Siemens 5SU9356-1CN63 RCBO with Earth Leakage & Overcurrent Protection 63A 30mA 1P+N C

The Siemens 5SU9356-1CN63 RCBO provides robust and reliable protection against earth leakage and overcurrent faults, essential for safeguarding electrical installations and personnel. This compact 1-pole + neutral device offers a 63A rated current and a sensitive 30mA leakage tripping current, making it a crucial component for safety in commercial, industrial, and residential environments. Its C-curve tripping characteristic ensures it can handle moderate inrush currents without nuisance tripping, while its integrated earth leakage protection eliminates the need for a separate RCD, simplifying installation and reducing panel space.

Product Specifications

| Feature                     | Specification                                  |

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

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

| Manufacturer                | Siemens                                        |

| Model Number                | 5SU9356-1CN63                                  |

| Rated Current (In)          | 63 A                                           |

| Rated Residual Operating Current (IΔn) | 30 mA                                          |

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

| Tripping Characteristic     | Type C                                         |

| Rated Breaking Capacity (Icn) | 6 kA                                           |

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

| Frequency                   | 50/60 Hz                                       |

| Terminal Type               | Screw Terminals                                |

| Mounting Type               | DIN Rail (35mm)                                |

| Protection Class            | IP20 (enclosure), IP40 (with cover)            |

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

| Compliance Standards        | IEC/EN 61009-1, IEC/EN 60898-1, IEC/EN 60947-2 |

Core Features & Market Positioning

The Siemens 5SU9356-1CN63 stands out due to its advanced integrated protection, combining the functions of a miniature circuit breaker (MCB) and a residual current device (RCD) into a single, highly efficient unit. This integration not only streamlines electrical panel design by saving space but also simplifies wiring, leading to faster and more cost-effective installations. Its C-curve tripping characteristic is particularly advantageous in applications with higher starting currents, such as motors and transformers, offering enhanced operational reliability by preventing unnecessary shutdowns. Siemens' reputation for quality and durability further solidifies the 5SU9356-1CN63's position as a premium choice for professionals demanding dependable safety and performance.

Key Application Scenarios

This RCBO is ideally suited for a wide array of applications where comprehensive protection against earth faults and overloads is paramount. In residential settings, it ensures the safety of circuits supplying lighting, power outlets, and fixed appliances. For commercial buildings, it's a vital component for protecting distribution boards in offices, retail spaces, and common areas, mitigating risks associated with electrical faults. In industrial environments, the 5SU9356-1CN63 is employed in machine control circuits, power distribution for equipment, and general building services, offering robust protection against both overcurrents and dangerous earth leakages, thereby preventing fires and electric shocks. Its 63A rating makes it suitable for higher load circuits, while the 30mA sensitivity is standard for personnel protection.

Practical System Integration Guidance

Integrating the Siemens 5SU9356-1CN63 RCBO into existing or new electrical systems is straightforward. It mounts directly onto a standard 35mm DIN rail, facilitating quick and secure installation within distribution boards or enclosures. Wiring involves connecting the line conductor to the designated input terminal and the neutral conductor to its corresponding terminal. The outgoing load connections for phase and neutral are then made to the output terminals. Ensure that the incoming supply voltage is within the rated limits of 230/400V AC. Proper earthing of the entire installation is critical, as the RCBO relies on an effective earth path to detect leakage currents. For systems requiring coordinated protection, consult manufacturer guidelines on selectivity with upstream protective devices.

Operation and Risk Mitigation

The Siemens 5SU9356-1CN63 operates by continuously monitoring the balance of current flowing in the phase and neutral conductors. If an imbalance exceeding 30mA occurs, indicative of current leaking to earth, the RCBO rapidly trips, disconnecting the circuit and preventing potential hazards such as electric shock or fire. The C-curve characteristic allows for inrush currents up to 5-10 times the rated current for short durations without tripping, accommodating inductive loads. In the event of an overload or short circuit, the overcurrent protection element within the RCBO trips accordingly. To mitigate risks, always ensure correct wiring, appropriate conductor sizing, and regular testing of the RCBO's functionality by activating the test button. Faults indicated by tripping should be investigated thoroughly before resetting the device.

Scalability & Long-Term Value

The Siemens 5SU9356-1CN63 RCBO is designed for seamless integration within Siemens' extensive range of electrical components, ensuring compatibility with other circuit breakers, RCDs, and distribution board accessories. This inherent compatibility facilitates system expansion and upgrades, allowing for the addition of more circuits or enhanced protection levels without requiring a complete overhaul of the existing infrastructure. While not directly an IIoT device, its reliable performance contributes to the overall stability and safety of an electrical system that may be integrated into broader smart building or industrial automation platforms. Its robust construction and adherence to international standards guarantee a long service life and consistent performance, delivering enduring value.

Frequently Asked Questions (FAQs)

What is the primary function of the Siemens 5SU9356-1CN63 RCBO?

The Siemens 5SU9356-1CN63 RCBO provides combined protection against earth leakage and overcurrent faults in electrical circuits. It acts as both a miniature circuit breaker (MCB) and a residual current device (RCD). This dual functionality enhances safety by preventing electric shock and fire hazards.

How does the 30mA leakage current rating benefit an electrical installation?

A 30mA residual current rating is crucial for personnel protection against dangerous electric shocks. If current leaks to earth exceeding 30mA, the RCBO trips almost instantaneously. This sensitivity helps prevent severe injuries or fatalities in case of insulation failure or contact with live parts.

What does the 'C' curve tripping characteristic mean for the 5SU9356-1CN63?

The 'C' curve signifies that the RCBO is designed to tolerate moderate inrush currents, typically from inductive loads like motors and transformers. It will trip between 5 to 10 times its rated current for short durations. This prevents nuisance tripping in applications with normal starting surges.

Can the Siemens 5SU9356-1CN63 be used for both residential and industrial applications?

Yes, this RCBO is versatile and suitable for various applications. Its robust design and combined protection features make it ideal for safeguarding circuits in homes, commercial buildings, and industrial facilities. It offers reliable protection for diverse load types.

What is the significance of the 63A rated current for this RCBO?

The 63A rated current indicates the maximum continuous current the RCBO can safely handle without tripping due to overload. This rating makes it suitable for main distribution circuits or circuits supplying significant electrical loads, such as those in larger homes or light industrial settings.

How do I properly install the Siemens 5SU9356-1CN63 RCBO?

Install the RCBO on a standard 35mm DIN rail in a suitable enclosure. Connect the incoming line conductor to the 'L' input terminal and the neutral conductor to the 'N' input terminal. The outgoing load conductors are connected to the corresponding output terminals. Ensure correct polarity and secure connections.

What happens if the RCBO trips unexpectedly?

If the RCBO trips, it indicates an earth leakage fault, overload, or short circuit. First, identify the cause by inspecting connected appliances and wiring. Press the reset button to restore power, but if it trips again, a fault persists and requires professional investigation to ensure safety.

Is it necessary to test the functionality of this RCBO regularly?

Yes, regular testing is highly recommended to ensure the RCBO's earth leakage protection is functioning correctly. Most RCBOs, including this Siemens model, feature a test button (often labeled 'T' or 'TEST'). Pressing this button should cause the RCBO to trip, simulating a fault condition.

What are the dimensions and physical characteristics of the Siemens 5SU9356-1CN63?

This RCBO occupies two standard modular widths (approximately 36mm) on a DIN rail. It is designed for easy integration into standard electrical distribution boards. Its compact size allows for high component density within panels, saving valuable space.

Where can I find compatible accessories or complementary products for this RCBO?

Siemens offers a comprehensive ecosystem of electrical components. Compatible accessories like busbars, auxiliary switches, and labeling solutions can be found within Siemens' low-voltage product portfolio, often specified for use with their RCBOs and MCBs.