Siemens 3VA1112-6ED32-0AA0 Molded Case Air Circuit Breaker 125A 3P 70kA

The Siemens 3VA1112-6ED32-0AA0 molded case air circuit breaker stands as a robust and reliable solution for comprehensive overcurrent and short-circuit protection in a wide array of industrial and commercial applications. This 125A, 3-pole breaker boasts a significant interrupting capacity of 70kA, ensuring superior safety and system integrity even under demanding fault conditions. Its advanced thermal-magnetic trip unit offers precise and dependable protection, making it an indispensable component for safeguarding electrical installations.

Product Specifications

| Parameter                    | Specification                               |

| :--------------------------- | :------------------------------------------ |

| Product Type                 | Molded Case Air Circuit Breaker             |

| Model Number                 | 3VA1112-6ED32-0AA0                          |

| Rated Current (In)           | 125A                                        |

| Number of Poles              | 3P                                          |

| Rated Ultimate Short-Circuit Breaking Capacity (Icu) | 70kA                                        |

| Tripping Unit Type           | Thermal-Magnetic                            |

| Mounting Type                | Fixed                                       |

| Connection Type              | Lug terminals                               |

| Mechanical Endurance         | 20,000 switching cycles                     |

| Electrical Endurance         | 8,000 switching cycles                      |

| Standard Compliance          | IEC 60947-2                                 |

Core Features & Market Positioning

The Siemens 3VA1112-6ED32-0AA0 distinguishes itself through its high interrupting capacity, crucial for fault-tolerant electrical systems. Its thermal-magnetic tripping mechanism provides a cost-effective yet highly reliable method for detecting overloads and short circuits, a feature highly valued in cost-conscious industrial environments. The compact design of the 3VA series also allows for efficient space utilization within electrical panels, a significant advantage in densely populated switchgear. This breaker is positioned as a dependable workhorse, offering a balance of performance, reliability, and value for essential power distribution and protection tasks.

Key Application Scenarios

This Siemens 3VA1112-6ED32-0AA0 circuit breaker is exceptionally well-suited for protecting main feeders and branch circuits in commercial buildings, industrial plants, and data centers. It is a prime choice for safeguarding motor control centers, distribution boards, and critical equipment where high fault currents are anticipated. Its 70kA interrupting rating makes it ideal for installations where the prospective short-circuit current is substantial, ensuring robust protection for downstream electrical components and personnel.

Practical System Integration Guidance

Installation of the Siemens 3VA1112-6ED32-0AA0 involves securely mounting the breaker onto a standard DIN rail or a panel-mounting plate. Ensure all power connections are made to the designated lug terminals, adhering to local electrical codes and torque specifications for secure connections. Before energizing, verify that the breaker is in the "OFF" position and that all adjacent components are correctly installed and insulated. For systems requiring remote monitoring or control, auxiliary and alarm switches can be field-installed into designated slots, enabling integration with SCADA or building management systems.

Operation and Risk Mitigation

Proper operation of the Siemens 3VA1112-6ED32-0AA0 circuit breaker relies on understanding its thermal-magnetic trip characteristics. The thermal element provides protection against sustained overloads by responding to the heat generated by current flow, while the magnetic element offers instantaneous tripping for severe short-circuit events. To mitigate risks, regularly inspect the breaker for physical damage, ensure ventilation pathways are clear, and perform periodic functional tests to confirm correct operation. Avoid manually resetting the breaker if it has tripped due to a short circuit without first identifying and rectifying the fault condition.

Scalability & Long-Term Value

The Siemens 3VA1112-6ED32-0AA0 is part of a broader family of 3VA circuit breakers, offering a degree of scalability for systems that may evolve. While this specific model is fixed, the 3VA series accommodates various accessories such as auxiliary and alarm switches, undervoltage releases, and shunt trips, allowing for enhanced functionality and integration into more complex control schemes. Its robust construction and adherence to international standards ensure a long operational lifespan, contributing to the long-term value and reliability of the electrical installation. Integration with digital monitoring solutions via accessory modules can further enhance its value in IIoT environments.

FAQs

Q1: What is the primary function of the Siemens 3VA1112-6ED32-0AA0 circuit breaker?

This breaker is designed to protect electrical systems from overcurrents. It interrupts circuits during overloads and short circuits. Its main goal is to prevent damage to equipment and ensure safety.

It provides essential protection for feeders and distribution circuits. This includes industrial, commercial, and infrastructure applications. The 70kA rating is key for high fault current scenarios.

The thermal-magnetic trip unit offers reliable detection of fault conditions. This ensures timely disconnection of power, safeguarding downstream components.

Q2: What does the 70kA interrupting capacity signify for this breaker?

A 70kA rating means the breaker can safely interrupt a fault current of 70,000 amperes. This is a critical safety parameter for system protection. It indicates the maximum fault current it can handle.

Installations with higher fault current levels require such breakers. This ensures the breaker doesn't fail catastrophically during a severe short circuit. It is vital for protecting upstream components as well.

This high rating is essential in areas with significant power generation or transformer capacity. It provides a robust safety margin in demanding electrical environments.

Q3: Can this Siemens breaker be used for motor protection?

Yes, the thermal-magnetic trip unit can be adjusted for motor protection. The thermal element provides overload protection. It must be set according to motor full-load current.

The magnetic element offers short-circuit protection for the motor and wiring. Proper setting is crucial to avoid nuisance tripping during startup. Consult motor nameplate data for settings.

However, for specialized motor control needs, dedicated motor protection circuit breakers might be considered. This 3VA breaker offers a solid general-purpose solution.

Q4: How do I install the Siemens 3VA1112-6ED32-0AA0 breaker?

Mount the breaker securely onto a DIN rail or panel. Ensure a stable and vibration-free mounting surface. Follow manufacturer guidelines for mounting hardware.

Connect incoming and outgoing power conductors to the lug terminals. Use appropriate size conductors and torque them to specifications. Verify correct polarity and phase rotation.

Before energizing, ensure the breaker is in the OFF position. Perform a visual inspection and confirm all connections are tight and insulated properly.

Q5: What are the main benefits of using a Siemens 3VA series breaker?

The 3VA series offers high reliability and robust construction. They are designed for long operational life and consistent performance. This ensures system uptime and reduces maintenance.

They provide excellent protection against overloads and short circuits. The range offers various interrupting capacities to suit different applications. This flexibility is a key advantage.

Compact design and modular accessories enhance installation and expandability. They integrate well into modern switchgear designs.

Q6: Is this circuit breaker suitable for DC applications?

No, the Siemens 3VA1112-6ED32-0AA0 is designed for AC applications only. It adheres to standards for AC circuit protection. Using it in DC systems can lead to malfunction or failure.

AC circuit breakers operate differently than DC breakers. Arc interruption in DC circuits is more challenging. Dedicated DC breakers are required for such systems.

Always verify the intended application and voltage type for any circuit breaker. Using the wrong type can be a significant safety hazard.

Q7: What type of trip unit does this breaker feature?

This breaker features a thermal-magnetic trip unit. It combines two protection mechanisms in one device. This is a common and reliable protection method.

The thermal element detects sustained overcurrents (overloads). It works based on bimetallic strip heating. This provides time-delayed protection.

The magnetic element detects sudden, high-level overcurrents (short circuits). It provides instantaneous trip action for severe faults. This ensures rapid disconnection.

Q8: Where can I find the manual for the Siemens 3VA1112-6ED32-0AA0?

The official Siemens support website is the primary source. Search for the product model number on their portal. Product documentation is usually available for download there.

You can also try industrial automation distributors or electrical component suppliers. They often provide links to manufacturer documentation for products they sell. Ensure it's the latest version.

Refer to the manual for detailed installation, operation, and maintenance instructions. It contains critical safety information and technical specifications.

Q9: What accessories are available for this breaker?

Several accessories enhance the functionality of the 3VA1112-6ED32-0AA0. These include auxiliary switches for signaling status. Alarm switches can indicate trip events.

Undervoltage releases can trip the breaker when voltage drops. Shunt trips allow remote tripping via a control signal. Rotary handles are available for external operation.

These accessories allow for integration into control systems and remote monitoring. They enhance the breaker's versatility in complex installations.

Q10: What are the dimensions of the Siemens 3VA1112-6ED32-0AA0?

The exact dimensions can vary slightly based on mounting and accessories. However, it's a standard molded case circuit breaker size. Consult the product datasheet for precise measurements.

The 3VA series is known for its compact footprint. This allows for efficient use of space within electrical enclosures. This is a significant advantage for panel builders.

Typically, it fits standard panel cutouts and mounting systems. This ensures compatibility with most switchgear designs.