Siemens 5SN6263-8CN High Breaking Capacity Protector MCB 2P 63A

The Siemens 5SN6263-8CN, a 2-pole, 63A Miniature Circuit Breaker (MCB) with a high breaking capacity, stands as a robust protective device designed for demanding industrial and commercial electrical installations. This MCB offers superior protection against overcurrents and short circuits, ensuring operational continuity and safety. Key technical specifications include a rated voltage of 230/400V AC, a tripping characteristic of C, and a breaking capacity of 6kA, making it suitable for a wide range of applications. Its compact design and high-performance capabilities position it as a reliable choice for circuit protection in modern electrical systems.

Product Specifications

| Feature                | Specification              |

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

| Product Type           | Miniature Circuit Breaker  |

| Manufacturer           | Siemens                    |

| Series                 | 5SN6                       |

| Poles                  | 2P                         |

| Rated Current (In)     | 63A                        |

| Rated Voltage (Ue)     | 230/400V AC                |

| Tripping Characteristic | C                          |

| Breaking Capacity (Icn)| 6kA                        |

| Frequency              | 50/60 Hz                   |

| Protection Class       | IP20 (device), IP40 (enclosure) |

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

| Terminal Type          | Screw Terminal             |

| Mounting               | DIN Rail                   |

Core Features & Market Positioning

The Siemens 5SN6263-8CN distinguishes itself through its high breaking capacity of 6kA, a critical parameter for safeguarding electrical circuits in environments prone to significant fault currents. This capability surpasses many standard MCBs, offering enhanced protection for sensitive equipment and personnel. Its Type C tripping characteristic provides a balance, allowing for temporary inrush currents common in motor starts and lighting circuits without nuisance tripping, while still offering rapid response to short circuits. This makes the 5SN6263-8CN a preferred component for industrial control panels, distribution boards, and machine tool applications where reliable and robust overcurrent protection is paramount. Siemens' reputation for quality and reliability further solidifies the market position of this MCB as a trusted solution for critical infrastructure.

Key Application Scenarios

This high breaking capacity MCB is ideally suited for protecting main distribution circuits and branch circuits in commercial buildings, industrial plants, and manufacturing facilities. Its 63A rating and 6kA breaking capacity are particularly effective in protecting circuits feeding heavy machinery, large motor loads, and high-power lighting systems where significant fault currents can occur. Furthermore, the Siemens 5SN6263-8CN is a suitable choice for safeguarding power supplies in data centers and telecommunications infrastructure, where operational continuity and protection against electrical disturbances are non-negotiable. Its application extends to panel builders and system integrators requiring a dependable circuit breaker that meets stringent safety standards and offers predictable performance under fault conditions.

Practical System Integration Guidance

Integrating the Siemens 5SN6263-8CN into existing or new electrical systems is straightforward due to its standard DIN rail mounting and screw terminal connections. For installation, ensure the main power supply is de-energized. The incoming phase and neutral conductors should be connected to the top terminals (line side), and the outgoing protected conductors to the bottom terminals (load side). Securely tighten the terminal screws to ensure a reliable connection, preventing thermal issues and ensuring optimal current transfer. Proper conductor sizing must be adhered to, matching the 63A rating of the MCB. For systems requiring enhanced safety, consider integrating this MCB within an appropriately rated enclosure to achieve IP40 protection. Always follow local electrical codes and standards during installation.

Operation and Risk Mitigation

The Siemens 5SN6263-8CN operates automatically to interrupt the circuit when an overcurrent or short circuit condition is detected, thereby preventing damage to connected equipment and mitigating fire hazards. The visible status indicator on the breaker clearly shows whether it is in the ON, OFF, or TRIPPED state. In the event of a trip, identify the cause of the overcurrent (e.g., overload, short circuit, or equipment malfunction) before resetting the breaker. To reset, firmly move the operating lever to the ON position. If the breaker trips repeatedly, it indicates an persistent issue that requires professional diagnosis and repair. Never attempt to bypass the tripping mechanism or use a higher-rated breaker than specified for the circuit, as this severely compromises safety and can lead to catastrophic failure.

Scalability & Long-Term Value

The Siemens 5SN6263-8CN is designed for robust performance and long operational life, contributing to the long-term value of electrical installations. While it is a fixed-rating device, its compatibility with the broader Siemens industrial control and distribution product ecosystem allows for seamless integration into larger automation solutions. This ensures that as systems evolve or expand, the protective devices can be harmonized. For future upgrades or higher capacity needs, Siemens offers a comprehensive range of MCBs and other protective devices that maintain consistent quality and interoperability. Investing in Siemens components like the 5SN6263-8CN provides a foundation of reliability and compliance, reducing the likelihood of premature component failure and minimizing costly downtime.

Frequently Asked Questions

What is the primary function of the Siemens 5SN6263-8CN?

The Siemens 5SN6263-8CN is an MCB designed for circuit protection. It safeguards electrical systems from overloads and short circuits by automatically interrupting current flow when fault conditions are detected. This prevents equipment damage and reduces fire risks in industrial and commercial settings.

This device provides essential safety features for any electrical installation. Its high breaking capacity ensures reliable operation even under severe fault scenarios. Understanding its core protective role is crucial for proper system design and maintenance.

The primary aim is to maintain operational integrity and ensure the safety of personnel and property. It acts as an automatic guardian for your electrical circuits.

What does "High Breaking Capacity" mean for the 5SN6263-8CN?

"High Breaking Capacity" (HBC) on the Siemens 5SN6263-8CN, specifically 6kA, indicates its ability to safely interrupt a high level of fault current without sustaining damage. This is critical in industrial environments where fault currents can be substantial.

A higher breaking capacity ensures the MCB can effectively contain and dissipate the energy released during a short circuit. This prevents cascading failures and protects downstream equipment.

Choosing an MCB with adequate breaking capacity prevents catastrophic failure of the device itself during a fault. It's a key safety and reliability specification.

How do I correctly install the Siemens 5SN6263-8CN?

Install the Siemens 5SN6263-8CN by first ensuring the power is completely off to prevent electrical shock. Mount the MCB securely onto a standard 35mm DIN rail in your distribution panel.

Connect the incoming line conductors to the top terminals and the outgoing load conductors to the bottom terminals. Ensure the wire size is appropriate for the 63A rating and that all connections are tightly secured.

Always adhere to local electrical codes and safety regulations during installation. If you are unsure, consult a qualified electrician to ensure correct and safe installation.