Siemens 5SN6108-8CN High Breaking Capacity Miniature Circuit Breaker 1P 8A

The Siemens 5SN6108-8CN is a high-performance, 1-pole, 8-amp miniature circuit breaker (MCB) designed for robust protection in demanding electrical installations. This MCB offers superior breaking capacity, ensuring safety and reliability in residential, commercial, and industrial settings. Its key advantages include advanced thermal-magnetic tripping mechanisms for precise fault detection, a compact design for space efficiency, and compliance with stringent international safety standards. Technical parameters include a rated current of 8A, a breaking capacity of 6kA, and a Type C tripping characteristic, making it suitable for circuits with moderate inrush currents.

Product Specifications

| Specification              | Value                |

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

| Product Type               | Miniature Circuit Breaker |

| Model                      | 5SN6108-8CN          |

| Number of Poles            | 1                    |

| Rated Current (In)         | 8 A                  |

| Breaking Capacity (Icn)    | 6 kA                 |

| Tripping Characteristic    | Type C               |

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

| Frequency                  | 50/60 Hz             |

| Protection Class           | IP20                 |

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

| Mounting Type              | DIN Rail             |

| Certifications             | IEC/EN 60898-1       |

Core Features & Market Positioning

The Siemens 5SN6108-8CN stands out in the market due to its exceptional breaking capacity of 6kA, providing a high level of protection against short circuits. Its Type C tripping curve is specifically engineered to handle inductive loads that exhibit higher inrush currents than purely resistive loads, such as motors, transformers, and fluorescent lighting ballasts, without nuisance tripping. This characteristic differentiates it from Type B breakers, offering greater operational flexibility. Siemens' reputation for quality and reliability underpins the 5SN6108-8CN's market position as a trusted solution for critical power distribution, assuring users of its performance and longevity in diverse applications.

Key Application Scenarios

This 1-pole, 8A MCB is ideally suited for protecting individual circuits within residential distribution boards, ensuring the safety of lighting, small appliance circuits, and other loads with moderate starting currents. In commercial environments, it serves effectively in office spaces, retail outlets, and light industrial settings for the protection of lighting circuits, power outlets, and small machinery. Its 6kA breaking capacity makes it a suitable choice for installations where short-circuit levels are a concern, providing a reliable safeguard against potential electrical hazards. The compact 1-module width also facilitates higher circuit density in panel builds.

Practical System Integration Guidance

Integrating the Siemens 5SN6108-8CN into existing electrical systems is straightforward, as it mounts directly onto standard 35mm DIN rails. Ensure that the circuit to be protected does not exceed the breaker's 8A rating and that the overall system voltage and frequency are within the specified 230/400V AC and 50/60Hz limits. For wiring, use appropriate gauge conductors sized according to local electrical codes for an 8A load, ensuring secure termination in the breaker's terminals. Always follow lockout/tagout procedures during installation or maintenance to prevent accidental energization and ensure worker safety.

Operation and Risk Mitigation

The 5SN6108-8CN operates automatically, employing both thermal overload protection and magnetic short-circuit protection. The thermal element responds to sustained overcurrents, while the magnetic element provides rapid interruption during severe short-circuit events. To mitigate risks, always ensure correct breaker selection for the specific load type and fault current level. Avoid nuisance tripping by selecting the appropriate tripping characteristic (Type C for inductive loads). Regular visual inspection for damage and periodic testing of protective devices, as per local regulations, are recommended to maintain optimal operational safety and prevent potential electrical fires or equipment damage.

Scalability & Long-Term Value

The Siemens 5SN6108-8CN, as part of the broader Siemens SENTRON protection device portfolio, offers excellent compatibility with other Siemens circuit protection components, busbars, and switchgear. This ensures seamless integration and scalability for future system expansions or upgrades. While the 5SN6108-8CN itself is a foundational device, its robust design and adherence to international standards guarantee long-term operational value and reliability. Its ability to work within the wider Siemens ecosystem supports the development of smarter electrical installations, paving the way for potential integration with digital monitoring solutions in more advanced IIoT-enabled facilities.

FAQs

What is the primary function of the Siemens 5SN6108-8CN?

Its main role is to protect electrical circuits from overcurrents and short circuits. This prevents damage to wiring and connected equipment. It acts as an automatic safety switch.

This MCB offers reliable safeguarding for individual circuits. It ensures operational continuity and safety in various electrical installations. Its design prioritizes preventing electrical hazards.

The device interrupts the circuit when fault currents exceed its calibrated thresholds. This protects against fire risks and equipment failure, ensuring a safe electrical environment.

What does "1P 8A" signify for the Siemens 5SN6108-8CN?

"1P" indicates that it is a single-pole circuit breaker. It protects one live conductor in a circuit. This is common for single-phase applications.

"8A" denotes the rated current of the device. This is the maximum continuous current it can safely handle. It should be selected based on the circuit's load requirements.

Together, "1P 8A" specifies a single-pole breaker designed for 8 amps, suitable for protecting specific single-phase circuits. Always match this rating to the conductor's capacity.

Can the Siemens 5SN6108-8CN be used for motor protection?

Yes, its Type C tripping characteristic is suitable for motors. Type C breakers are designed for loads with moderate inrush currents. This includes many types of electric motors.

The breaker's 6kA breaking capacity also provides adequate protection against short circuits. However, for specific motor overload protection, a dedicated motor protection relay might be more appropriate.

Ensure the 8A rating is sufficient for the motor's full load current and starting characteristics. Consult motor specifications and electrical codes for proper sizing and application.

What is the breaking capacity of the Siemens 5SN6108-8CN?

The Siemens 5SN6108-8CN has a breaking capacity of 6 kA. This refers to the maximum fault current it can safely interrupt. It is rated according to IEC/EN 60898-1 standards.

A higher breaking capacity ensures greater safety in environments with higher potential short-circuit currents. This makes it suitable for many residential and commercial distribution systems.

This 6kA rating provides robust protection against severe short-circuit events, preventing catastrophic damage to the electrical system and ensuring personnel safety.

How does the Type C tripping characteristic benefit users?

Type C breakers are designed to tolerate higher inrush currents than Type B breakers. This prevents nuisance tripping when connecting devices with inductive loads.

Examples of such devices include transformers, motors, and fluorescent lighting fixtures. The Type C curve allows for these momentary surges without interrupting power unnecessarily.

This characteristic ensures operational stability for circuits with moderate inductive loads, minimizing downtime and enhancing user convenience in commercial and light industrial settings.

What is the voltage rating of the Siemens 5SN6108-8CN?

This MCB is rated for a voltage of 230/400V AC. This covers typical single-phase (230V) and three-phase (400V) applications. It adheres to common European voltage standards.

The rating ensures safe and effective operation within standard power distribution networks. It is important to verify that the system voltage does not exceed this specified limit.

Using the breaker within its rated voltage range is crucial for reliable protection and to prevent electrical failure or hazards. Always confirm compatibility with your electrical system.

Is the Siemens 5SN6108-8CN suitable for industrial applications?

Yes, it is suitable for light industrial applications. Its 6kA breaking capacity and Type C characteristic offer good protection for many industrial circuits. It can protect lighting or small machinery.

For heavy industrial environments with very high fault currents or specialized motor protection needs, higher rated MCBs or other protection devices may be necessary. Always assess the specific industrial demand.

It provides a reliable and cost-effective protection solution for less demanding industrial tasks, leveraging Siemens' quality standards for dependable performance.

What type of DIN rail can be used to mount this MCB?

The Siemens 5SN6108-8CN is designed for mounting on a standard 35mm DIN rail. This is the most common type of rail used in electrical enclosures. Proper rail selection ensures secure installation.

Ensure the DIN rail is firmly mounted within the enclosure. The MCB snaps onto the rail, providing a stable and organized mounting solution for electrical components.

Using the correct 35mm DIN rail ensures the MCB is held securely in place, preventing vibration-related issues and allowing for easy access for maintenance or future modifications.

What are the typical operating temperature limits?

The operating temperature range for this MCB is from -25°C to +45°C. This wide range allows for installation in various environmental conditions. It covers most ambient temperature fluctuations.

Operating the breaker outside these limits can affect its performance and lifespan. Extreme temperatures can impact the tripping characteristics and material integrity.

Maintaining the breaker within its specified temperature range ensures reliable fault detection and prolonged service life, crucial for safety and operational efficiency.

Where can I find replacement parts or accessories for the 5SN6108-8CN?

Replacement parts are typically available through authorized Siemens distributors and electrical wholesale suppliers. You can also find accessories like auxiliary contacts or shunt releases.

Consult Siemens' official product catalog or website for specific part numbers and compatibility information. This ensures you are ordering genuine components.

Purchasing from authorized channels guarantees the quality and compatibility of any accessories or replacement components, maintaining the integrity of your electrical system.