Siemens 3VA1220-6EF32-0AA0 Molded Case Circuit Breaker 250A 3P 55kA
The Siemens 3VA1220-6EF32-0AA0 is a robust 3-pole molded case circuit breaker designed for reliable circuit protection in demanding industrial environments. This 250A breaker boasts a significant breaking capacity of 55kA, ensuring safe interruption of fault currents. Its advanced thermal-
Siemens 3VA1220-6EF32-0AA0: Product Specifications
| Parameter | Specification |
| :------------------------- | :------------------------------------------ |
| Product Type | Molded Case Circuit Breaker (MCCB) |
| Manufacturer | Siemens |
| Model Number | 3VA1220-6EF32-0AA0 |
| Number of Poles | 3-pole |
| Rated Current (In) | 250 A |
| Breaking Capacity (Icu) | 55 kA at 400/415V |
| Trip Unit Type | Electronic (ETU) |
| Trip Unit Setting Range | Adjustable from 0.4 to 1.0 x In |
| Voltage Rating (Ue) | Up to 690 V AC |
| Frequency | 50/60 Hz |
| Mounting Type | Fixed, direct mounting |
| Protection Functions | Overload, Short Circuit, Ground Fault |
| Standards Compliance | IEC 60947-2, UL 489 (when applicable) |
| Terminal Type | Screw terminals |
| Accessories | Wide range of auxiliary and signaling switches |
Core Features & Market Positioning
The Siemens 3VA1220-6EF32-0AA0 distinguishes itself through its advanced electronic trip unit (ETU), which provides highly accurate and adjustable overcurrent protection. This differentiates it from basic thermal-magnetic breakers, offering superior selectivity and reduced nuisance tripping in industrial settings. Its 55kA breaking capacity at 400/415V positions it as a high-performance solution for critical power distribution panels where robust fault current interruption is paramount. Siemens' reputation for quality and reliability further strengthens its market position, making the 3VA1220 series a preferred choice for engineers prioritizing safety and operational continuity.
Key Application Scenarios
This Siemens molded case circuit breaker is ideally suited for main and branch circuit protection in industrial facilities, commercial buildings, and data centers. Its high breaking capacity makes it an excellent choice for protecting critical loads in power distribution boards, motor control centers, and substations. Applications include safeguarding generators, transformers, and busbars against damaging overcurrents and short circuits, ensuring uninterrupted power supply and equipment longevity.
Practical System Integration Guidance
Integrating the Siemens 3VA1220-6EF32-0AA0 involves secure mounting onto a suitable panel or switchboard using its fixed, direct mounting mechanism. Proper torque must be applied to the screw terminals to ensure a reliable electrical connection, preventing overheating and potential failures. Configuration of the electronic trip unit's settings (overload, short-circuit, and ground-fault thresholds) should be performed by qualified personnel, referencing the detailed operating manual to match the specific load requirements and upstream/downstream protection coordination. The breaker is compatible with a wide array of Siemens auxiliary and signaling switches, allowing for remote monitoring and control, enhancing system manageability.
Operation and Risk Mitigation
Safe operation of the Siemens 3VA1220-6EF32-0AA0 relies on adherence to established electrical safety protocols and manufacturer guidelines. Before performing any maintenance or inspection, always ensure the circuit breaker is de-energized and properly locked out. The breaker's trip-free mechanism prevents the breaker from being held closed on an overload or short circuit, a critical safety feature. Common troubleshooting involves checking for correct trip settings, verifying terminal connections for tightness, and inspecting for any physical damage. Detailed fault codes, if indicated by accessory modules, require consultation with Siemens technical support for precise diagnosis.
Scalability & Long-Term Value
The Siemens 3VA1220-6EF32-0AA0 offers significant long-term value through its compatibility with the broader Siemens industrial automation ecosystem. Its modular design allows for easy addition of accessories such as auxiliary switches, alarm switches, and communication modules, enabling future upgrades for enhanced monitoring and integration with Industrial Internet of Things (IIoT) platforms. This scalability ensures that the circuit breaker can adapt to evolving system requirements and advanced digital control strategies, providing a future-proof protection solution.
Frequently Asked Questions (FAQs)
What is the breaking capacity of the Siemens 3VA1220-6EF32-0AA0?
The Siemens 3VA1220-6EF32-0AA0 features a substantial breaking capacity of 55 kA.
This high rating ensures it can safely interrupt severe short-circuit currents, protecting electrical systems and preventing catastrophic damage.
This specification is critical for applications in areas with high fault current potential, such as industrial substations.
How do I adjust the trip settings on the Siemens 3VA1220-6EF32-0AA0?
Adjustment is typically done via the electronic trip unit's control interface.
Qualified personnel must consult the product manual for specific instructions on setting overload, short-circuit, and ground-fault thresholds.
These settings are crucial for ensuring proper selectivity and protecting downstream equipment without nuisance tripping.
Can this circuit breaker be used for motor protection?
Yes, with appropriate settings on its electronic trip unit, it can provide effective motor protection.
The adjustable overload and short-circuit functions allow for customization to protect motors against locked rotor conditions and other faults.
Specific motor protection settings should be derived from motor nameplate data and relevant standards like IEC 60947-4-1.
What are the dimensions of the Siemens 3VA1220-6EF32-0AA0?
Detailed dimensional drawings are available in the official Siemens product catalog and technical documentation.
These dimensions are critical for panel layout and ensuring proper clearances within switchgear assemblies.
Accurate measurement is essential for physical integration into existing or new electrical installations.
What is the difference between thermal and electronic trip units in Siemens MCCBs?
Thermal trip units offer basic, fixed overcurrent protection, often less precise.
Electronic trip units provide adjustable, highly accurate protection with multiple configurable settings for overload and short circuits.
The 3VA1220-6EF32-0AA0 utilizes an electronic trip unit for superior performance and adaptability.
Is the Siemens 3VA1220-6EF32-0AA0 suitable for DC applications?
This specific model is primarily designed and rated for AC applications.
Using it in DC systems requires careful consideration of specific DC ratings and potential modifications, which may not be supported.
Always verify the application suitability with Siemens technical support for DC circuit protection requirements.
What accessories are available for the 3VA1220-6EF32-0AA0?
A range of accessories includes auxiliary switches, alarm switches, and communication modules for remote signaling and monitoring.
These modules enhance the breaker's functionality, enabling integration into SCADA systems or building management systems.
Proper selection of accessories is key for optimizing system control and diagnostics.
How do I perform a test on the Siemens 3VA1220-6EF32-0AA0?
Functional testing can be performed using specialized test equipment designed for circuit breakers.
The electronic trip unit often includes a built-in test function for basic verification of trip elements.
Refer to the operational manual for specific testing procedures and safety precautions.
What standards does the Siemens 3VA1220-6EF32-0AA0 comply with?
It generally complies with IEC 60947-2 for low-voltage switchgear and controlgear.
UL 489 compliance may also be applicable depending on the specific variant and intended market.
Adherence to these international standards ensures product safety, performance, and reliability.
Where can I find the datasheet or manual for this circuit breaker?
Official datasheets and comprehensive manuals are available on the Siemens Industry Online Support (SIOS) platform.
You can also obtain this documentation directly from authorized Siemens distributors or sales representatives.
Accurate documentation is vital for correct installation, operation, and maintenance.
