Siemens 5SN6425-8CN Protection Circuit Breaker Switch 4P 25A

The Siemens 5SN6425-8CN is a robust 4-pole, 25A protection circuit breaker switch designed for reliable electrical circuit protection in demanding industrial environments. Its key advantages include superior breaking capacity, enhanced safety features, and excellent durability, ensuring uninterrupted power distribution and equipment safeguarding. Core technical parameters highlight its 4-pole configuration, a rated current of 25A, and a breaking capacity suitable for industrial applications. This device exemplifies Siemens' commitment to delivering high-performance, dependable electrical components.

Siemens 5SN6425-8CN: Product Specifications

| Parameter              | Specification                                  |

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

| Product Type           | Protection Circuit Breaker Switch              |

| Pole Configuration     | 4-Pole (4P)                                    |

| Rated Current (In)     | 25A                                            |

| Breaking Capacity (Icn) | 10kA (IEC 60898-1)                             |

| Voltage Rating (Un)    | 230/400V AC                                    |

| Frequency              | 50/60 Hz                                       |

| Tripping Characteristic | Type C (for inductive loads)                   |

| Protection Type        | Overcurrent and Short-Circuit Protection       |

| Mounting Type          | DIN Rail (35mm)                                |

| Terminal Type          | Screw Terminals                                |

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

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

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

| Color                  | White/Grey                                     |

Core Features & Market Positioning

The Siemens 5SN6425-8CN stands out in the industrial protection market due to its robust construction and adherence to stringent international standards like IEC 60898-1 and IEC 60947-2. Its Type C tripping characteristic makes it particularly well-suited for circuits with moderate inductive loads, such as motors and transformers, offering enhanced protection against inrush currents without nuisance tripping. This differentiates it from basic miniature circuit breakers, positioning it as a reliable choice for critical power distribution in commercial and light industrial settings. The 10kA breaking capacity provides a significant safety margin for fault conditions.

Key Application Scenarios

This 4-pole, 25A circuit breaker is extensively used in main distribution boards and sub-distribution boards within industrial plants, commercial buildings, and data centers. It is ideal for protecting individual circuits supplying machinery, lighting systems, and HVAC equipment where a higher degree of protection is required. Its application extends to environments necessitating the isolation of all phases simultaneously due to its 4-pole design, crucial for systems with three-phase loads or those requiring complete circuit de-energization for maintenance. The 25A rating makes it suitable for circuits with moderate power demands.

Practical System Integration Guidance

Installing the Siemens 5SN6425-8CN is straightforward, as it features a standard 35mm DIN rail mounting system. Ensure that the incoming and outgoing line connections are correctly made to the respective terminals, observing the correct phase and neutral assignments for a 4-pole device. The screw terminals provide a secure connection for conductors up to the maximum rated size. For commissioning, verify that the breaker trips reliably when subjected to a test current exceeding its rated tripping current, ensuring proper overcurrent and short-circuit protection is active.

Operation and Risk Mitigation

Safe operation of the Siemens 5SN6425-8CN involves understanding its tripping mechanism. Overcurrents or short circuits will cause the internal bimetallic strip or electromagnet to actuate, rapidly opening the circuit to prevent damage and fire hazards. To mitigate risks, always ensure the breaker is rated appropriately for the connected load and ambient temperature. Never attempt to bypass the tripping mechanism or operate the breaker with damaged components. Regularly inspect terminals for tightness and signs of overheating.

Scalability & Long-Term Value

The Siemens 5SN6425-8CN integrates seamlessly into existing Siemens electrical distribution systems and is compatible with a wide range of modular DIN-rail mounted devices. While circuit breakers themselves are typically end-point protection devices, their longevity and reliability contribute to the overall stability and long-term value of an electrical installation. For future upgrades or increased capacity requirements in a distribution panel, this breaker can be replaced with a higher-rated Siemens unit, provided the upstream protection and wiring are also upgraded accordingly.

Frequently Asked Questions (FAQs)

What is the breaking capacity of the Siemens 5SN6425-8CN?

The Siemens 5SN6425-8CN offers a breaking capacity of 10kA. This signifies its ability to safely interrupt fault currents up to 10,000 Amperes without damage.

This high breaking capacity is essential for industrial environments where short circuits can generate significant energy. It ensures personnel safety and protects connected equipment from severe damage during fault events.

Adhering to IEC 60898-1 standards, this rating provides confidence in the breaker's performance under strenuous fault conditions, making it a reliable choice for critical power circuits.

What type of loads is the Siemens 5SN6425-8CN suitable for?

This circuit breaker is specifically designed with a Type C tripping characteristic. This makes it ideal for inductive loads that experience higher inrush currents upon startup.

Examples of suitable loads include motors, transformers, and fluorescent lighting ballasts. The Type C curve allows for temporary overcurrents during motor start-up without tripping unnecessarily.

However, it is generally not recommended for very high inrush loads like large transformers or power factor correction capacitors, where Type D breakers might be more appropriate.

Can the Siemens 5SN6425-8CN be used for DC applications?

The Siemens 5SN6425-8CN is designed and certified for AC (Alternating Current) applications only. Its tripping mechanisms and insulation are optimized for the characteristics of AC power systems.

Attempting to use this breaker in a DC (Direct Current) circuit can lead to unpredictable performance and potential failure to interrupt the circuit safely. DC arcs are more difficult to extinguish than AC arcs.

For DC circuit protection, it is imperative to use circuit breakers specifically designed and rated for DC voltage and current applications, ensuring proper safety and functionality.

How is the Siemens 5SN6425-8CN installed?

Installation is facilitated by its standard 35mm DIN rail mounting. Secure the breaker onto the rail by clipping it into place, ensuring it is firmly seated.

Connect the incoming power supply wires to the appropriate terminals, typically at the top, and the outgoing load wires to the terminals at the bottom. Ensure correct phase and neutral connections for the 4-pole configuration.

Always disconnect the main power supply before installation and verify all connections are tight and correctly wired to prevent electrical hazards. Consult the product manual for detailed wiring diagrams.

What does the "4P" in 5SN6425-8CN signify?

The "4P" designation indicates that the Siemens 5SN6425-8CN is a 4-pole circuit breaker. This means it has four individual poles, each capable of switching and protecting a separate circuit.

In a typical 4-pole setup for AC power, three poles are used for the three phases of a three-phase system, and the fourth pole is used for the neutral conductor. This ensures complete isolation of all conductors.

This configuration is crucial for systems requiring simultaneous disconnection of all phases and the neutral, enhancing safety during maintenance or fault conditions, especially in three-phase power distribution.

What is the rated current of this Siemens breaker?

The Siemens 5SN6425-8CN has a rated current of 25 Amperes (25A). This is the maximum continuous current the breaker can carry under normal operating conditions without tripping.

It is vital to select a circuit breaker with a rated current that matches or is slightly above the expected continuous load current of the circuit it is protecting. This ensures efficient protection against overloads.

Exceeding the 25A rating for extended periods will cause the breaker to trip, interrupting power to prevent overheating and potential damage to wiring and connected equipment.

What are the dimensions of the Siemens 5SN6425-8CN?

While specific external dimensions can vary slightly, the Siemens 5SN6425-8CN is designed to fit standard modular electrical enclosures. It typically occupies a certain number of DIN modules.

The critical aspect for installation is its compatibility with standard 35mm wide DIN mounting rails. This ensures it can be easily integrated alongside other modular devices like contactors, relays, and other breakers.

For precise physical dimensions required for enclosure planning, referring to the detailed datasheet or product catalog from Siemens is recommended, but it adheres to industry-standard modular widths.

What is the tripping characteristic of the Siemens 5SN6425-8CN?

The Siemens 5SN6425-8CN features a Type C tripping characteristic. This means it is designed to trip at a higher current level than Type B breakers, typically between 5 to 10 times the rated current.

This characteristic is specifically suited for circuits supplying equipment with moderate inductive loads or high inrush currents, such as motors or transformers, preventing nuisance tripping during startup.

If your application involves very high inrush currents, such as large motors or specific types of lighting, a Type D breaker might be a more suitable choice.

What standards does the Siemens 5SN6425-8CN comply with?

The Siemens 5SN6425-8CN complies with major international electrical safety standards. This includes IEC 60898-1 and IEC 60947-2.

IEC 60898-1 covers circuit breakers for household and similar installations, ensuring a baseline of safety and performance for general use. IEC 60947-2 is a more rigorous standard for low-voltage switchgear and controlgear.

Compliance with these standards confirms that the product has undergone rigorous testing and meets stringent requirements for performance, safety, and reliability in electrical distribution systems.

Where can I find the user manual or datasheet for this product?

The most comprehensive technical documentation, including user manuals and detailed datasheets, for the Siemens 5SN6425-8CN can typically be found on the official Siemens Industry or Siemens Digital Industries website.

Siemens provides extensive online product catalogs and support sections where users can download PDFs of datasheets, installation guides, and technical specifications by searching for the exact product number (5SN6425-8CN).

These documents will offer in-depth information on installation, operation, maintenance, wiring diagrams, and precise technical parameters not covered in brief overviews.