Siemens 5SN6350-8CN High Breaking Capacity MCB for Heavy Loads 3P 50A

The Siemens 5SN6350-8CN is a robust 3-pole, 50A Miniature Circuit Breaker (MCB) engineered for high-breaking capacity applications, making it an indispensable component for safeguarding heavy-duty electrical loads. This MCB excels in environments demanding superior fault current protection, ensuring operational continuity and equipment integrity. Its advanced design prioritizes reliability and safety, offering peace of mind for critical industrial installations.

Product Specifications

| Feature                     | Specification             |

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

| Product Type                | Miniature Circuit Breaker |

| Model Number                | 5SN6350-8CN               |

| Poles                       | 3                         |

| Rated Current (In)          | 50A                       |

| Breaking Capacity (Icn)     | 6 kA                      |

| Voltage Rating (Ue)         | 400V AC                   |

| Frequency                   | 50/60 Hz                  |

| Tripping Characteristic     | Type C                    |

| Insulation Voltage (Ui)     | 500V AC                   |

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

| Electrical Endurance        | 10,000 cycles             |

| Mechanical Endurance        | 20,000 cycles             |

| Protection Class            | IP20 (enclosure)          |

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

Core Features & Market Positioning

The Siemens 5SN6350-8CN distinguishes itself through its high breaking capacity of 6 kA, a critical parameter for industrial settings where short-circuit currents can be substantial. This robust performance ensures that the MCB can safely interrupt fault currents, preventing cascading failures and protecting sensitive downstream equipment. Its Type C tripping characteristic offers a balance between protection against overloads and tolerance for short, high inrush currents typically associated with motors and transformers, a feature highly valued in heavy industrial applications. This combination positions the 5SN6350-8CN as a reliable and versatile solution for demanding electrical protection needs, offering a competitive edge over lower-capacity breakers.

Key Application Scenarios

This 3-pole, 50A Siemens MCB is ideally suited for protecting main distribution circuits and individual circuits in industrial facilities, commercial buildings, and heavy-duty machinery. Its high breaking capacity makes it particularly effective for safeguarding motor control centers, large machinery power feeds, and any application where significant fault currents are anticipated. Common use cases include protecting pumps, compressors, large fans, and HVAC systems. The 5SN6350-8CN is also a robust choice for power distribution panels in manufacturing plants and workshops.

Practical System Integration Guidance

Integrating the Siemens 5SN6350-8CN into existing or new electrical systems is straightforward due to its standard DIN rail mounting compatibility and clearly marked terminals. For a 3-pole configuration, ensure all three incoming live conductors are connected to the load-side terminals, and the corresponding outgoing conductors for the protected circuits are connected to the line-side terminals. Correct wiring is paramount; use conductors of appropriate gauge to handle the 50A rated current and comply with local electrical codes and standards. Before energizing, verify all connections are secure and that the breaker is in the OFF position to prevent immediate tripping.

Operation and Risk Mitigation

Operating the Siemens 5SN6350-8CN involves simply toggling the front-facing lever to the ON or OFF position. The primary function is automatic tripping when an overcurrent or short circuit condition exceeds its rated parameters, indicated by the lever moving to the tripped position. To reset, ensure the fault has been cleared, then push the lever fully to the OFF position before returning it to ON. Common troubleshooting involves identifying the cause of tripping, which could be an overload (gradual increase in current) or a short circuit (sudden, massive current). Avoid resetting the breaker repeatedly without investigating the root cause, as this could indicate a persistent fault and potential equipment damage or fire hazard.

Scalability & Long-Term Value

The Siemens 5SN6350-8CN offers significant long-term value through its robust construction and compatibility with Siemens' broader industrial electrical product ecosystem. While this specific MCB is designed for a fixed 50A rating, scalability in a system is achieved by installing additional 5SN6350-8CN units or higher-rated Siemens circuit breakers in upstream or downstream panels as load requirements evolve. Its adherence to international standards ensures compatibility with a wide range of switchgear and control components, facilitating integration into existing and future upgrades of electrical distribution systems.

Frequently Asked Questions

What is the breaking capacity of the Siemens 5SN6350-8CN MCB?

The Siemens 5SN6350-8CN boasts a breaking capacity of 6 kA.

This specification is crucial for safely interrupting fault currents. It ensures protection against severe short circuits.

What type of loads is the 5SN6350-8CN MCB suitable for?

This MCB is designed for heavy industrial loads.

Its high breaking capacity is ideal for motors and transformers. It also protects main distribution circuits.

What does the "3P" designation signify for the Siemens 5SN6350-8CN?

"3P" indicates the MCB has three poles.

This means it can simultaneously protect and switch three separate live conductors. It is commonly used for three-phase systems.

What is the function of a Type C tripping characteristic?

Type C offers protection against overloads and surges.

It allows for higher inrush currents without tripping, typical for inductive loads like motors. This balances sensitivity with operational robustness.

Can the 5SN6350-8CN MCB be used in residential applications?

While technically possible, it's primarily designed for industrial use. Its 6 kA breaking capacity might be excessive for standard residential needs. Residential applications often utilize MCBs with lower breaking capacities.

How do I reset the Siemens 5SN6350-8CN after it trips?

First, identify and clear the cause of the trip.

Then, push the breaker's toggle lever firmly to the OFF position. Finally, flip the lever back to the ON position.

What is the voltage rating of the Siemens 5SN6350-8CN?

The MCB has a rated operational voltage (Ue) of 400V AC.

This makes it suitable for standard industrial and commercial power distribution networks. Always ensure compatibility with your system voltage.

Is the Siemens 5SN6350-8CN compatible with standard DIN rails?

Yes, this MCB is designed for easy installation on standard 35mm DIN rails.

This ensures straightforward integration into most electrical enclosures and distribution boards. Proper mounting is key for thermal dissipation.

What safety standards does the 5SN6350-8CN comply with?

It complies with IEC/EN 60898-1 and IEC/EN 60947-2 standards.

These certifications ensure a high level of safety and performance for circuit protection devices. Adherence to these standards is mandatory for industrial equipment.

What is the typical lifespan or endurance of this MCB?

The Siemens 5SN6350-8CN offers significant electrical and mechanical endurance. It is rated for 10,000 electrical cycles.

Its mechanical endurance is rated for 20,000 cycles, ensuring long-term reliability in demanding environments.