Siemens 5SU9356-1KK63 High Breaking Capacity RCBO 63A 30mA 1P+N C

The Siemens 5SU9356-1KK63 RCBO (Residual Current Circuit Breaker with Overcurrent Protection) is a highly reliable and advanced protective device designed for modern electrical installations. Offering a breaking capacity of 63A, a sensitivity of 30mA, and a 1-pole + neutral configuration with a Type C tripping characteristic, this RCBO provides essential safety against electric shock, fire hazards, and overloads. Its robust design and integration capabilities position it as a critical component for ensuring the integrity and safety of power distribution systems in commercial, industrial, and residential environments.

Product Specifications

| Feature                  | Specification                                |

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

| Product Type             | RCBO (Residual Current Circuit Breaker with Overcurrent Protection) |

| Manufacturer             | Siemens                                      |

| Model Number             | 5SU9356-1KK63                                |

| Rated Current (In)       | 63 A                                         |

| Rated Sensitivity (IΔn)  | 30 mA                                        |

| Number of Poles          | 1P + N (1 Pole + Neutral)                    |

| Tripping Characteristic  | Type C                                       |

| Breaking Capacity (Icn)  | 6 kA (IEC 60898-1), 10 kA (IEC 60947-2)        |

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

| Frequency                | 50/60 Hz                                     |

| Insulation Voltage (Ui)  | 440 V                                        |

| Surge Current           | 3 kA                                         |

| Terminal Type            | Screw Terminals                              |

| Mounting Type            | DIN Rail                                     |

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

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

Core Features & Market Positioning

The Siemens 5SU9356-1KK63 stands out due to its combined overcurrent and earth leakage protection in a single, compact unit. This dual functionality simplifies panel building and reduces installation time and cost compared to using separate MCBs and RCDs. Its high breaking capacity (6 kA and 10 kA variants) ensures safe interruption of fault currents, safeguarding equipment and personnel from severe electrical events. The Type C tripping characteristic is ideal for circuits with moderate inductive loads or inrush currents, such as motors or fluorescent lighting, offering enhanced protection without nuisance tripping. Siemens' reputation for quality and reliability further solidifies the 5SU9356-1KK63's market position as a premium, dependable solution for demanding electrical protection needs.

Key Application Scenarios

This RCBO is exceptionally well-suited for protecting circuits in environments where both overcurrent and residual current faults are a concern. Key applications include:

  Commercial Buildings: Protecting lighting circuits, power outlets, and HVAC systems where occupant safety is paramount.  Industrial Facilities: Safeguarding machinery, control panels, and power distribution boards in manufacturing and processing plants, particularly for circuits with inductive loads.  Residential Installations: Ensuring safety for circuits powering appliances, entertainment systems, and sensitive electronics, especially in kitchens, laundry rooms, and garages.  Specialized Environments: Applications requiring enhanced protection against fire risks, such as workshops or areas with potentially flammable materials.

Practical System Integration Guidance

Integrating the Siemens 5SU9356-1KK63 into existing or new electrical panels is straightforward due to its standard DIN rail mounting and compact 1P+N design. The device utilizes screw terminals for secure connections, accommodating a range of conductor sizes. Ensure that the upstream protective device's rating does not exceed the RCBO's current carrying capacity. For optimal performance and safety, it is crucial to connect the neutral conductor to the designated terminal. Always verify wiring integrity before energizing the circuit. The clear indication of ON/OFF status and tripping events simplifies operational checks.

Operation and Risk Mitigation

The 5SU9356-1KK63 operates by monitoring both the current flowing through the live and neutral conductors and the current flowing to earth. If an imbalance exceeding 30mA is detected (indicating a potential earth leakage fault) or if an overcurrent fault occurs, the device will trip, immediately disconnecting the power supply. This rapid interruption significantly reduces the risk of electric shock, burns, and fires. In the event of a trip, identifying the cause (e.g., faulty appliance, insulation breakdown, or overload) is the first step in troubleshooting. Resetting the RCBO involves simply lifting the toggle switch. Persistent tripping indicates a persistent fault condition that requires professional investigation and resolution.

Scalability & Long-Term Value

As part of Siemens' extensive range of low-voltage switchgear, the 5SU9356-1KK63 offers excellent compatibility with other Siemens circuit breakers, fuses, and distribution boards. This ensures seamless integration into larger systems and facilitates future upgrades or expansions. While this specific model offers a fixed set of protection parameters, its robust construction and adherence to international standards (IEC) guarantee long-term operational reliability and performance. The inherent safety it provides contributes to the overall longevity and reduced risk of damage to connected equipment, thereby offering significant long-term value.

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Frequently Asked Questions

1. What is the primary function of a Siemens 5SU9356-1KK63 RCBO?

This RCBO provides combined protection against overcurrents and residual currents. It safeguards circuits from overloads and short circuits. It also protects individuals from dangerous electric shocks caused by earth faults.

2. What does "63A 30mA 1P+N C" mean for this Siemens RCBO?

"63A" is the rated current capacity, meaning it can handle up to 63 amps. "30mA" is the residual current sensitivity; it trips when 30 milliamperes leak to earth. "1P+N" indicates it protects one live pole and the neutral. "C" describes its tripping characteristic for overcurrents.

3. Is the Siemens 5SU9356-1KK63 suitable for domestic or industrial use?

It is versatile and suitable for both. Its high breaking capacity and reliable protection make it ideal for industrial settings. For domestic use, it offers enhanced safety for circuits with higher demands or potential risks.

4. How does the "Type C" tripping characteristic benefit my electrical system?

Type C is designed for circuits with moderate inrush currents. This includes equipment like motors, fluorescent lighting ballasts, and transformers. It prevents nuisance tripping, offering reliable protection without unnecessary interruptions.

5. What is the breaking capacity of the Siemens 5SU9356-1KK63?

The breaking capacity is 6 kA according to IEC 60898-1. For higher fault level situations, it has a breaking capacity of 10 kA as per IEC 60947-2. This ensures it can safely interrupt fault currents.

6. How do I correctly install the Siemens 5SU9356-1KK63 RCBO?

Mount it on a standard 35mm DIN rail within a suitable enclosure. Connect the incoming live and neutral conductors to the designated terminals. Ensure the load-side wiring is correctly connected. Follow all local electrical codes.

7. What should I do if the Siemens 5SU9356-1KK63 trips unexpectedly?

First, identify the cause of the trip. Check for overloaded circuits or faulty appliances. Inspect wiring for any signs of damage or insulation breakdown. Reset the device by lifting the toggle switch after resolving the issue.

8. Can the Siemens 5SU9356-1KK63 be used in combination with other Siemens protective devices?

Yes, it integrates seamlessly with other Siemens low-voltage switchgear. It is designed to be compatible with Siemens distribution boards and modular components. This allows for comprehensive system design.

9. What are the environmental operating conditions for this RCBO?

The device operates reliably within an ambient temperature range of -25°C to +45°C. It is designed for indoor use and has an enclosure protection rating of IP20. Ensure proper ventilation in the installation site.

10. What are the benefits of using a combined RCBO like the 5SU9356-1KK63 over separate devices?

A combined RCBO saves panel space and reduces installation time. It offers a more compact and cost-effective solution for providing both overcurrent and earth leakage protection. This simplifies wiring and maintenance.