Siemens 5SY6108-7CC Single Pole 5SY Protection Circuit Breaker 1P 8A

The Siemens 5SY6108-7CC single-pole 5SY protection circuit breaker is a crucial component for reliable electrical system protection. Engineered for demanding industrial and building applications, this 1-pole, 8A circuit breaker offers a robust 6kA breaking capacity, ensuring swift and effective response to overcurrent and short-circuit faults. Its Type C tripping characteristic makes it ideal for circuits with moderate inrush currents, such as lighting and socket outlets. The compact design and DIN rail mounting facilitate easy integration into control cabinets and distribution boards.

Product Specifications

| Specification              | Value                                     |

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

| Product Type               | Miniature Circuit Breaker                 |

| Manufacturer               | Siemens                                   |

| Series                     | 5SY6                                      |

| Poles                      | 1                                         |

| Rated Current              | 8 A                                       |

| Rated Voltage              | 230/400 V AC                              |

| Breaking Capacity          | 6 kA                                      |

| Tripping Characteristic    | C                                         |

| Mounting Type              | DIN Rail                                  |

| Protection Rating          | IP20                                      |

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

| Connection Type            | Screw Terminals                           |

| Conductor Cross-Section    | 0.75 mm² to 35 mm² (Solid/Stranded)       |

| Tightening Torque          | 2.5 - 3.5 N·m                             |

| Mechanical Service Life    | 10,000 operating cycles (typical)         |

| Overvoltage Category       | III                                       |

| Degree of Pollution        | 3                                         |

| Energy Limitation Class    | 3                                         |

| Dissipation Power Loss     | 0.9 W (per pole at AC rated current)      |

| Country of Origin          | China (for 5SY6108-7CC), Germany (for 5SY6108-7) |

Core Features & Market Positioning

The Siemens 5SY6108-7CC distinguishes itself through its combination of reliability, ease of installation, and advanced safety features, positioning it as a preferred choice for supplementary protection in various electrical installations. Siemens' reputation for quality and innovation in electrical components underpins its market standing. The 5SY series, in general, is designed for high functionality in complex buildings and industrial environments. A key advantage is the "window design" which clearly indicates the contact status, with green signifying disconnection and red indicating power on. Furthermore, the anti-finger contact design on the terminal blocks enhances safety during installation and maintenance by minimizing the risk of electric shock. This focus on user safety and operational clarity is a significant differentiator. The product also benefits from a sliding buckle design for tool-free installation and removal, improving efficiency.

Key Application Scenarios

This Siemens 5SY6108-7CC miniature circuit breaker is ideally suited for a range of applications requiring reliable overcurrent protection. Its primary role is often as a supplementary protector, offering an additional layer of safety alongside a main branch circuit protection device. Common scenarios include protecting circuits in air-conditioning and ventilation systems, control cabinets, and controllers. It is also well-suited for residential and infrastructure applications, and specifically for socket outlet and lighting circuits where a switchable neutral conductor is needed. The Type C characteristic also makes it appropriate for circuits with moderate inductive loads or inrush currents, common in commercial buildings and small industrial setups.

Practical System Integration Guidance

Integrating the Siemens 5SY6108-7CC into existing systems is straightforward due to its standard DIN rail mounting and user-friendly terminal design. The device accepts conductor cross-sections from 0.75 mm² to 35 mm², and features double terminal chambers that allow for the connection of two wires of different cross-sections simultaneously, simplifying wiring. For secure connections, a tightening torque of 2.5 to 3.5 N·m is recommended for the screw terminals. The breaker can be easily mounted or removed from the busbar using its sliding buckle, often without the need for specialized tools, which significantly speeds up installation and maintenance processes. The top and bottom terminals are identical, allowing for flexible infeed connections.

Operation and Risk Mitigation

Operating the Siemens 5SY6108-7CC circuit breaker involves simple manual actuation of the handle. The breaker is designed with touch protection for terminals, significantly reducing the risk of accidental contact and electric shock during operation and maintenance. In the event of an overload or short circuit, the breaker will trip, disconnecting the power to the protected circuit. Clear visual indicators on the front of the device show the operational status (ON/OFF). Troubleshooting typically involves identifying the cause of the trip, such as a persistent overload or a short circuit, and then manually resetting the breaker once the fault is cleared. For enhanced diagnostics and system integration, auxiliary switches and fault signal contacts can be fitted to the side of the breaker, providing remote indication of its status.

Scalability & Long-Term Value

The Siemens 5SY6108-7CC offers excellent long-term value through its compatibility with Siemens' broader SENTRON product portfolio. This allows for seamless integration with other protection, switching, measuring, and monitoring devices, creating a comprehensive and scalable low-voltage power distribution system. The ability to easily add accessories like auxiliary switches and fault signal contacts enhances its functionality and adaptability to evolving system requirements. While this specific model is designed for individual pole protection, Siemens offers a range of 5SY series breakers in multi-pole configurations, providing upgrade paths for systems requiring higher capacity or different configurations. The robust construction and adherence to international standards (IEC60898-1, IEC60947-2, GB10963.1/.2, GB14048.2) ensure durability and reliable performance over an extended operational life.

Frequently Asked Questions (FAQs)

Q1: What are the main advantages of the Siemens 5SY6108-7CC circuit breaker?

The Siemens 5SY6108-7CC offers enhanced safety with its touch-protected terminals. It provides reliable overcurrent and short-circuit protection suitable for various applications. The breaker features a clear visual status indicator for easy monitoring of its operational state.

Its compact design and DIN rail compatibility simplify installation within control panels and distribution boards. The user-friendly design, including tool-free mounting options, contributes to efficient system integration and maintenance.

The breaker's C-curve tripping characteristic makes it suitable for circuits with moderate inrush currents, common in lighting and socket circuits. This versatility ensures broad applicability across industrial and residential settings.

Q2: What types of applications is the Siemens 5SY6108-7CC best suited for?

This circuit breaker is ideal for supplementary protection in electrical systems. It provides an additional layer of safety alongside primary branch circuit protection devices.

Key applications include protecting circuits in control cabinets, HVAC systems, and general building electrical installations. Its 8A rating and Type C curve are well-suited for lighting and socket outlet circuits.

It is also used in industrial settings for protecting control circuits and ensuring selectivity between protection devices. Its robustness makes it dependable for continuous operation in demanding environments.

Q3: How do I properly install the Siemens 5SY6108-7CC circuit breaker?

Installation involves mounting the breaker onto a standard DIN rail within an enclosure. Ensure the rail is securely fixed and provides adequate space.

Connect the incoming power wires to the designated terminal on the top of the breaker, and outgoing load wires to the terminal on the bottom. Use appropriate conductor sizes and ensure terminals are tightened to the recommended torque.

The breaker features a sliding buckle for easy attachment and removal from the DIN rail, often without tools. Always verify connections are secure and that the breaker is fully engaged on the rail before energizing the circuit.

Q4: What does the 'C' in 5SY6108-7CC signify regarding its tripping characteristic?

The 'C' denotes the tripping characteristic of the circuit breaker. This indicates how quickly the breaker will trip in response to an overcurrent.

Type C breakers are designed to trip between 5 to 10 times their rated current. This characteristic is suitable for circuits with moderate inrush currents, such as lighting, general purpose outlets, and motors.

It provides a balance between protection against short circuits and tolerance for temporary, higher-than-normal current draws that occur during equipment startup.

Q5: What is the breaking capacity (kA) of the Siemens 5SY6108-7CC, and why is it important?

The Siemens 5SY6108-7CC has a breaking capacity of 6 kA. This rating represents the maximum fault current the breaker can safely interrupt without sustaining damage.

A higher breaking capacity is crucial for ensuring the safety and reliability of the electrical system. It means the breaker can handle significant short-circuit currents that might occur.

This specification is vital for selecting the correct protective device based on the potential fault levels in the installation, ensuring effective protection against severe electrical events.

Q6: Can the Siemens 5SY6108-7CC be used in both AC and DC applications?

This specific model, the 5SY6108-7CC, is designed for AC (Alternating Current) applications, rated for 230/400V AC. It is not intended for DC (Direct Current) circuits.

Using an AC-rated breaker on a DC circuit can be dangerous and ineffective. DC circuits have different arc-quenching requirements that AC breakers are not designed to handle.

Siemens does offer specific DC miniature circuit breakers within other product families if DC protection is required. Always consult the product specifications to ensure correct application.

Q7: What is the significance of the IP20 rating on this circuit breaker?

The IP20 rating indicates the level of protection against solid objects and water. Specifically, '2' means it is protected against solid objects larger than 12.5 mm (like a finger).

The '0' means there is no specific protection against water ingress. Therefore, the breaker is suitable for dry, indoor environments and should be installed within an enclosure.

This rating ensures basic protection for users against accidental contact with live parts and is standard for indoor electrical components.

Q8: How does the Siemens 5SY6108-7CC offer touch protection?

Touch protection is achieved through the design of the terminal blocks. These terminals are covered to prevent accidental direct contact with live electrical parts.

This feature is critical for enhancing user safety during installation, wiring, and maintenance. It minimizes the risk of electric shock, especially in environments where frequent access to electrical panels occurs.

The integrated design of the touch protection ensures it remains effective throughout the operational life of the breaker.

Q9: Can I add accessories like auxiliary switches to the Siemens 5SY6108-7CC?

Yes, the Siemens 5SY6108-7CC is compatible with various accessories, including auxiliary switches and fault signal contacts. These can be mounted on the side of the breaker.

Auxiliary switches can be used for remote signaling of the breaker's status (e.g., ON/OFF). Fault signal contacts can alert a control system or operator when the breaker has tripped.

These accessories enhance the breaker's functionality, enabling better system monitoring, control, and integration with automation systems.

Q10: What is the typical lifespan or mechanical service life of this circuit breaker?

The Siemens 5SY6108-7CC has a typical mechanical service life of 10,000 operating cycles. This refers to the number of times the breaker can be manually switched ON and OFF without mechanical failure.

The electrical service life, which depends on the number and severity of fault interruptions, will be less than the mechanical life. However, for standard overcurrent events, it provides robust protection.

Regular inspection and proper operation according to manufacturer guidelines will help ensure optimal performance and longevity.