Siemens 5SU9356-8CN06 RCBO for Earth Leakage & Overload Protection 6A 30mA 1P+N D

The Siemens 5SU9356-8CN06 RCBO offers robust protection against earth leakage and overload for single-phase, neutral-carrying circuits, featuring a 6A current rating, 30mA sensitivity, and a Type D tripping characteristic. This compact device ensures reliable safety in a variety of electrical installations, combining the functions of a miniature circuit breaker (MCB) and a residual current device (RCD) into a single, efficient unit. Its primary advantages include space-saving design, enhanced circuit protection, and compliance with stringent international safety standards, making it a preferred choice for commercial and industrial applications requiring dependable fault detection and interruption.

Product Specifications

| Feature                 | Specification                                    |

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

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

| Manufacturer            | Siemens                                          |

| Model Number            | 5SU9356-8CN06                                    |

| Rated Current (In)      | 6 A                                              |

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

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

| Tripping Characteristic | Type D                                           |

| Rated Breaking Capacity (Icn) | 6 kA                                             |

| Rated Voltage (Ue)      | 230 V AC                                         |

| Frequency               | 50/60 Hz                                         |

| Mounting Type           | DIN Rail                                         |

| Terminal Type           | Screw Terminals                                  |

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

| Compliance Standards    | IEC 61009-1, IEC 60898-1, IEC 61540-1            |

Core Features & Market Positioning

The Siemens 5SU9356-8CN06 RCBO distinguishes itself through its high breaking capacity of 6 kA, ensuring it can safely interrupt fault currents in demanding environments. Its Type D tripping characteristic is particularly valuable for applications with high inrush currents, such as those involving motors or transformers, preventing nuisance tripping while still providing essential overload and earth leakage protection. This dual-functionality consolidates protection, reducing panel space and installation complexity compared to using separate MCBs and RCDs. Siemens' reputation for quality and reliability further solidifies the 5SU9356-8CN06's market position as a dependable component for critical electrical safety.

Key Application Scenarios

This RCBO is ideally suited for protecting circuits in residential, commercial, and industrial settings where the risk of electric shock and fire due to earth faults or overloads is a concern. Specific applications include the protection of lighting circuits, socket outlets, and dedicated circuits for appliances with high starting currents, such as pumps, fans, and small motors. Its 30mA sensitivity makes it highly effective for general-purpose protection against indirect contact, ensuring the safety of personnel. The Type D characteristic is beneficial in environments with inductive loads, common in manufacturing facilities and workshops.

Practical System Integration Guidance

Installing the Siemens 5SU9356-8CN06 RCBO follows standard DIN rail mounting procedures. Ensure the main power supply is de-energized before commencing any work. Connect the incoming line conductor to the designated "L" terminal and the neutral conductor to the "N" terminal on the device. The outgoing load conductors for the circuit to be protected are then connected to the corresponding output terminals. Proper wiring and secure terminal connections are crucial for reliable operation and to prevent overheating. The device is designed for straightforward integration into existing distribution boards and control panels, provided they accommodate standard DIN rail components.

Operation and Risk Mitigation

The Siemens 5SU9356-8CN06 RCBO operates by continuously monitoring the current flowing through the live and neutral conductors. If an imbalance occurs, indicating a fault current to earth, the device will trip and disconnect the circuit within milliseconds. Similarly, if the current exceeds the rated limit due to an overload, the integrated MCB function will activate. To reset the device after a trip, first identify and rectify the cause of the fault. Then, move the toggle switch to the "ON" position. Regular testing of the RCD function using its built-in test button (typically labeled "T") is recommended to ensure its continued operational integrity.

Scalability & Long-Term Value

The 5SU9356-8CN06 RCBO integrates seamlessly with other Siemens industrial control and automation components, offering a scalable solution for electrical distribution systems. Its compliance with broad international standards ensures compatibility with a wide range of electrical equipment. While this specific model is designed for single-phase applications, Siemens offers a comprehensive portfolio of protection devices, allowing for system expansion and upgrades to accommodate increasing power demands or more complex protection requirements. This inherent compatibility with the broader Siemens ecosystem contributes to the long-term value and adaptability of installations.

Frequently Asked Questions

What is the main function of the Siemens 5SU9356-8CN06 RCBO?

The Siemens 5SU9356-8CN06 RCBO combines overload and earth leakage protection. It safeguards circuits against overcurrent faults and dangerous residual currents.

This dual protection mechanism prevents fires and protects users from electric shock. It is a vital safety device for modern electrical installations.

The device ensures circuit integrity by automatically disconnecting power when specific fault conditions are detected. This enhances overall system reliability.

How does the Type D tripping characteristic benefit specific applications?

Type D characteristics are designed for high inrush currents. They prevent nuisance tripping with inductive loads like motors.

This makes the 5SU9356-8CN06 ideal for applications involving pumps or transformers. It ensures protection without unnecessary shutdowns.

Circuits with significant starting currents are reliably protected by this specific tripping curve. It balances safety with operational needs.

What is the significance of the 30mA sensitivity rating?

A 30mA sensitivity is crucial for personal protection against indirect contact. It detects small leakage currents that could be dangerous.

This rating ensures rapid disconnection, minimizing the risk of severe electric shock. It meets stringent safety regulations for user safety.

The device trips quickly when leakage current exceeds 30mA, offering a high level of safety. This is a standard for RCD protection globally.

Can the Siemens 5SU9356-8CN06 be used in residential electrical panels?

Yes, the 5SU9356-8CN06 is suitable for residential applications. It provides essential safety for circuits like sockets and lighting.

Its compact size and DIN rail mounting simplify integration into standard residential distribution boards. It enhances safety against electrical hazards.

The device offers reliable protection against overload and earth leakage, crucial for household electrical safety. It complies with relevant residential standards.

What is the breaking capacity of this RCBO?

The RCBO has a rated breaking capacity (Icn) of 6 kA. This indicates its ability to safely interrupt fault currents.

A 6 kA breaking capacity is sufficient for most common residential and light industrial installations. It provides robust protection against short circuits.

This level of breaking capacity ensures the device can handle fault conditions without sustaining damage. It maintains system safety during severe electrical events.

What are the implications of using a 1P+N (1 Pole + Neutral) device?

A 1P+N device protects both the live and neutral conductors. This ensures complete circuit isolation during a fault.

It is designed for single-phase circuits where neutral connection is required for operation. It combines MCB and RCD functions in one unit.

Using a 1P+N unit saves space in the distribution board compared to separate devices. It simplifies wiring and installation.

How do I reset the Siemens 5SU9356-8CN06 after it trips?

First, identify and eliminate the cause of the tripping. This could be an overload or an earth leakage fault.

Once the fault is resolved, simply flip the toggle switch to the "ON" position. Ensure all connections are secure.

Regularly test the RCBO's functionality using its built-in test button. This confirms the residual current protection is operational.

What are the typical installation requirements for this RCBO?

The device is designed for mounting on a standard 35mm DIN rail. Ensure secure attachment for proper function.

Incoming live and neutral conductors connect to the top terminals, and outgoing load conductors to the bottom. Follow the terminal markings carefully.

Always ensure power is disconnected before installation to prevent electrical shock. Consult a qualified electrician if unsure.

Is this RCBO compatible with other Siemens protection devices?

Yes, the 5SU9356-8CN06 is designed for compatibility within Siemens' electrical distribution systems. It integrates well with their product lines.

It adheres to international standards, ensuring interoperability with devices from other manufacturers as well. Check specific product datasheets for detailed compatibility.

Siemens offers a wide range of complementary products for comprehensive electrical protection and control. This allows for scalable system design.

What is the operating temperature range for this product?

The Siemens 5SU9356-8CN06 operates within an ambient temperature range of -25 °C to +45 °C. This covers most standard operating environments.

Maintaining the device within this specified temperature range is crucial for its longevity and reliable performance. Avoid installation in extreme heat or cold.

Deviations from the specified operating temperatures can affect the tripping characteristics and lifespan of the RCBO. Proper ventilation is recommended.