Siemens 5SN6463-7CN Miniature Circuit Breaker (MCB) 4P 63A

The Siemens 5SN6463-7CN Miniature Circuit Breaker (MCB) is a robust, four-pole, 63-ampere protection device engineered for superior circuit integrity in demanding industrial environments. This MCB distinguishes itself through its high breaking capacity, reliable tripping characteristics, and advanced thermal overload and short-circuit protection, ensuring operational continuity and safeguarding critical electrical infrastructure. With a rated voltage of 400V AC and a frequency of 50/60 Hz, the 5SN6463-7CN is designed for universal application, offering peace of mind through its adherence to stringent international safety standards.

| Specification                     | Value                       |

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

| Product Type                      | Miniature Circuit Breaker   |

| Manufacturer                      | Siemens                     |

| Model Number                      | 5SN6463-7CN                 |

| Number of Poles                   | 4                           |

| Rated Current (In)                | 63 A                        |

| Rated Voltage (Ue)                | 400V AC                     |

| Frequency                         | 50/60 Hz                    |

| Breaking Capacity (Icn)           | 6 kA                        |

| Tripping Characteristic           | C                           |

| Protection                        | Thermal overload, short-circuit |

| Mounting Type                     | DIN Rail                    |

| Terminal Type                     | Screw Terminal              |

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

| Degree of Protection              | IP20                        |

| Compliance                        | IEC/EN 60898-1              |

Core Features & Market Positioning

The Siemens 5SN6463-7CN MCB stands out in the competitive industrial electrical market due to its exceptional reliability and advanced protection capabilities. Its "C" tripping characteristic makes it ideal for circuits with moderate inrush currents, such as those found in motor applications and fluorescent lighting systems, providing a balance between sensitivity to faults and immunity to nuisance tripping. The robust construction and high breaking capacity of 6 kA ensure that it can safely interrupt fault currents, preventing damage to downstream equipment and minimizing downtime. Siemens' reputation for quality and innovation underpins the 5SN6463-7CN's positioning as a trusted component for critical infrastructure protection, offering long-term value and operational security.

Key Application Scenarios

This four-pole, 63A MCB is extensively deployed across various industrial sectors requiring dependable power distribution and protection. Its versatility makes it a prime choice for main distribution boards, sub-distribution panels, and critical machinery control circuits within manufacturing plants, data centers, and commercial buildings. Specific applications include safeguarding large motor loads, protecting sensitive electronic equipment from overcurrents and short circuits, and ensuring the stable operation of HVAC systems. The 5SN6463-7CN is particularly well-suited for environments where consistent power availability and robust fault interruption are paramount.

Practical System Integration Guidance

Integrating the Siemens 5SN6463-7CN MCB into existing or new electrical systems is straightforward due to its standard DIN rail mounting design and convenient screw terminals. Proper wiring involves connecting the incoming power supply to the line terminals and the outgoing load circuits to the respective load terminals on each of the four poles. Ensure that the incoming conductors are adequately sized for the 63A rating and that all connections are securely tightened to prevent overheating and ensure optimal electrical contact. For systems requiring auxiliary contacts for remote signaling of trip status, ensure compatibility with Siemens' range of signal modules, which can be easily snapped onto the side of the MCB.

Operation and Risk Mitigation

The Siemens 5SN6463-7CN MCB operates by automatically disconnecting the circuit when it detects either a sustained overload current or a sudden, high-magnitude short-circuit current. The thermal element responds to gradual overloads, while the magnetic element reacts instantaneously to short circuits. To mitigate risks, regular visual inspections for damage or signs of overheating are recommended. In the event of a trip, identify and rectify the cause of the fault before resetting the MCB by simply lifting the lever to the 'ON' position. Avoid manually forcing the lever if the breaker does not reset, as this indicates an persistent fault condition that requires professional diagnosis.

Scalability & Long-Term Value

The Siemens 5SN6463-7CN MCB offers significant long-term value through its compatibility with the broader Siemens industrial automation ecosystem. Its modular design allows for easy integration into larger distribution systems and facilitates future expansion or upgrades without compromising existing infrastructure. While not inherently an IIoT device, its reliable performance and clear status indication are foundational for smart grid applications and can be integrated with monitoring systems via auxiliary contacts. This ensures that the 5SN6463-7CN contributes to operational efficiency and provides a scalable protection solution for evolving industrial demands.

Frequently Asked Questions

What is the breaking capacity of the Siemens 5SN6463-7CN MCB?

This MCB features a breaking capacity of 6 kA. This ensures it can safely interrupt fault currents.

This high rating is crucial for industrial applications. It protects against severe short-circuit events.

A 6 kA capacity is standard for many distribution boards. It offers robust protection for various loads.

What type of loads is the Siemens 5SN6463-7CN MCB suitable for?

It is ideal for circuits with moderate inrush currents. This includes motors and lighting.

The 'C' curve tripping characteristic ensures it handles these loads. It prevents nuisance tripping from temporary surges.

Applications range from general power distribution to specific machinery protection. It provides reliable circuit safety.

How do I install the Siemens 5SN6463-7CN MCB?

Mount it on a standard 35mm DIN rail. Ensure secure connection of incoming and outgoing wires.

Use appropriate torque for screw terminals. This guarantees reliable electrical contact and prevents heat buildup.

Follow local electrical codes and regulations. Professional installation is always recommended for safety.

What does the 'C' curve signify on this MCB?

The 'C' curve indicates its tripping range for overcurrents. It's designed for inductive loads.

It allows for higher inrush currents than a 'B' curve. This prevents premature tripping of motors.

This characteristic balances fault protection with immunity to temporary surges. It is common in industrial settings.

Can I use this MCB for DC applications?

The Siemens 5SN6463-7CN is designed for AC circuits. It is rated for 400V AC.

Using it on DC circuits is not recommended. DC characteristics differ significantly from AC.

Consult Siemens for specific DC-rated circuit breakers. Using the wrong breaker poses a safety risk.

What is the rated current and voltage of this MCB?

This MCB has a rated current of 63 Amperes. Its rated voltage is 400 Volts AC.

These ratings determine the maximum load it can safely handle. Ensure they match your circuit's requirements.

Exceeding these limits can lead to overheating and failure. Always adhere to the specified parameters.

How do I reset the Siemens 5SN6463-7CN after a trip?

First, identify and resolve the fault causing the trip. Then, simply flip the lever to the 'ON' position.

If it trips again immediately, there is still a fault. Do not force the lever.

Persistent tripping requires professional diagnosis. Investigate the circuit for underlying issues.

What are the dimensions and mounting requirements?

It mounts on a standard 35mm DIN rail. Ensure adequate clearance for ventilation.

The MCB has a specific width per pole. Check its physical dimensions for panel space planning.

Its compact design facilitates integration into various enclosures. Ensure proper termination access.

Is this MCB compatible with Siemens automation systems?

Its modular design allows integration. It can be part of larger distribution systems.

Auxiliary contacts can interface with control systems. This enables remote monitoring and signaling.

While not IIoT native, it forms a reliable base for integration. It supports smart grid readiness.

What safety standards does the Siemens 5SN6463-7CN comply with?

It complies with IEC/EN 60898-1 standards. These are international safety benchmarks.

Adherence to these standards ensures safety and performance. It guarantees reliable protection.

This compliance is critical for industrial installations. It confirms the product's quality and dependability.