Siemens 5SU9356-1KK06 Compact Earth Leakage Overload Protector RCBO 6A 30mA 1P+N C

The Siemens 5SU9356-1KK06 is a sophisticated compact Residual Current Circuit Breaker with Overcurrent Protection (RCBO), engineered for reliable and efficient electrical safety in demanding industrial and commercial environments. This 6A, 30mA, 1P+N (single-pole plus neutral) unit offers advanced protection against overload, short circuits, and earth leakage faults, ensuring personnel safety and equipment integrity. Its C-type tripping characteristic makes it ideal for circuits with moderate inrush currents, commonly found in lighting, socket outlets, and motor applications. The compact design facilitates space-saving installations within distribution boards, enhancing design flexibility.

Siemens 5SU9356-1KK06: Product Specifications

| Feature                 | Specification                                      |

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

| Product Type            | Compact Earth Leakage Overload Protector (RCBO)    |

| Siemens Series          | 5SU9                                               |

| Rated Current (In)      | 6A                                                 |

| Rated Residual Current  | 30mA                                               |

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

| Tripping Characteristic | Type C                                             |

| Rated Voltage (Un)      | 230/240V AC                                        |

| Breaking Capacity (Icn) | 6kA                                                |

| Frequency               | 50/60Hz                                            |

| Terminal Type           | Screw Terminals                                    |

| Protection Class        | IP20                                               |

| Mounting Type           | DIN Rail (35mm)                                    |

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

| Certifications          | IEC 61009-1, IEC 61009-2-1, CE, UL (specific variants may differ) |

Core Features & Market Positioning

The Siemens 5SU9356-1KK06 distinguishes itself through its integrated overcurrent and earth leakage protection, consolidating two crucial safety functions into a single, space-efficient device. This dual protection mechanism significantly simplifies electrical panel design and reduces installation time compared to using separate circuit breakers and RCDs (Residual Current Devices). Its C-type curve provides robust protection for inductive loads, offering a balance between sensitive fault detection and immunity to nuisance tripping from motor start-ups or transformer energization. Siemens' reputation for robust German engineering ensures high reliability and a long operational lifespan, positioning this RCBO as a premium solution for applications demanding stringent safety standards and dependable performance. The product's compliance with international standards like IEC 61009 further solidifies its market standing as a trusted component for professional electrical installations.

Key Application Scenarios

This RCBO is exceptionally well-suited for protecting circuits in residential, commercial, and light industrial settings where both overcurrent and earth leakage protection are mandatory. Common applications include final circuits for socket outlets, lighting installations, and small to medium-sized motors, particularly where the equipment might experience moderate inrush currents during startup. It is frequently specified for use in distribution boards feeding office spaces, retail environments, and apartment buildings. Electricians and specifiers rely on the 5SU9356-1KK06 for critical applications such as HVAC systems, pumps, and other machinery that require reliable protection against electrical faults without excessive operational interruptions. Its 30mA sensitivity is ideal for personnel protection, safeguarding against electric shock.

Practical System Integration Guidance

Integrating the Siemens 5SU9356-1KK06 RCBO into existing or new electrical systems is straightforward due to its DIN rail mounting and standard terminal configurations. Ensure the incoming power supply (Live and Neutral) is correctly connected to the designated input terminals, observing the 1P+N configuration. The outgoing load conductors should then be connected to the corresponding output terminals. It is imperative to verify that the main switchboard or distribution panel is rated for the 6kA breaking capacity of the RCBO. Correct polarity must be maintained, and all connections should be tightened securely to prevent overheating and ensure optimal electrical contact. The device is designed for straightforward replacement of existing single-pole breakers and RCDs, provided the circuit parameters align.

Operation and Risk Mitigation

The Siemens 5SU9356-1KK06 operates by continuously monitoring the balance of current flowing in the live and neutral conductors. If an imbalance exceeding 30mA occurs, indicative of an earth leakage fault, the RCBO rapidly trips, disconnecting the power supply. Simultaneously, it provides overcurrent protection, tripping and disconnecting the circuit in the case of an overload or short circuit. This dual protection significantly mitigates the risk of electric shock, fire hazards caused by persistent earth faults, and damage to equipment due to overcurrent conditions. Regular testing of the RCBO's functionality using its integrated test button is crucial to ensure ongoing operational integrity and compliance with safety regulations. Users should consult the product manual for specific troubleshooting guidance related to tripping causes.

Scalability & Long-Term Value

While the Siemens 5SU9356-1KK06 is a single-unit solution, its value lies in its compatibility within the broader Siemens electrical infrastructure. It seamlessly integrates into standard modular distribution boards, allowing for easy expansion or modification of protection schemes. For systems requiring higher current ratings or different tripping characteristics, Siemens offers a comprehensive range of RCBOs and associated protective devices that can be incorporated into the same panel designs. Its robust construction and adherence to international standards ensure a long service life, minimizing the need for premature replacement and contributing to the overall long-term value of the electrical installation. Integration with smart metering and energy management systems is possible through complementary devices within Siemens' portfolio, enabling enhanced monitoring and control capabilities.

Frequently Asked Questions (FAQs)

What is the primary function of the Siemens 5SU9356-1KK06 RCBO?

This device combines circuit breaker and residual current device functions. It protects against overloads and short circuits. It also safeguards against dangerous earth leakage currents.

How does the 30mA residual current rating benefit users?

The 30mA sensitivity ensures personnel protection against electric shock. It rapidly disconnects power if current leaks to earth. This significantly reduces the risk of severe injury.

What types of circuits is the Siemens 5SU9356-1KK06 suitable for?

It is ideal for socket outlets and lighting circuits. It also protects small motors and inductive loads. The C-type curve handles moderate inrush currents.

Can this RCBO be used in residential or only industrial applications?

It is versatile and suitable for both. You find it in homes, offices, and light industrial facilities. Its compact design fits standard consumer units.

What does the "C" in C-type tripping characteristic signify?

"C" indicates a moderate overcurrent tripping level. It is designed to withstand higher inrush currents. This prevents nuisance tripping for motors or transformers.

What is the breaking capacity of the 5SU9356-1KK06 RCBO?

This unit has a breaking capacity of 6kA. It can safely interrupt fault currents up to 6000 Amperes. This is sufficient for most standard distribution circuits.

How do I properly install this RCBO in a distribution board?

Mount it on a standard 35mm DIN rail. Connect the line and neutral supply to the input terminals. Connect the load to the output terminals, maintaining correct polarity.

Is it possible to test the functionality of the 5SU9356-1KK06?

Yes, each RCBO features a test button, typically labeled "T". Pressing this button simulates an earth fault. It should immediately trip the device, verifying its operation.

What are the implications of a 1P+N configuration?

This means it protects a single live conductor and the neutral conductor. It offers combined protection for circuits requiring both poles to be switched. It is common in single-phase systems.

Where can I find more detailed technical documentation for this product?

Refer to the official Siemens documentation or product data sheets. These provide comprehensive specifications and installation guidelines. Always use approved Siemens technical literature.