Siemens 3VA1112-4ED32-0AA0 3VA11 Series Distribution Protection Air Circuit Breaker 125A 3P 36kA

The Siemens 3VA1112-4ED32-0AA0 is a robust 3-pole, 125A, 36kA distribution protection air circuit breaker from the 3VA11 series, engineered for reliable performance in demanding industrial environments. This breaker offers superior overcurrent protection and a breaking capacity of 36kA, ensuring the safety and integrity of electrical distribution systems. Its advanced design prioritizes operational efficiency and long-term value, making it a preferred choice for critical infrastructure protection.

Product Specifications

| Parameter                 | Value                               |

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

| Manufacturer              | Siemens                             |

| Series                    | 3VA11                               |

| Product Number            | 3VA1112-4ED32-0AA0                  |

| Rated Current (In)        | 125 A                               |

| Number of Poles           | 3 (3P)                              |

| Breaking Capacity (Icu)   | 36 kA                               |

| Rated Voltage (Ue)        | 400/415 V AC                        |

| Trip Unit Type            | Electronic (ED)                     |

| Auxiliary Contacts        | Yes                                 |

| Accessories               | Suitable for a wide range of accessories |

Core Features & Market Positioning

The Siemens 3VA1112-4ED32-0AA0 distinguishes itself with its high breaking capacity of 36kA, providing a significant safety margin for fault current interruption in industrial power distribution. The integrated electronic trip unit (ED) offers adjustable overcurrent protection settings, allowing for precise system coordination and enhanced selectivity, thereby minimizing downtime during faults. This breaker is positioned as a reliable and cost-effective solution for medium-capacity distribution applications where robust protection and Siemens' renowned quality are paramount. Its compact design also facilitates efficient panel space utilization.

Key Application Scenarios

This air circuit breaker is ideally suited for protecting main feeders, outgoing feeders, and motor circuits in a variety of industrial settings. Common applications include manufacturing plants, chemical processing facilities, data centers, and building services, where consistent power supply and equipment protection are critical. The 125A rating and 36kA breaking capacity make it a versatile choice for protecting equipment with moderate to high fault current potential. Its robust construction ensures reliable operation even in harsh environmental conditions.

Practical System Integration Guidance

Integrating the Siemens 3VA1112-4ED32-0AA0 into existing systems is straightforward due to its standard mounting dimensions and terminal configurations. The breaker is designed for panel mounting and features clearly labeled terminals for line and load connections. For optimal performance, ensure that the upstream and downstream protection devices are properly coordinated with the adjustable settings of the electronic trip unit. Wiring for auxiliary contacts and communication modules (if applicable) should follow the guidelines in the product manual to enable advanced monitoring and control functions.

Operation and Risk Mitigation

Safe operation of the Siemens 3VA1112-4ED32-0AA0 relies on adherence to proper installation and maintenance procedures. Before performing any work, ensure the breaker is de-energized and all safety protocols are followed. The electronic trip unit allows for testing of its functionality, which is recommended during commissioning and periodic maintenance. In the event of a trip, investigate the cause of the overcurrent or short circuit before attempting to reset the breaker. Common fault indicators on the trip unit can help diagnose the issue. Always consult the official Siemens documentation for detailed troubleshooting guidance and error code explanations.

Scalability & Long-Term Value

The 3VA11 series, including the 3VA1112-4ED32-0AA0, offers inherent scalability through its compatibility with a wide range of Siemens accessories and communication modules. This allows for future upgrades to advanced monitoring, diagnostics, and integration into digital industrial ecosystems (IIoT). By investing in this breaker, facilities can ensure long-term protection and operational continuity, with the ability to adapt to evolving network requirements and smart grid functionalities. The robust design also contributes to a longer service life and reduced total cost of ownership.

Frequently Asked Questions

Q1: What is the breaking capacity of the Siemens 3VA1112-4ED32-0AA0?

The Siemens 3VA1112-4ED32-0AA0 features a robust breaking capacity of 36kA. This ensures it can safely interrupt fault currents up to this level. It provides a high degree of protection for electrical distribution systems.

This high breaking capacity is crucial for preventing damage to downstream equipment. It also enhances overall system safety in industrial environments. Proper coordination with upstream devices is essential for optimal protection.

The 36kA rating is a key specification for fault level assessment in project design. It allows engineers to specify appropriate protection for critical loads.

Q2: Can this breaker be used for motor protection?

Yes, the Siemens 3VA1112-4ED32-0AA0 can be utilized for motor protection. Its electronic trip unit offers adjustable overload and short-circuit settings. These settings can be configured to match motor starting characteristics.

Careful adjustment of the trip unit parameters is necessary for effective motor protection. This includes setting the thermal overload and instantaneous trip levels appropriately. Consult motor data for correct settings.

The breaker's ability to provide selective protection is also beneficial in motor control circuits. It helps isolate faults without tripping adjacent circuits unnecessarily.

Q3: What type of trip unit does the 3VA1112-4ED32-0AA0 use?

This circuit breaker is equipped with an electronic trip unit (ED type). The electronic trip unit provides advanced overcurrent protection capabilities. It allows for precise adjustment of protection parameters.

The ED trip unit offers adjustable settings for thermal overload (long-time delay) and short-circuit protection. This flexibility enables accurate system coordination and selectivity. It often includes earth fault protection options as well.

This advanced tripping technology enhances system reliability and minimizes nuisance tripping compared to thermal-magnetic breakers. It allows for customized protection schemes tailored to specific applications.

Q4: Is the Siemens 3VA1112-4ED32-0AA0 suitable for AC or DC applications?

The Siemens 3VA1112-4ED32-0AA0 is designed for AC (Alternating Current) applications. Its specifications, such as rated voltage (400/415 V AC) and breaking capacity, are defined for AC systems. It is not intended for DC (Direct Current) use.

Using this breaker in DC systems would compromise its performance and safety. DC arc extinction differs significantly from AC, and standard AC breakers may not be able to interrupt DC faults effectively. Always use breakers rated for the specific system type.

For DC applications, a dedicated DC circuit breaker with appropriate ratings and arc quenching capabilities must be selected. Ensure the breaker's intended application matches the electrical system requirements.

Q5: What are the dimensions of the 3VA1112-4ED32-0AA0 circuit breaker?

While specific external dimensions are typically found in datasheets, the 3VA11 series is known for its compact design. This facilitates space-saving installations in electrical panels. Its standard mounting footprint allows for easy replacement of similar-sized breakers.

The compact form factor is a significant advantage in crowded electrical cabinets. It allows for higher power density within a given enclosure size. This can reduce overall panel costs and footprint.

For precise installation planning, refer to the official Siemens technical documentation for detailed dimensional drawings and mounting instructions. Accurate measurements are crucial for proper panel integration.

Q6: How do I adjust the trip settings on the electronic trip unit?

Trip settings on the electronic trip unit are typically adjusted via integrated controls or optional communication modules. These controls allow for setting the rated current, overload trip class, and short-circuit thresholds. Consult the product manual for specific adjustment procedures.

The adjustment process involves setting parameters like Iu (rated current), Ir (long-time pickup), Iti (long-time delay), Isd (short-time pickup), and tsd (short-time delay). Proper configuration ensures correct protection and selectivity.

It is crucial to understand the implications of each setting and ensure they are coordinated with upstream and downstream protective devices. Incorrect settings can lead to nuisance tripping or inadequate protection.

Q7: Can auxiliary contacts be added to the Siemens 3VA1112-4ED32-0AA0?

Yes, the Siemens 3VA1112-4ED32-0AA0 is designed to accommodate various accessories, including auxiliary contacts. These contacts provide status indication (e.g., tripped, closed) for remote monitoring or integration into control systems. They are typically plug-in modules.

Auxiliary contacts are essential for building sophisticated control and monitoring schemes. They allow for remote signaling of the breaker's operational status. This is vital for automated systems and SCADA applications.

Installation of accessories usually requires referring to the product manual for correct module placement and wiring. Ensure compatibility of the accessory with the specific breaker model and series.

Q8: What is the significance of the 'ED' in the product code 3VA1112-4ED32-0AA0?

The 'ED' in the product code signifies that this circuit breaker features an Electronic Trip Unit. This indicates advanced protection capabilities beyond basic thermal-magnetic tripping. Electronic trip units offer greater flexibility and precision.

This type of trip unit allows for adjustable settings for various protection functions like overload, short-circuit, and sometimes earth fault. It provides more sophisticated fault detection and discrimination. It is crucial for modern industrial applications.

Electronic trip units can also often support communication interfaces for integration into digital monitoring systems. This enables remote diagnostics and data logging, contributing to Industry 4.0 initiatives.

Q9: How does the 36kA breaking capacity protect my system?

The 36kA breaking capacity means the Siemens 3VA1112-4ED32-0AA0 can safely interrupt a fault current up to 36,000 Amperes. This is a critical safety feature that prevents catastrophic damage during severe short circuits. It limits the energy let-through to downstream components.

When a fault occurs, the breaker opens its contacts very rapidly to break the circuit. A higher breaking capacity ensures the breaker can handle the immense energy of a fault without failing internally. This protects personnel and assets.

This rating is essential for compliance with electrical codes and standards. It ensures that the protective device is adequately sized for the potential fault levels at its installation point within the electrical distribution network.

Q10: Is the Siemens 3VA1112-4ED32-0AA0 compatible with IIoT platforms?

Yes, the Siemens 3VA1112-4ED32-0AA0, particularly when equipped with optional communication modules, can be integrated with IIoT platforms. This enables advanced monitoring, diagnostics, and predictive maintenance capabilities. It transforms the breaker into a smart device.

Integration typically occurs via communication protocols like Modbus or PROFINET, allowing data exchange with SCADA systems or cloud-based IIoT solutions. This provides real-time insights into electrical system health. It is key for smart grids and Industry 4.0.

This connectivity facilitates remote asset management, energy analysis, and fault prediction, leading to optimized operational efficiency and reduced downtime. It enhances the long-term value and intelligence of the electrical infrastructure.