by overloads, short circuits, and phase loss.

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.

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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.

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