Siemens 5SU9356-2CN10 RCBO Earth Leakage Protection 10A 30mA 1P+N D

The Siemens 5SU9356-2CN10 RCBO is a crucial component for safeguarding electrical installations against overcurrents and earth leakages. This 10A, 30mA, 1-pole + neutral device combines the functions of a miniature circuit breaker (MCB) and a residual current device (RCD) into a single, space-saving unit. Its primary advantages lie in its enhanced safety features, compliance with stringent international standards, and reliable performance in demanding industrial environments. Key technical parameters include a rated current of 10A, a residual current sensitivity of 30mA, and a breaking capacity suitable for standard residential and commercial applications. The Type D tripping characteristic ensures it can handle moderate inrush currents without nuisance tripping, making it ideal for circuits with inductive loads.

Product Specifications

| Parameter              | Specification                                     |

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

| Product Type           | RCBO (Residual Current Operated Circuit Breaker)  |

| Manufacturer           | Siemens                                           |

| Model Number           | 5SU9356-2CN10                                     |

| Rated Current (In)     | 10A                                               |

| Residual Current (IΔn) | 30mA                                              |

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

| Tripping Characteristic| Type D                                            |

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

| Rated Breaking Capacity| 6kA                                               |

| Frequency              | 50/60 Hz                                          |

| Protection Type        | Overcurrent, Short Circuit, Earth Leakage         |

| Mounting Type          | DIN Rail                                          |

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

Core Features & Market Positioning

The Siemens 5SU9356-2CN10 RCBO stands out in the market due to its integrated design, which significantly simplifies panel construction and reduces installation time. By combining MCB and RCD functionalities, it minimizes the need for separate devices, leading to cost savings and a more compact footprint. This product is positioned as a high-reliability solution for essential circuit protection, especially in applications where personnel safety and equipment integrity are paramount. Its Type D characteristic offers a distinct advantage over Type B or C devices for circuits with specific inductive loads, preventing unnecessary shutdowns. This differentiates it in sectors requiring robust protection without compromising operational continuity.

Key Application Scenarios

This RCBO is exceptionally well-suited for protecting circuits in residential, commercial, and light industrial settings. Common applications include safeguarding lighting and socket outlet circuits, ensuring safety in areas with increased risk of electric shock such as kitchens and bathrooms, and protecting circuits feeding inductive loads like small motors, transformers, and fluorescent lighting ballasts that exhibit higher initial current draws. Its 30mA sensitivity is the standard for general-purpose protection against indirect contact, providing essential safety for occupants. The 10A rating makes it appropriate for circuits with moderate power demands.

Practical System Integration Guidance

Integrating the Siemens 5SU9356-2CN10 RCBO into existing electrical systems is straightforward due to its standard DIN rail mounting and conventional wiring configuration. Ensure the incoming power supply is correctly terminated at the line terminals, and outgoing circuit conductors are connected to the load terminals. The neutral conductor must also be connected to its designated terminal. It is crucial to verify the correct phase and neutral connections to ensure the RCD function operates effectively. For optimal system integrity, it should be installed downstream of the main incomer or distribution board, protecting specific circuits requiring earth leakage and overcurrent protection. Always ensure the circuit's total connected load does not exceed the 10A rating of the device.

Operation and Risk Mitigation

The primary function of the 5SU9356-2CN10 RCBO is to detect earth faults (residual currents) and overcurrent conditions (overloads and short circuits), then rapidly interrupt the circuit to prevent electrical hazards. In the event of an earth leakage current exceeding 30mA, the RCD function trips, disconnecting the power. Similarly, if the current exceeds the 10A overload or short-circuit threshold, the MCB function activates. Regular testing of the RCD function using the integrated test button (typically labeled 'T') is essential to ensure its continued operational integrity. Failure to test periodically can lead to a false sense of security, as the device may not function correctly when a fault occurs. Always consult the manufacturer's manual for specific operational details and troubleshooting guidance.

Scalability & Long-Term Value

The Siemens 5SU9356-2CN10 RCBO offers robust protection within its specified parameters and fits within the widely adopted Siemens low-voltage distribution system architecture. While not directly "scalable" in terms of increasing its own current or sensitivity rating, its value lies in its compatibility with a broad range of Siemens circuit breakers and related protective devices. This ensures that as electrical systems evolve, this RCBO can be seamlessly integrated into larger Siemens electrical panels and distribution boards. For IIoT integration, while this specific model may not have direct digital communication capabilities, its reliable performance contributes to the overall stability of an electrical system that can be monitored and managed through smart metering and higher-level control systems, indirectly supporting digital transformation efforts by ensuring a stable power supply to connected equipment.

Frequently Asked Questions

1. What is the primary function of the Siemens 5SU9356-2CN10 RCBO?

This device protects against earth leakages and overcurrents. It combines MCB and RCD features for comprehensive safety.

It ensures personnel safety by quickly disconnecting power during fault conditions. This prevents electric shocks and fires.

The 10A, 30mA, 1P+N rating makes it suitable for specific circuit protection needs.

2. What does the "10A 30mA 1P+N" designation mean on this RCBO?

"10A" refers to the maximum continuous current the device can handle. "30mA" is the sensitivity for detecting earth leakage currents.

"1P+N" signifies that it protects one live (phase) conductor and the neutral conductor simultaneously. This is common for single-phase circuits.

This specific rating is suitable for many residential and commercial circuits with moderate power requirements and standard safety needs.

3. Can the Siemens 5SU9356-2CN10 be used for all types of electrical circuits?

It is ideal for single-phase circuits requiring earth leakage and overcurrent protection. Its Type D characteristic is beneficial for inductive loads.

Avoid using it for circuits exceeding its 10A rating or where higher residual current sensitivity is mandated. Always check load calculations.

Verify compliance with local electrical codes and specific site requirements before installation. Ensure compatibility with the overall system design.

4. How do I install the Siemens 5SU9356-2CN10 RCBO?

Mount the RCBO securely onto a standard 35mm DIN rail in a distribution board. Ensure proper orientation for line and load connections.

Connect the incoming live and neutral conductors to the designated line terminals. Connect the outgoing circuit conductors to the load terminals.

Always ensure power is isolated before commencing any installation work. Double-check all connections for tightness and correctness.

5. What is the significance of the "Type D" tripping characteristic?

Type D breakers are designed to tolerate higher inrush currents from inductive loads. This prevents nuisance tripping for motors or transformers.

Compared to Type B or C, Type D offers a wider operating range for initial surge currents. It trips between 10 to 20 times the rated current.

This makes the 5SU9356-2CN10 suitable for circuits feeding equipment with significant starting currents, ensuring operational reliability.

6. How often should I test the residual current protection (RCD) function?

Regular testing is critical to ensure the RCD function remains operational. A monthly test is generally recommended.

Use the integrated test button ("T") on the RCBO to simulate an earth fault and verify tripping. Ensure the circuit is energized during testing.

If the device does not trip during the test, it must be replaced immediately as it is no longer providing adequate earth leakage protection.

7. What are the advantages of using an RCBO over separate MCB and RCD units?

RCBOs offer a more compact solution, saving space within electrical panels. This simplifies wiring and installation.

They provide combined overcurrent and earth leakage protection in a single device. This can reduce material costs and labor time.

The integrated design ensures both protection types are always linked, preventing potential miswiring or incompatibility issues between separate units.

8. What is the breaking capacity (kA) of this RCBO, and why is it important?

The 5SU9356-2CN10 has a breaking capacity of 6kA. This indicates the maximum fault current it can safely interrupt without damage.

A higher breaking capacity is crucial for ensuring the device can safely handle potential short-circuit faults. It protects downstream equipment and prevents arc flash hazards.

Ensure the breaking capacity is adequate for the fault current level at the installation point, as specified by electrical design standards.

9. Can this RCBO be used in industrial automation systems?

While this specific model is not a smart device, its reliable protection is vital for stable industrial operations. It safeguards critical machinery.

It can be integrated into control panels to protect power supplies for automation components. Its robustness ensures consistent performance.

For advanced IIoT integration, consider systems that monitor the status of such protective devices indirectly or use higher-level Siemens automation components.

10. Where can I find replacement parts or additional technical documentation for the 5SU9356-2CN10?

Consult official Siemens technical documentation and product catalogs for detailed specifications and manuals. These are often available online.

Contact authorized Siemens distributors or electrical wholesalers for purchasing replacement units or compatible accessories. They can also provide guidance.

Always ensure any replacement part is an exact match for the model number to maintain safety and performance standards.