Siemens 5SY6250-8CC Three Phase High Power Circuit Breaker 2P 50A

The Siemens 5SY6250-8CC is a robust three-phase, high-power circuit breaker designed for demanding industrial applications. This 2-pole, 50A breaker offers exceptional reliability and safety, featuring a breaking capacity of 10kA and adhering to IEC standards for superior performance. Its compact design and user-friendly interface simplify installation and maintenance, making it an ideal choice for protecting critical electrical circuits against overcurrents and short circuits.

Siemens 5SY6250-8CC Product Specifications

| Feature             | Specification                               |

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

| Manufacturer        | Siemens                                     |

| Series              | 5SY6                                        |

| Product Type        | Miniature Circuit Breaker (MCB)             |

| Number of Poles     | 2                                           |

| Rated Current       | 50 A                                        |

| Rated Voltage       | 400 V AC (Phase-to-Phase)                   |

| Tripping Curve      | C                                           |

| Breaking Capacity   | 10 kA (IEC 60898-1)                         |

| Frequency           | 50/60 Hz                                    |

| Insulation Voltage  | 500 V                                       |

| Degree of Protection| IP20 (Terminals), IP40 (Enclosure)          |

| Operating Temperature| -25 °C to +55 °C                            |

| Mounting Type       | DIN Rail (35mm)                             |

| Terminal Type       | Screw terminals                             |

| Certifications      | CE, IEC                                     |

Core Features & Market Positioning

The Siemens 5SY6250-8CC distinguishes itself in the industrial circuit breaker market through its advanced tripping mechanism, which provides precise and rapid disconnection under fault conditions. The Type C tripping curve is optimized for inductive loads, offering a balance between sensitivity to overloads and immunity to nuisance tripping caused by inrush currents. This makes it a superior choice for machinery, motor control centers, and distribution boards where consistent power delivery is paramount. Its high breaking capacity of 10kA ensures robust protection, even in high-fault current environments, positioning it as a reliable component in critical infrastructure and complex industrial setups. Siemens' reputation for quality and durability further enhances the market appeal of this specific model, signaling a long-term investment in electrical safety and system stability.

Key Application Scenarios

This Siemens 5SY6250-8CC circuit breaker is engineered for a broad spectrum of industrial applications where precise and reliable overcurrent protection is essential. It is particularly well-suited for protecting motor circuits, transformers, and lighting systems in manufacturing plants, data centers, and commercial buildings. Its robust construction and Type C tripping characteristic make it an excellent choice for applications involving significant inrush currents, such as directly starting electric motors or managing loads with large capacitor banks. Furthermore, it serves as a crucial component in main distribution panels and sub-distribution boards, ensuring the integrity of electrical networks and safeguarding sensitive downstream equipment from electrical faults.

Practical System Integration Guidance

Integrating the Siemens 5SY6250-8CC into existing electrical systems is a straightforward process, facilitated by its standard DIN rail mounting and accessible screw terminals. For a secure connection, ensure that the incoming and outgoing conductors are properly sized for the 50A rating and stripped to the appropriate length for the screw terminals. Always connect the phase conductors to the breaker's load terminals and the supply to the line terminals. During installation, adhere to all local electrical codes and safety regulations. It is recommended to use insulated tools and ensure the main power supply is de-energized before commencing any work to prevent electrical shock. Proper torque must be applied to the screw terminals to guarantee a solid connection and prevent overheating.

Operation and Risk Mitigation

Operating the Siemens 5SY6250-8CC is designed for simplicity and safety. The breaker features a clear ON/OFF toggle lever, allowing for manual switching and visual confirmation of its status. Under normal operation, the lever remains in the ON position. In the event of an overcurrent or short circuit, the breaker will automatically trip, moving the lever to the OFF position and interrupting the power flow. To reset the breaker after a fault, first identify and rectify the cause of the fault. Then, firmly push the toggle lever to the fully OFF position before resetting it to the ON position. To mitigate risks, regularly inspect the breaker for any signs of damage or wear, and ensure the surrounding area is free from combustible materials. Avoid operating the breaker if it appears damaged or is not functioning correctly.

Scalability & Long-Term Value

The Siemens 5SY6250-8CC offers significant long-term value through its compatibility with the broader Siemens industrial automation ecosystem and its inherent durability. While this specific model is a fixed-rated device, its integration capabilities allow it to be part of larger, scalable power distribution systems. For future expansions or upgrades, Siemens offers a wide range of compatible switchgear, protective devices, and control components that can be seamlessly integrated. This ensures that as an industrial facility's power demands evolve, the electrical infrastructure can be adapted without requiring a complete overhaul of existing protection devices. The robust design and high-quality components used in the 5SY series guarantee a long operational lifespan, minimizing the need for premature replacement and contributing to lower total cost of ownership.

Frequently Asked Questions

What is the tripping curve of the Siemens 5SY6250-8CC?

The Siemens 5SY6250-8CC features a Type C tripping curve. This curve is designed for loads with moderate inrush currents. It allows for higher currents for a short duration before tripping.

This makes it ideal for inductive loads like motors. It helps prevent nuisance tripping during startup. Type C offers a good balance for many industrial applications.

The Type C curve is a common choice for motor protection. It provides reliable operation against overloads and short circuits. It's a standard feature for many 5SY series breakers.

What is the breaking capacity of the Siemens 5SY6250-8CC?

The Siemens 5SY6250-8CC has a breaking capacity of 10 kA. This rating refers to the maximum fault current the breaker can safely interrupt. A higher breaking capacity indicates greater protection in high-fault situations.

This 10 kA rating meets stringent IEC standards for industrial environments. It ensures the breaker can handle short-circuit events without damage. This is crucial for preventing cascading failures in electrical systems.

The 10 kA breaking capacity provides substantial protection for most industrial power distribution applications. It's a key safety feature for safeguarding equipment and personnel. This rating is vital for system design calculations.

Can the Siemens 5SY6250-8CC be used for DC applications?

The Siemens 5SY6250-8CC is primarily designed for AC applications. Its specifications, including rated voltage and breaking capacity, are based on AC system characteristics. Using it in DC circuits may not provide adequate protection.

DC circuits have different arc extinguishing properties than AC. Standard AC breakers might not effectively clear DC faults. This can lead to equipment damage or safety hazards.

Always consult the product datasheet or Siemens support for DC application suitability. Specific DC-rated circuit breakers are available for DC systems. Ensure correct breaker selection for system safety.