Siemens 5SN6250-7CN Miniature Circuit Breaker (MCB) 2P 50A

The Siemens 5SN6250-7CN Miniature Circuit Breaker (MCB) 2P 50A stands as a robust and reliable solution for overcurrent protection in a multitude of industrial and commercial electrical systems. Engineered for superior performance, this 2-pole, 50 Amp MCB offers exceptional breaking capacity and enhanced safety features, making it a cornerstone for safeguarding sensitive equipment and personnel. Its design prioritizes efficient operation, rapid fault interruption, and seamless integration into existing power distribution networks.

Product Specifications

| Feature                  | Specification                        |

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

| Product Type             | Miniature Circuit Breaker (MCB)      |

| Manufacturer             | Siemens                               |

| Model Number             | 5SN6250-7CN                          |

| Number of Poles          | 2 (Double Pole)                      |

| Rated Current (In)       | 50 A                                 |

| Rated Voltage (Un)       | 400/415 VAC                          |

| Breaking Capacity (Icn)  | 6 kA                                 |

| Trip Curve               | C Curve                              |

| Frequency                | 50/60 Hz                             |

| Insulation Voltage (Ui)  | 500 V                                |

| Degree of Protection     | IP20                                 |

| Mounting Type            | DIN Rail Mount                       |

| Operating Temperature    | -25°C to +45°C                       |

| Standards Compliance     | IEC/EN 60898-1, IEC/EN 60947-2     |

Core Features & Market Positioning

The Siemens 5SN6250-7CN MCB distinguishes itself through its high breaking capacity of 6 kA, ensuring it can safely interrupt fault currents that might overwhelm lesser devices. Its Type C tripping characteristic makes it ideal for circuits with moderate inrush currents, such as those found with fluorescent lighting or small motor loads, providing sensitive protection without nuisance tripping. This MCB leverages Siemens' renowned quality and manufacturing precision, positioning it as a dependable choice for professionals seeking long-term operational security and compliance with stringent international standards like IEC/EN 60898-1 and IEC/EN 60947-2.

Key Application Scenarios

This 2-pole, 50A MCB is exceptionally well-suited for protecting main distribution circuits, sub-distribution boards, and individual load circuits in commercial buildings, industrial facilities, and residential complexes. Common applications include safeguarding lighting circuits, socket outlets, small machinery, and HVAC equipment where a C-curve protection is specified. Its double-pole design ensures simultaneous disconnection of both live and neutral conductors, offering enhanced safety for equipment and personnel, particularly in systems requiring complete isolation.

Practical System Integration Guidance

Integrating the Siemens 5SN6250-7CN MCB into electrical panels is straightforward due to its standard DIN rail mounting compatibility. For installation, ensure the main power supply is de-energized. Connect the line conductor to terminal L and the neutral conductor to terminal N on one side of the MCB, and the outgoing protected circuit's line and neutral conductors to the corresponding output terminals. Ensure all connections are tight to prevent overheating. Proper wiring according to local electrical codes and standards is paramount for safe and effective operation.

Operation and Risk Mitigation

The 5SN6250-7CN operates by automatically interrupting the circuit when an overcurrent (either overload or short circuit) is detected, indicated by the tripping of the toggle lever to the OFF position. To reset, first identify and rectify the cause of the fault. Then, push the toggle lever fully up to the ON position. If the MCB trips repeatedly, a persistent fault condition exists that requires professional diagnosis. Avoid forcing the lever or attempting to reset a faulty breaker, as this can lead to severe electrical hazards, including fire or electric shock.

Scalability & Long-Term Value

Siemens MCBs, including the 5SN6250-7CN, are designed with backward and forward compatibility in mind within the Siemens product ecosystem. This ensures that upgrades or expansions to electrical distribution systems can be made with confidence, as new Siemens protective devices will seamlessly integrate with existing infrastructure. While this specific model focuses on core overcurrent protection, its reliability and adherence to global standards contribute to the long-term value and reduced maintenance costs of the protected electrical installation.

FAQs

What is the breaking capacity of the Siemens 5SN6250-7CN MCB?

The Siemens 5SN6250-7CN MCB features a robust breaking capacity of 6 kA. This specification is critical for safely interrupting short-circuit currents. It ensures that fault energy is managed effectively, preventing damage to the electrical system and potential hazards.

How is the Siemens 5SN6250-7CN MCB installed?

Installation involves mounting the MCB onto a standard 35mm DIN rail within an electrical enclosure. Ensure the power supply is completely isolated before wiring. Connect the incoming line and neutral conductors to the designated input terminals. Then, connect the outgoing circuit conductors to the corresponding output terminals. Always adhere to local electrical codes and safety regulations during installation.

What does the 'C' in the trip curve designation mean for this MCB?

The 'C' curve indicates that the Siemens 5SN6250-7CN MCB is designed to trip when the current reaches 5 to 10 times the rated current (50A). This characteristic is suitable for circuits with moderate inrush currents, such as those powering small motors or fluorescent lighting. It helps prevent nuisance tripping while still providing protection against short circuits.