Siemens 3VA1220-6MH32-0AA0 3VA12 Series Molded Case Circuit Breaker 200A 250A 3P 85kA
The Siemens 3VA1220-6MH32-0AA0, a robust 3-pole molded case circuit breaker from the 3VA12 series, offers superior protection for industrial electrical systems, boasting a 200A to 250A continuous current rating and a significant 85kA interrupting capacity at 480V. This breaker is engineered for reliability, featuring advanced thermal-magnetic trip units for precise overcurrent detection and phase loss sensitivity for enhanced safety. Its compact design and flexible mounting options facilitate seamless integration into various switchboard configurations. The 3VA12 series is designed to meet stringent international standards, ensuring compliance and dependable performance in demanding environments.
Product Specifications
| Feature | Specification |
| :---------------------------- | :--------------------------------------------- |
| Product Type | Molded Case Circuit Breaker (MCCB) |
| Series | 3VA12 |
| Model Number | 3VA1220-6MH32-0AA0 |
| Number of Poles | 3 |
| Rated Current (In) | 200A - 250A (Adjustable) |
| Rated Ultimate Breaking Capacity (Icu) | 85kA at 480V |
| Trip Unit Type | Thermal-Magnetic |
| Voltage Rating (AC) | Up to 600V AC |
| Frequency | 50/60 Hz |
| Mounting Type | Fixed, Front or Rear Connection |
| Terminal Type | Box Lugs |
| Protection Features | Overload, Short Circuit, Phase Loss Sensitivity |
| Certifications | UL, IEC, CSA |
| Ambient Temperature Operating | -25°C to 70°C |
Core Features & Market Positioning
The Siemens 3VA1220-6MH32-0AA0 stands out in the competitive MCCB market due to its exceptional interrupting capacity, providing a high level of safety against severe short-circuit events. Its adjustable thermal-magnetic trip unit offers versatility, allowing engineers to fine-tune overcurrent protection settings to match specific load requirements and reduce nuisance tripping, thereby optimizing operational continuity. The inclusion of phase loss sensitivity is a critical differentiator, offering enhanced protection for sensitive motor loads against unbalanced voltage conditions. Positioned as a premium solution for critical power distribution, the 3VA12 series emphasizes reliability, durability, and compliance with global standards, making it a preferred choice for demanding industrial applications.
Key Application Scenarios
This Siemens circuit breaker is ideally suited for main and branch circuit protection in industrial facilities, manufacturing plants, and commercial buildings. Its high interrupting rating makes it essential for switchgear and control panels where significant fault currents are anticipated, such as in motor control centers (MCCs) and power distribution boards. The 3VA1220-6MH32-0AA0 is frequently deployed to safeguard large industrial motors, transformers, and sensitive electronic equipment from damaging overloads and short circuits, ensuring uninterrupted production processes. Its versatility in current adjustment also makes it suitable for applications with varying load profiles.
Practical System Integration Guidance
Integrating the Siemens 3VA1220-6MH32-0AA0 into existing electrical systems is straightforward due to its fixed mounting design and standard terminal configurations. Ensure that the ambient temperature around the breaker remains within the specified operating range of -25°C to 70°C for optimal performance and longevity. When connecting, proper torque must be applied to the box lug terminals to ensure a secure and low-resistance electrical connection, preventing overheating. For systems requiring remote monitoring or advanced control, auxiliary contacts and trip alarm switches can be fitted, enabling integration with SCADA systems or building management platforms.
Operation and Risk Mitigation
The primary function of the Siemens 3VA1220-6MH32-0AA0 is to interrupt current flow during fault conditions, protecting downstream equipment and personnel from electrical hazards. The thermal element provides long-time delay protection against overloads, while the magnetic element offers instantaneous protection against severe short circuits. Phase loss sensitivity is a key safety feature that automatically trips the breaker if one phase loses voltage, preventing motor damage. Regular inspection and testing of the circuit breaker, including trip testing, are crucial for maintaining its operational integrity and ensuring it will function correctly during a fault event. Adherence to lockout/tagout procedures during maintenance is paramount to prevent accidental re-energization.
Scalability & Long-Term Value
The 3VA12 series, including the 3VA1220-6MH32-0AA0, offers a degree of scalability through its adjustable trip settings and compatibility with a range of accessories. While it is a fixed-
Frequently Asked Questions (FAQs)
Q1: What is the Siemens 3VA1220-6MH32-0AA0 rated for?
This breaker is rated for 200A to 250A continuous current.
It offers an 85kA interrupting capacity at 480V.
It is a 3-pole molded case circuit breaker.
Q2: What protection features does this breaker have?
It provides overload protection via a thermal element.
It offers short-circuit protection with a magnetic element.
Phase loss sensitivity is included for motor protection.
Q3: Can I adjust the current settings on this breaker?
Yes, the thermal-magnetic trip unit is adjustable.
You can set the continuous current rating between 200A and 250A.
This allows for customization to specific load requirements.
Q4: What are the typical applications for the 3VA1220-6MH32-0AA0?
It's used in main and branch circuit protection.
Commonly found in industrial power distribution panels.
Ideal for safeguarding motors, transformers, and sensitive loads.
Q5: What is the interrupting capacity of this Siemens breaker?
The breaker has an interrupting capacity of 85kA.
This rating is specified at 480V AC.
It ensures safety during severe short-circuit events.
Q6: What are the mounting and connection options?
This is a fixed-mount circuit breaker.
It supports front or rear connection terminals.
Box lugs are typically used for load connections.
Q7: Does this breaker support communication or digital integration?
Basic models may not have integrated communication.
However, auxiliary and alarm switches can be fitted.
Siemens offers optional communication modules for some 3VA series breakers.
Q8: What is the voltage rating for the 3VA1220-6MH32-0AA0?
The breaker is rated for up to 600V AC.
It operates on standard 50Hz or 60Hz power systems.
Always verify the exact voltage requirements for your application.
Q9: How does phase loss sensitivity protect equipment?
It detects a loss of voltage in one phase.
This prevents damage to motors running on unbalanced power.
The breaker will trip if a phase loss is detected.
Q10: What are the environmental operating limits for this breaker?
It can operate in ambient temperatures from -25°C to 70°C.
Proper ventilation is crucial for maintaining performance.
Avoid exposing the breaker to extreme humidity or corrosive atmospheres.
