Siemens 3VA1220-4EF32-0AA0 3VA12 Series Molded Case Circuit Breaker 250A 3P 36kA
The Siemens 3VA1220-4EF32-0AA0 3VA12 Series molded case circuit breaker is a robust and reliable solution for industrial power distribution and protection. This 250A, 3-pole breaker boasts a 36kA breaking capacity, ensuring superior safety and operational continuity. Its advanced thermal-
Siemens 3VA1220-4EF32-0AA0: Product Specifications
| Specification | Value |
| :---------------------- | :------------------------------------------ |
| Manufacturer | Siemens |
| Series | 3VA12 Series |
| Product Number | 3VA1220-4EF32-0AA0 |
| Rated Current (In) | 250 A |
| Number of Poles | 3P (3-pole) |
| Breaking Capacity (Icu) | 36 kA |
| Trip Unit Type | Thermal-Magnetic |
| Mounting Type | Fixed |
| Frame Size | 3VA12 |
| Product Type | Molded Case Circuit Breaker (MCCB) |
| Voltage Rating | Up to 690 V AC (refer to specific variants) |
| Ambient Temperature | -25 to +70 °C (typical operating range) |
Core Features & Market Positioning
The Siemens 3VA1220-4EF32-0AA0 stands out in the competitive MCCB market due to its superior breaking capacity of 36kA, offering enhanced safety for fault current mitigation. Its robust thermal-magnetic trip unit provides reliable and adjustable protection against overloads and short circuits, crucial for safeguarding sensitive industrial equipment. The 3VA12 series is recognized for its compact footprint, allowing for space-saving installations in densely populated control panels and switchboards. This focus on safety, reliability, and space efficiency positions the 3VA1220-4EF32-0AA0 as a premium choice for engineers and facility managers prioritizing operational integrity and efficient use of space. Siemens' long-standing reputation for quality further solidifies its market advantage.
Key Application Scenarios
This Siemens 3VA1220-4EF32-0AA0 molded case circuit breaker is ideally suited for main distribution panels, sub-distribution boards, and motor feeder protection within industrial facilities. It is extensively used in manufacturing plants, chemical processing units, and data centers where reliable power distribution and robust fault protection are paramount. Its 36kA breaking capacity makes it suitable for installations with higher prospective fault currents, such as near transformers or in facilities with significant power demands. The 3-pole configuration ensures complete isolation of all phases during fault conditions, a critical requirement for many industrial motor control circuits and power distribution systems.
Practical System Integration Guidance
Integrating the Siemens 3VA1220-4EF32-0AA0 into existing or new electrical systems is straightforward due to its fixed mounting design and standard terminal configurations. Ensure the main power conductors are securely connected to the line-side terminals and the load conductors to the load-side terminals, adhering to torque specifications to prevent loose connections and potential overheating. For thermal-magnetic trip units, adjustments for overload settings are typically made via accessible dials on the front of the breaker, allowing for fine-tuning to match specific load requirements. Proper grounding of the breaker frame and enclosure is essential for safety. Always consult the official Siemens installation manual for detailed wiring diagrams and electrical connection best practices relevant to your specific application and local electrical codes.
Operation and Risk Mitigation
Operating the Siemens 3VA1220-4EF32-0AA0 involves understanding its trip mechanisms. The thermal element provides overload protection by reacting to sustained overcurrents, while the magnetic element offers instantaneous protection against severe short circuits. To reset the breaker after a trip, ensure the fault condition has been cleared, then firmly move the operating handle to the "OFF" position before pushing it to the "ON" position. Regularly inspect terminals for signs of overheating or corrosion and ensure the breaker is free from dust and debris. Performing periodic maintenance and testing, as recommended by Siemens, is crucial for mitigating risks associated with component failure and ensuring its protective function remains effective throughout its service life.
Scalability & Long-Term Value
The Siemens 3VA1220-4EF32-0AA0 offers excellent long-term value through its compatibility with Siemens' broader portfolio of industrial automation and power distribution components. While this specific model is a fixed-type breaker, the 3VA12 series itself offers various accessories and communication modules that can be added for enhanced monitoring and control, supporting integration into digitalized industrial environments (IIoT). This allows for future upgrades to remote operation, fault diagnostics, and energy management systems. Its robust construction and high-quality components ensure a long operational lifespan, minimizing replacement costs and contributing to the overall reliability and efficiency of the electrical infrastructure over time.
FAQs
What is the primary function of the Siemens 3VA1220-4EF32-0AA0?
Its main role is electrical power protection. It safeguards circuits from overloads and short circuits. This prevents equipment damage and ensures safety.
This circuit breaker acts as an automatic switch. It interrupts current flow during fault conditions. This protects downstream components and wiring.
The 3VA1220-4EF32-0AA0 is a molded case circuit breaker (MCCB). It is designed for industrial applications requiring robust protection.
How do I adjust the trip settings on the Siemens 3VA1220-4EF32-0AA0?
Adjustment typically involves the thermal-magnetic trip unit. Settings for overload current are usually accessible. Look for adjustment dials on the breaker's front face.
Consult the product manual for precise instructions. It details the range and method for setting overload current (Iu). Ensure settings match load requirements.
Short-circuit trip settings may be fixed or adjustable depending on the specific variant. Always verify before energizing the circuit.
What is the breaking capacity of the 3VA1220-4EF32-0AA0?
This breaker features a breaking capacity of 36 kA. This indicates its ability to safely interrupt fault currents. It is suitable for medium to high fault level systems.
A higher breaking capacity is crucial for safety. It prevents catastrophic failure during severe short circuits. This protects personnel and property.
The 36kA rating ensures compliance with many industrial standards. It provides a reliable protection level for distribution networks.
Can the Siemens 3VA1220-4EF32-0AA0 be used for motor protection?
Yes, it can be used for motor protection. Its thermal-magnetic trip unit offers overload and short-circuit protection. This is essential for motors.
For precise motor starting characteristics, ensure trip settings are appropriate. Adjustments may be needed for motor inrush currents.
This 3-pole breaker ensures complete phase isolation. This is a standard requirement for many motor control applications.
What are the physical dimensions of this circuit breaker?
Specific dimensions vary slightly by mounting type and accessories. Refer to the datasheet for exact measurements. Generally, the 3VA12 series is designed for compactness.
It's designed to fit standard switchboard panel cutouts. This facilitates easy replacement or integration into existing enclosures.
The frame size is important for panel layout. Ensure adequate clearance for wiring and operation. Always check physical constraints before installation.
What is the difference between 3VA12 and other 3VA series breakers?
The 3VA12 series typically represents a specific frame size. It dictates the maximum current and breaking capacity. Higher frame numbers usually indicate larger capacities.
Different 3VA series breakers offer varying trip units. They can range from basic thermal-magnetic to advanced electronic trip units with communication.
The 3VA1220-4EF32-0AA0 is an example of a mid-range capacity breaker within the broader 3VA family. Choose based on your specific protection needs.
Is the Siemens 3VA1220-4EF32-0AA0 suitable for DC applications?
This particular model is designed for AC applications. Its specifications and ratings are optimized for alternating current systems.
Using AC breakers on DC circuits can be dangerous. DC circuits have different arc quenching requirements. Specialized DC breakers are needed.
Always verify the product's intended application. Using it outside its design parameters voids warranty and safety assurances.
What accessories are available for the 3VA1220-4EF32-0AA0?
Various accessories enhance its functionality. These can include auxiliary and alarm switches for monitoring. Locking devices for safety are also common.
Communication modules can be added for IIoT integration. These allow remote monitoring and control capabilities. Shunt releases are available for remote tripping.
Ensure accessory compatibility with the specific breaker model. Consult Siemens documentation for a complete list.
How do I perform a test on this circuit breaker?
Periodic testing ensures operational readiness. Perform functional tests of the trip mechanisms. Use a specialized circuit breaker test set.
Manually operate the breaker through its ON/OFF cycles. Check for smooth mechanical action. Verify that all connections are secure.
For advanced testing, consult Siemens service guidelines. Professional testing may be required for critical applications.
What does the "3P" designation mean for this breaker?
"3P" signifies that the circuit breaker has three poles. It is designed for three-phase electrical systems. Each pole provides protection for one phase conductor.
This ensures complete isolation of all phases. This is critical for protecting three-phase loads like motors. It prevents unbalanced faults.
A 3-pole breaker interrupts all live conductors simultaneously. This is a safety standard in many industrial environments.
