Siemens 5SY6108-8CC Motor Protection Miniature Circuit Breaker 1P 8A

The Siemens 5SY6108-8CC is a 1-pole, 8A miniature circuit breaker (MCB) designed for robust motor protection in industrial applications. This device offers superior tripping characteristics, enhanced safety, and reliable performance, ensuring the longevity of connected motors. Its compact design and high breaking capacity make it an ideal choice for demanding electrical installations.

Siemens 5SY6108-8CC: Product Specifications

| Feature                 | Specification                         |

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

| Product Type            | Miniature Circuit Breaker (MCB)       |

| Manufacturer            | Siemens                               |

| Series                  | 5SY6                              |

| Number of Poles         | 1                                     |

| Rated Current (In)      | 8 A                                   |

| Tripping Curve          | C (suitable for inductive loads)      |

| Breaking Capacity (Icn) | 10 kA                                 |

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

| Frequency               | 50/60 Hz                              |

| Protection Class        | IP20                                  |

| Mounting Type           | DIN Rail                              |

| Terminal Type           | Screw Terminal                        |

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

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

Core Features & Market Positioning

The Siemens 5SY6108-8CC distinguishes itself through its advanced thermal-magnetic tripping mechanism, providing precise overload and short-circuit protection crucial for safeguarding motors against damaging currents. Its Type C tripping curve is specifically engineered to handle the inrush currents associated with motor starting, preventing nuisance tripping while still offering rapid response to faults. This combination of reliability and specific motor protection capabilities positions the 5SY6108-8CC as a preferred component in demanding industrial control panels and distribution systems where motor integrity is paramount. The device's high breaking capacity of 10 kA ensures it can safely interrupt fault currents, contributing to overall system safety and compliance with stringent electrical codes.

Key Application Scenarios

This 1-pole, 8A motor protection MCB is extensively utilized in a variety of industrial and commercial settings where reliable protection of single-phase motors is required. Common applications include the control and protection of small pumps, fans, conveyors, and other motor-driven machinery in manufacturing plants, HVAC systems, and automated production lines. Its suitability for frequent switching operations and its robust construction make it ideal for use in control circuits, building automation, and machinery where consistent operation is critical. The 5SY6108-8CC is a standard component for ensuring the operational continuity and protection of essential motor loads.

Practical System Integration Guidance

Integrating the Siemens 5SY6108-8CC into existing or new electrical systems is straightforward due to its standard DIN rail mounting and familiar terminal configurations. Installation involves securely mounting the MCB onto a 35mm top-hat DIN rail. Wiring is accomplished via screw terminals, accommodating conductors typically ranging from 1.5 mm² to 10 mm². Proper torque application, as specified by Siemens, is essential for ensuring secure connections and preventing overheating. For motor circuits, it's crucial to correctly size the MCB according to the motor's full load current and starting characteristics, adhering to the selected tripping curve (Type C in this case).

Operation and Risk Mitigation

The Siemens 5SY6108-8CC operates by employing a bimetallic strip for overload protection and an electromagnetic coil for short-circuit protection. Overloads cause the bimetallic strip to heat up and bend, eventually tripping the mechanism. Short circuits induce a strong magnetic field in the coil, which directly trips the breaker instantaneously. Risk mitigation is inherent in the product's design; however, proper installation and adherence to operational guidelines are vital. Avoid operating the breaker outside its specified environmental conditions, and ensure it is correctly sized for the connected load to prevent premature failure or inadequate protection.

Scalability & Long-Term Value

While the Siemens 5SY6108-8CC is a standalone protection device, its integration within the broader Siemens industrial automation ecosystem offers significant long-term value. It is compatible with other Siemens components within the 5SY series and broader SENTRON product line, allowing for modular system expansion. For modern facilities, integration into SCADA systems or IIoT platforms can be achieved through associated current monitoring relays or smart meter integration, providing remote diagnostics and predictive maintenance capabilities. This ensures that the protection strategy can evolve alongside technological advancements and operational demands.

Frequently Asked Questions (FAQs)

What is the tripping curve of the Siemens 5SY6108-8CC?

The Siemens 5SY6108-8CC features a Type C tripping curve. This characteristic is designed for loads with moderate inrush currents, such as motors.

This curve ensures that the breaker will not trip during the initial surge of current when a motor starts. It provides a balance between sensitive overload protection and the ability to handle transient high currents.

Type C breakers are ideal for inductive loads, offering reliable operation in environments with frequent motor start-ups.

How do I wire the Siemens 5SY6108-8CC miniature circuit breaker?

Wiring the 5SY6108-8CC involves connecting the power source to the line side and the load to the load side terminals. Use appropriate conductor sizes for the 8A rating, typically between 1.5mm² and 10mm².

Ensure the conductors are stripped to the correct length and securely fastened within the screw terminals. Always apply the recommended torque to prevent loose connections, which can lead to overheating and potential failure.

Before energizing, double-check all connections for polarity and integrity, ensuring the breaker is correctly seated on the DIN rail.

What is the breaking capacity of the Siemens 5SY6108-8CC?

The Siemens 5SY6108-8CC has a breaking capacity of 10 kA. This is the maximum fault current the breaker can safely interrupt without sustaining damage.

A 10 kA rating is generally sufficient for most residential, commercial, and light industrial applications. It ensures the device can effectively clear short-circuit faults, protecting downstream equipment and personnel.

When selecting a circuit breaker, it's crucial that its breaking capacity exceeds the prospective short-circuit current at the point of installation to guarantee safe operation.

Can the Siemens 5SY6108-8CC be used for single-phase motor protection?

Yes, the Siemens 5SY6108-8CC is specifically designed for motor protection. Its 1-pole configuration and 8A rating are suitable for many single-phase motor applications.

The Type C tripping curve is advantageous for motors, as it accommodates the higher inrush current during startup. This prevents nuisance tripping while still providing effective overload and short-circuit protection.

Always verify that the motor's full load current and starting characteristics are within the breaker's specified limits for optimal performance and safety.

What are the key advantages of using Siemens 5SY6 MCBs?

Siemens 5SY MCBs offer high reliability and precise tripping characteristics for effective protection. They are built with robust materials for durability in industrial environments.

These breakers provide excellent discrimination capabilities, allowing for selective tripping in complex electrical systems. Their compact design saves panel space.

Siemens' commitment to quality and adherence to international standards like IEC/EN ensure that 5SY MCBs deliver consistent performance and safety.

How does the thermal-magnetic trip unit work in the 5SY6108-8CC?

The thermal element uses a bimetallic strip that heats up due to overcurrent, causing it to bend and trip the breaker. This protects against sustained overloads.

The magnetic element uses an electromagnet that reacts instantly to high fault currents, providing rapid tripping during short circuits. This ensures fast protection against dangerous electrical faults.

Together, these elements offer comprehensive protection against both gradual overloads and sudden short circuits, safeguarding connected equipment.

What is the recommended ambient operating temperature range for this MCB?

The Siemens 5SY6108-8CC is designed to operate reliably within an ambient temperature range of -25°C to +55°C. This wide range ensures performance in diverse environmental conditions.

Operating the breaker within this specified range is crucial for maintaining its accurate tripping characteristics. Extreme temperatures can affect the thermal element's sensitivity.

If installed in environments that exceed these limits, derating or alternative protection solutions may be necessary to ensure safe and effective operation.

Is the Siemens 5SY6108-8CC compatible with other Siemens circuit protection devices?

Yes, the 5SY6108-8CC is part of the Siemens SENTRON protection devices range. It is designed for seamless integration with other Siemens components in distribution boards and control panels.

This compatibility allows for building comprehensive and coordinated protection systems. It ensures that different protective devices work together effectively to isolate faults.

It is recommended to consult Siemens' product selection tools or technical documentation for specific compatibility information within larger systems.

What does "1P" mean in the product name Siemens 5SY6108-8CC?

"1P" in the product name signifies that the miniature circuit breaker has one pole. This means it is designed to protect and switch a single electrical conductor.

Single-pole breakers are commonly used in single-phase circuits, such as those for lighting, outlets, or small motor loads where only one live conductor needs to be switched.

For higher voltage systems or three-phase loads, multi-pole breakers (e.g., 2P, 3P, 4P) are required to provide complete isolation of all conductors.

Where can I find the datasheet or technical documentation for the Siemens 5SY6108-8CC?

Datasheets and comprehensive technical documentation for the Siemens 5SY6108-8CC can typically be found on the official Siemens Industry Automation or Siemens Digital Industries website.

These documents provide detailed specifications, installation instructions, application guidelines, and dimensional drawings. They are essential resources for engineers and electricians.

Searching the Siemens website using the product number "5SY6108-8CC" and looking for "Product Data Sheet" or "Technical Manual" will usually yield the required information.