Siemens 5SN6463-8CN High Breaking Capacity MCB 4P 63A

The Siemens 5SN6463-8CN is a 4-pole, 63A Miniature Circuit Breaker (MCB) engineered for robust protection in demanding industrial environments. This high breaking capacity device offers superior fault current interruption, ensuring operational continuity and personnel safety. Key advantages include its advanced tripping mechanisms for reliable overload and short-circuit protection, compact design for space efficiency, and high endurance, making it a cornerstone for critical power distribution.

Product Specifications

| Feature                 | Specification                                       |

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

| Manufacturer            | Siemens                                             |

| Product Series          | 5SN6                                                |

| Model Number            | 5SN6463-8CN                                         |

| Number of Poles         | 4                                                   |

| Rated Current (In)      | 63A                                                 |

| Breaking Capacity (Icn) | 15 kA                                               |

| Voltage Rating (Un)     | 400/415V AC                                         |

| Tripping Characteristic | C Curve                                             |

| Frequency               | 50/60 Hz                                            |

| Insulation Voltage (Ui) | 500V AC                                             |

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

| Terminal Type           | Tunnel Terminal                                     |

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

| Mounting                | DIN Rail (35mm)                                     |

| Certifications          | CE, IEC                                             |

Core Features & Market Positioning

The Siemens 5SN6463-8CN MCB stands out with its substantial 15 kA breaking capacity, a critical parameter for safeguarding electrical installations against severe short-circuit events. This makes it ideal for main distribution boards and areas prone to high fault levels, offering a significant competitive edge over lower-rated breakers. The C-curve tripping characteristic is precisely tuned for industrial applications, effectively balancing protection against motor inrush currents while ensuring sensitive detection of overloads. Siemens' established reputation for reliability and robust engineering further solidifies the market position of the 5SN6463-8CN as a trusted component in critical infrastructure.

Key Application Scenarios

This Siemens MCB is exceptionally suited for protecting main power feeds in industrial facilities, control panels, and machinery where high fault currents are anticipated. Its 4-pole configuration ensures comprehensive protection for three-phase systems, including neutral conductors, which is vital in many industrial motor control circuits and power distribution networks. Applications in manufacturing plants, data centers, and commercial buildings with significant electrical loads will benefit from its reliable performance and high breaking capacity.

Practical System Integration Guidance

Installation of the Siemens 5SN6463-8CN is facilitated by its standard 35mm DIN rail mounting, allowing for quick and secure integration into existing or new electrical enclosures. The tunnel terminals are designed for robust cable connections, accommodating appropriately sized conductors for the 63A rating to ensure safety and optimal conductivity. Proper torque application during termination is crucial to prevent overheating and ensure long-term operational integrity. Ensure that the ambient temperature of the installation site remains within the specified operating range of -25°C to +55°C for optimal performance and lifespan.

Operation and Risk Mitigation

The 5SN6463-8CN operates by detecting overcurrents due to overloads or short circuits and rapidly interrupting the power supply to prevent damage to equipment and minimize fire hazards. Its thermal tripping mechanism responds to sustained overloads, while the magnetic tripping mechanism provides instantaneous interruption for severe short circuits. Users should be aware that improper wiring or exceeding the breaking capacity can lead to failure of the MCB. Regular visual inspection of terminals for signs of overheating or damage is recommended as a preventative measure.

Scalability & Long-Term Value

As part of Siemens' comprehensive electrical distribution portfolio, the 5SN6463-8CN offers excellent compatibility with other Siemens components, facilitating seamless integration into larger systems. While MCBs themselves are protective devices and not directly "upgradable" in the traditional sense, their robust design and adherence to international standards ensure a long operational lifespan. Their reliability reduces the need for premature replacement, contributing to long-term cost savings. For future expansions or integration into digital monitoring systems, Siemens offers a range of compatible accessories and intelligent devices that can be incorporated alongside these MCBs.

FAQs

What is the breaking capacity of the Siemens 5SN6463-8CN?

The Siemens 5SN6463-8CN MCB boasts a significant breaking capacity of 15 kA. This high rating is essential for safely interrupting potentially destructive short-circuit currents. It ensures the device can safely clear faults without failing.

This specification makes it suitable for demanding industrial environments where fault levels can be substantial. It provides robust protection for critical power distribution systems.

Therefore, the 15 kA rating is a key differentiator, offering enhanced safety and reliability compared to lower-capacity circuit breakers.

What type of tripping characteristic does the 5SN6463-8CN have?

The Siemens 5SN6463-8CN features a C-curve tripping characteristic. This curve is specifically designed for industrial applications.

It provides a balance between protecting against overloads and allowing for temporary current surges, such as motor inrush currents. This prevents nuisance tripping in normal operating conditions.

Consequently, the C-curve ensures reliable protection for equipment like motors, transformers, and high-power lighting circuits commonly found in industrial settings.

What are the main applications for a 4-pole, 63A MCB like the 5SN6463-8CN?

This 4-pole, 63A MCB is ideal for main power distribution in industrial facilities. Its robust design handles high fault currents effectively.

It is commonly used in control panels, machinery protection, and electrical distribution boards within manufacturing plants. The four poles ensure complete protection for three-phase systems, including the neutral conductor.

Applications also extend to commercial buildings and data centers requiring reliable protection for significant electrical loads and critical infrastructure.

How is the Siemens 5SN6463-8CN installed?

Installation is straightforward, utilizing a standard 35mm DIN rail mounting system. This allows for quick and secure placement within electrical enclosures.

The device features robust tunnel terminals designed for secure and reliable termination of appropriately sized electrical conductors. Proper torque application is crucial during wiring.

Ensure the installation environment adheres to the product's IP rating and temperature specifications for optimal performance and longevity.

What kind of protection does the Siemens 5SN6463-8CN provide?

It provides comprehensive overcurrent protection against both overloads and short circuits. The MCB uses thermal tripping for overloads and magnetic tripping for short circuits.

This dual mechanism ensures rapid and safe interruption of electrical circuits when abnormal current conditions are detected. It safeguards equipment and prevents hazards.

This protection is vital for maintaining operational continuity and preventing damage to sensitive industrial machinery and electrical infrastructure.

Is the Siemens 5SN6463-8CN suitable for residential use?

While technically capable of providing protection, this MCB is primarily engineered for industrial applications. Its high breaking capacity (15kA) and C-curve are typically designed for higher fault currents found in industrial settings.

Residential applications usually employ MCBs with lower breaking capacities and different tripping curves (like B or C) suited for domestic load characteristics. Using an industrial-grade MCB residentially is often unnecessary and may not align with standard residential electrical codes.

For specific residential needs, it's always recommended to consult with a qualified electrician who can specify the appropriate and code-compliant circuit protection devices.

What is the significance of the "4P" designation for this MCB?

The "4P" designation signifies that the Siemens 5SN6463-8CN is a 4-pole circuit breaker. In three-phase electrical systems, this means it can simultaneously switch and protect all three live conductors (L1, L2, L3) and the neutral conductor (N).

This complete switching and protection of all conductors, including the neutral, is crucial in many industrial applications, especially for equipment that requires complete isolation or where neutral currents need to be monitored or switched. It ensures a more robust and comprehensive level of safety for three-phase installations.

Therefore, the 4-pole design is vital for applications involving motors, certain types of electronic equipment, and distribution systems where breaking all conductors is a safety requirement or standard practice.

Can the Siemens 5SN6463-8CN be used in DC circuits?

The Siemens 5SN6463-8CN is designed and rated for AC (Alternating Current) circuits only. Its specifications, including voltage rating (400/415V AC) and tripping characteristics, are optimized for AC power systems.

Using an AC-rated MCB in DC (Direct Current) circuits can be extremely hazardous and ineffective. DC circuits have different arc-quenching requirements, and AC MCBs may not be able to safely interrupt a DC fault current, leading to dangerous arcing and equipment failure.

For DC applications, specific DC circuit breakers with appropriate DC voltage ratings and arc suppression capabilities must be used to ensure safety and proper operation.

What are the dimensions of the Siemens 5SN6463-8CN?

The Siemens 5SN6463-8CN MCB adheres to standard modular dimensions for DIN rail mounting. It occupies a width of 70mm (four modules, as each module is typically 17.5mm) and has a standard depth and height compatible with most distribution boards and enclosures.

Specifically, its dimensions are approximately 70mm in width, 83mm in height, and 74mm in depth. This standardized sizing ensures easy integration and replacement within existing electrical panel layouts designed for IEC/EN standards.

These compact, modular dimensions allow for high-density installations in control cabinets and switchboards, maximizing space utilization while maintaining accessibility for wiring and maintenance.

Where can I find the manual for the Siemens 5SN6463-8CN?

The official operating and installation manual for the Siemens 5SN6463-8CN can typically be found on the Siemens Industry Online Support (SIOS) portal. You would usually search for the product's specific order number (5SN6463-8CN) or its article number to locate the relevant documentation.

The manual provides detailed information on installation, connection, operation, safety precautions, and troubleshooting specific to this MCB model. It is an essential resource for ensuring safe and correct application of the product.

Alternatively, authorized Siemens distributors or technical support channels can often provide direct links or assistance in obtaining the correct documentation for this industrial component.