Siemens 5SN6613-8CN High Breaking Capacity MCB for Motor Starting 3P+N 13A

The Siemens 5SN6613-8CN is a robust 3-pole + Neutral High Breaking Capacity Miniature Circuit Breaker (MCB) engineered specifically for motor starting applications, offering a rated current of 13A. This advanced protection device ensures reliable circuit interruption and safeguarding against overloads and short circuits crucial for industrial motor control systems. Its key advantages include a high breaking capacity, ensuring safety even under fault conditions, and a design optimized for the unique demands of motor circuits. Core technical parameters include a 3P+N configuration, a 13A rated current, and a breaking capacity designed to handle motor inrush currents.

Siemens 5SN6613-8CN: Product Specifications

| Parameter                 | Specification               |

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

| Product Type              | Miniature Circuit Breaker   |

| Model Number              | 5SN6613-8CN                 |

| Poles                     | 3P + N                      |

| Rated Current (In)        | 13 A                        |

| Breaking Capacity (Icn)   | 6 kA (IEC standards)        |

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

| Rated Voltage (Ue)        | 400V AC                     |

| Frequency                 | 50/60 Hz                    |

| Terminal Type             | Screw Terminals             |

| Mounting Type             | DIN Rail (35mm)             |

| Protection Class          | IP20                        |

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

Core Features & Market Positioning

The Siemens 5SN6613-8CN distinguishes itself through its "High Breaking Capacity" (HBC) rating, typically 6 kA according to IEC standards, which is essential for motor starting circuits where significant inrush currents can occur. This feature provides superior protection against severe short-circuit faults, preventing catastrophic damage to equipment and ensuring personnel safety. Its Type C tripping characteristic is specifically designed to accommodate the higher starting currents of motors without nuisance tripping, offering a balanced approach between sensitive overload protection and the transient demands of motor loads. Positioned as a reliable and durable solution for industrial automation and control panels, the 5SN6613-8CN leverages Siemens' reputation for quality and engineering excellence, making it a preferred choice for applications demanding robust and consistent performance.

Key Application Scenarios

This Siemens MCB is ideally suited for protecting individual motor circuits in various industrial settings. Common applications include safeguarding motors in conveyor systems, pumps, fans, and HVAC equipment where consistent and reliable operation is paramount. Its 3P+N configuration ensures protection for three-phase motors and their associated neutral conductor, common in many industrial power distribution setups. The 13A rating makes it appropriate for medium-sized motors operating under standard industrial conditions. The device is a critical component in control panels, switchboards, and distribution boards where precise motor protection is a necessity.

Practical System Integration Guidance

Integrating the Siemens 5SN6613-8CN into an industrial control system is straightforward, designed for standard 35mm DIN rail mounting. Ensure proper torque is applied to the screw terminals during wiring to prevent loose connections, which can lead to overheating or failure. For motor circuits, it's crucial to ensure the MCB's rated current and breaking capacity are adequately selected based on the motor's full load current and potential fault levels. Proper upstream and downstream conductor sizing is also essential to comply with electrical codes and ensure the MCB's protective function is not compromised. The device's terminal markings clearly indicate line and load connections, simplifying installation.

Operation and Risk Mitigation

The Siemens 5SN6613-8CN operates by automatically interrupting the circuit when it detects overcurrents (overloads or short circuits) that exceed its calibrated limits, thus preventing damage to the motor and associated wiring. Risk mitigation involves selecting the correct MCB rating for the specific motor load and ensuring that the protective device is correctly installed and maintained. The Type C characteristic minimizes nuisance tripping during normal motor start-up, but users should be aware that prolonged start-up times or frequent cycling could still trigger the breaker. Regular visual inspections of the MCB and its connections can help identify potential issues before they escalate.

Scalability & Long-Term Value

The 5SN6613-8CN integrates seamlessly into Siemens' broader industrial automation ecosystem, offering compatibility with other Siemens protective devices and control components. While MCBs are typically end-point protective devices, their consistent performance and adherence to international standards ensure long-term reliability. For enhanced system monitoring and digital integration, this MCB can be part of a larger SCADA or IIoT setup, allowing for remote monitoring of circuit status if paired with appropriate ancillary equipment or intelligent gateways. This ensures that even standalone protective devices contribute to the overall intelligence and efficiency of modern industrial plants.

Frequently Asked Questions (FAQs)

What is the breaking capacity of the Siemens 5SN6613-8CN?

The Siemens 5SN6613-8CN features a high breaking capacity of 6 kA, essential for motor starting applications. This rating ensures it can safely interrupt fault currents without damage. It provides robust protection against severe short circuits.

This high breaking capacity is critical for industrial environments where fault levels can be significant. It safeguards equipment and personnel from electrical hazards. The 6kA rating is compliant with IEC standards.

Selecting an MCB with adequate breaking capacity prevents catastrophic failures during short-circuit events. It is a key parameter for motor circuit protection. This ensures operational safety and system integrity.

Can the Siemens 5SN6613-8CN be used for general lighting circuits?

While it can technically protect lighting circuits, it's not its primary intended application. Its Type C tripping characteristic is optimized for motor inrush currents. For general lighting, Type B or Type C MCBs are typically used.

Using a Type C breaker for lighting might lead to nuisance tripping from transient surges. This is less common in lighting circuits compared to motor starting. Standard lighting MCBs are often more sensitive to smaller overloads.

For optimal performance and specific circuit requirements, it's best to use MCBs designed for the application. The 5SN6613-8CN is specifically engineered for motor protection. This ensures reliable operation.

What is the correct way to wire the Siemens 5SN6613-8CN?

The 5SN6613-8CN is designed for DIN rail mounting and uses screw terminals for connection. Ensure the incoming power (line) is connected to the upper terminals and outgoing load to the lower terminals. Proper torque must be applied to the screw terminals to ensure a secure connection.

The 3P+N configuration means there are four terminals for power input and four for output. Correctly identify and connect the neutral conductor to its dedicated terminal. Always follow local electrical codes and best practices for wiring.

Before wiring, ensure the main power supply is disconnected to prevent electric shock. Verify the correct conductor size is used for the 13A rating. Consult the product manual for detailed wiring diagrams if needed.