Siemens 5SN6625-8CN High Breaking Capacity MCB for Industrial Motors 3P+N 25A

The Siemens 5SN6625-8CN is a robust, 3-pole + Neutral, 25A High Breaking Capacity Miniature Circuit Breaker (MCB) engineered for demanding industrial motor applications. This device offers superior protection against overcurrents and short circuits, ensuring the operational integrity and longevity of critical industrial machinery. Its key advantages lie in its high breaking capacity, reliable tripping characteristics, and advanced safety features, all within a compact and user-friendly design. With a rated voltage of 400V AC and a breaking capacity of 10kA, the 5SN6625-8CN is built to withstand the strenuous conditions typical of industrial environments, safeguarding both equipment and personnel.

Siemens 5SN6625-8CN: Product Specifications

| Parameter                       | Value               |

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

| Product Type                    | MCB                 |

| Number of Poles                 | 3P+N (3-Pole + Neutral) |

| Rated Current (In)              | 25A                 |

| Rated Voltage (Ue)              | 400V AC             |

| Breaking Capacity (Icn)         | 10kA                |

| Tripping Characteristic         | C                   |

| Frequency                       | 50/60 Hz            |

| Protection Class                | IP20                |

| Mounting Type                   | DIN Rail            |

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

| Certifications                  | CE, IEC             |

Core Features & Market Positioning

The Siemens 5SN6625-8CN distinguishes itself through its high breaking capacity (10kA), a critical parameter for industrial motor circuits where fault currents can be substantial. This ensures effective interruption of fault currents, preventing catastrophic damage to motors and associated electrical infrastructure. Its Type C tripping characteristic provides a balance between preventing nuisance tripping from motor inrush currents and ensuring rapid response to short circuits, making it ideal for inductive loads. Siemens' reputation for reliability and quality manufacturing underpins the market positioning of this MCB, offering industrial users a trusted solution for motor protection that minimizes downtime and maintenance costs.

Key Application Scenarios

This Siemens 5SN6625-8CN MCB is specifically designed for the protection of industrial motors across a wide spectrum of applications. This includes its use in pump control systems, conveyor belt drives, fan units, and general-purpose machinery found in manufacturing plants, processing facilities, and automated production lines. The 3P+N configuration is particularly advantageous for three-phase motors with neutral connections, offering comprehensive circuit protection. Its robust design makes it suitable for environments with high ambient temperatures or potential for electrical disturbances, common in heavy industry.

Practical System Integration Guidance

Integrating the Siemens 5SN6625-8CN MCB into industrial electrical systems is straightforward due to its standard DIN rail mounting and terminal design. For wiring, ensure that the main power supply conductors are connected to the line terminals and the motor leads are connected to the load terminals, observing correct phase and neutral connections. The circuit breaker should be installed in a suitable enclosure to maintain its IP20 protection rating and to guard against dust and accidental contact. Proper torque should be applied to the terminal screws to ensure a secure connection and prevent overheating. Always disconnect power before installation or maintenance.

Operation and Risk Mitigation

The primary function of the Siemens 5SN6625-8CN MCB is to protect electrical circuits from overloads and short circuits. Overloads occur when a motor draws more current than its rated capacity for an extended period, leading to overheating. Short circuits are sudden, high-current events caused by insulation failure or direct contact between conductors. The MCB's thermal element responds to overloads, while the magnetic element reacts to short circuits, rapidly opening the circuit to prevent damage. Key risk mitigation strategies include ensuring the MCB is correctly rated for the motor's full load current and starting characteristics, and that it is properly installed and maintained. Regular visual inspections for signs of wear or damage are recommended.

Scalability & Long-Term Value

The Siemens 5SN6625-8CN offers inherent long-term value through its durability and compatibility with established Siemens industrial control and automation platforms. While MCBs themselves are protective devices rather than active control components, their reliable operation ensures the longevity of connected equipment, reducing the total cost of ownership. For systems requiring enhanced monitoring or remote control capabilities, this MCB can be integrated into larger control panels alongside smart relays, PLCs, or communication modules that provide such advanced functionalities. Its adherence to international standards ensures it remains a relevant component in evolving industrial electrical infrastructure.

FAQs

What is the breaking capacity of the Siemens 5SN6625-8CN MCB?

The breaking capacity is 10kA. This is crucial for industrial motors.

It ensures protection against severe short circuits. Higher breaking capacity means better fault interruption.

This value prevents damage to downstream equipment and wiring.

What type of load is the Siemens 5SN6625-8CN MCB suitable for?

It's designed for industrial motors. Its Type C characteristic suits inductive loads.

The 3P+N configuration is ideal for three-phase motors with a neutral connection.

Applications include pumps, fans, and conveyor systems.

How do I properly wire the Siemens 5SN6625-8CN MCB?

Connect incoming power to the line terminals. Motor leads connect to the load terminals.

Ensure correct phase and neutral connections for the 3P+N setup.

Use appropriate torque on terminal screws for secure connections.

What is the rated voltage for this MCB?

The rated voltage is 400V AC. This is standard for industrial three-phase systems.

It is designed for the typical voltages used in industrial settings.

Verify system voltage matches the MCB's rating for safe operation.

Can the Siemens 5SN6625-8CN MCB be used for single-phase applications?

No, it is a 3P+N (3-pole + Neutral) device. It's intended for three-phase motor protection.

Using it for single-phase loads would be incorrect and unsafe.

The neutral pole is essential for specific three-phase motor configurations.

What does the 'C' in Type C tripping characteristic mean?

'C' indicates its tripping curve for inductive loads. It allows for higher inrush currents.

This prevents nuisance tripping during motor startup.

It still provides rapid protection against short circuits.

What is the protection class of this MCB?

The protection class is IP20. This means it's protected against solid objects >12.5mm.

It also offers protection against accidental contact.

This rating necessitates installation within an enclosure for full protection.

What is the ambient temperature range for operation?

The operating temperature range is -25 to +45°C. This is typical for industrial environments.

Adhering to this range ensures reliable performance and longevity.

Operating outside this range can affect tripping characteristics and lifespan.

Where can I find the full product specifications?

Key specifications like breaking capacity, poles, and current are provided.

For complete details, consult the official Siemens product documentation.

Always refer to manufacturer datasheets for comprehensive technical data.

Is this MCB compatible with other Siemens industrial components?

Yes, Siemens components generally offer good system compatibility.

It integrates well within Siemens' broader range of control and protection devices.

Ensure specific component ratings and standards align for seamless integration.