Siemens 5SU9156-7KK06 RCCB Earth Leakage Protection Switch 6A 10mA 1P+N C

The Siemens 5SU9156-7KK06 is a robust and reliable Residual Current Circuit Breaker with Overcurrent protection (RCBO) designed for advanced electrical safety in low-voltage distribution systems. This 1-pole + Neutral (1P+N) device offers essential protection against earth leakage, overload, and short circuits, ensuring personnel safety and safeguarding equipment. With a rated current of 6A and a sensitive earth leakage detection of 10mA, the 5SU9156-7KK06 is a critical component for preventing electrical shocks and mitigating fire hazards. Its tripping characteristic is C, suitable for circuits with moderate inrush currents, and it boasts a breaking capacity of 6 kA according to EN 61009-1, and 10 kA according to IEC 60947-2. This RCBO operates at a supply voltage of 230/240V AC and features an IP20 protection class when installed within a distribution board. The Siemens 5SU1 series, to which this product belongs, is recognized for its compact design and efficient space utilization in electrical panels.

Product Specifications

| Specification                  | Value                                                              |

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

| Brand                          | Siemens                                                            |

| Product Designation            | SENTRON RCBO                                                       |

| Model                          | 5SU9156-7KK06                                                      |

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

| Rated Current (In)             | 6 A                                                                |

| Rated Residual Current (IΔn)   | 10 mA                                                              |

| Tripping Characteristic        | C                                                                  |

| Breaking Capacity (Icn)        | 6 kA (acc. to EN 61009-1) / 10 kA (acc. to IEC 60947-2)              |

| Supply Voltage                 | 230/240 V AC                                                       |

| Operating Frequency            | 50/60 Hz                                                           |

| Surge Current Resistance (8/20µs) | 1 kA                                                               |

| Protection Class               | IP20 (when installed)                                              |

| Mechanical Service Life        | 10,000 switching cycles (typical)                                  |

| Ambient Temperature (Operation)| -25 °C to +45 °C                                                   |

| Installation                   | 35mm DIN rail mounting, 2 modular widths (36mm)                    |

| Energy Limitation Class        | 3                                                                  |

| Residual Current Type          | AC and A                                                           |

| Degree of Pollution            | 2                                                                  |

| Overvoltage Category           | III                                                                |

Core Features & Market Positioning

The Siemens 5SU9156-7KK06 RCBO stands out in the market due to its dual functionality, combining residual current protection with overcurrent protection in a single, compact device. This integration saves valuable space in distribution boards, a significant advantage in modern installations where space is often at a premium. Siemens' SENTRON range, to which this RCBO belongs, is renowned for its robust construction, high reliability, and adherence to international safety standards, positioning it as a preferred choice for residential, commercial, and light industrial applications. The device's Type A residual current detection capability ensures it can handle pulsating DC residual currents in addition to sinusoidal AC currents, making it suitable for a wide range of electronic loads. Its high surge current withstand capability of 1 kA also contributes to its reliability in environments prone to voltage fluctuations.

Key Application Scenarios

This Siemens RCBO is ideally suited for applications demanding enhanced safety against electrical hazards. Its 10mA sensitivity makes it particularly effective for additional protection against direct contact in areas with increased risk to personnel, such as workshops or areas with higher electrical equipment density. It is a crucial component in residential buildings for safeguarding circuits in living areas, kitchens, and bathrooms. In commercial settings, it provides essential protection for lighting circuits, power outlets, and sensitive electronic equipment. For light industrial use, the 5SU9156-7KK06 can protect individual machine circuits or auxiliary power supplies where precise earth fault detection is critical. Its C-type tripping characteristic makes it appropriate for circuits with moderate inductive loads or motor starts.

Practical System Integration Guidance

Installation of the Siemens 5SU9156-7KK06 is designed for simplicity and efficiency. The device snaps onto a standard 35mm DIN rail and occupies two modular widths (36mm). Wiring is straightforward, with clear terminal markings for phase and neutral connections. Proper grounding connections are paramount for the correct functioning of the residual current protection. When integrating into existing systems, ensure compatibility with the main distribution board and any upstream protective devices. The operational current derating at higher ambient temperatures should be considered; for instance, at 40°C, the operational current is approximately 5.64A. Always refer to the manufacturer's installation manual for detailed wiring diagrams and safety guidelines.

Operation and Risk Mitigation

The Siemens 5SU9156-7KK06 operates by continuously monitoring the current balance between the phase and neutral conductors. If an imbalance exceeding 10mA occurs, indicating a leakage current to earth, the device rapidly trips, disconnecting both conductors to prevent electric shock and fire hazards. A key operational feature is the clearly visible trip indication on the toggle lever, simplifying fault identification. The integrated TEST button allows for regular functional checks, which are recommended monthly to ensure the device remains operational. Troubleshooting typically involves identifying the fault in the protected circuit that caused the tripping. Resetting the device after a trip requires manual engagement of the toggle lever. In case of repeated tripping without an obvious fault, professional electrical assessment is advised to rule out underlying system issues or device malfunction.

Scalability & Long-Term Value

The Siemens 5SU9156-7KK06 RCBO, being part of the broad Siemens SENTRON portfolio, offers excellent compatibility with other Siemens circuit protection devices and systems. This ensures straightforward integration and expansion of electrical installations. While the RCBO itself is a self-contained unit, its value is enhanced by the availability of a wide range of compatible accessories and complementary devices within the Siemens ecosystem. This allows for future upgrades and the addition of specialized protective functions, such as arc fault detection, by combining it with compatible units like the Siemens 5SM6 AFDD. The robust design and adherence to international standards guarantee a long service life and reliable performance, contributing to the overall long-term value and safety of the electrical system.

Frequently Asked Questions (FAQs)

  What is the primary function of the Siemens 5SU9156-7KK06 RCBO?

    The Siemens 5SU9156-7KK06 RCBO primarily provides protection against earth leakage currents, which can cause electric shock. It also incorporates overcurrent protection, safeguarding circuits from overloads and short circuits. This dual functionality ensures comprehensive safety for both personnel and electrical equipment.

  What types of residual current does the 5SU9156-7KK06 detect?

    This RCBO, being a Type A device, detects sinusoidal AC residual currents and pulsating DC residual currents. This makes it suitable for a wide range of modern electronic devices that may generate these types of fault currents. It offers broader protection than Type AC devices.

  How does the tripping characteristic 'C' affect the application of this RCBO?

    A Type C tripping characteristic indicates that the RCBO is designed to withstand moderate inrush currents. This makes it suitable for circuits with inductive loads, such as those found in small motors or lighting systems, without causing nuisance tripping. It balances sensitivity with tolerance for typical operational surges.

  What is the significance of the 10mA rated residual current?

    The 10mA rated residual current signifies a high level of sensitivity. This low threshold is ideal for providing additional protection against direct contact, significantly reducing the risk of severe electric shock in sensitive areas or where direct contact is more probable. It offers enhanced safety beyond standard fault protection.

  Can the Siemens 5SU9156-7KK06 be used in residential and commercial applications?

    Yes, this RCBO is highly suitable for both residential and commercial applications. Its compact size, dual protection capabilities, and compliance with safety standards make it an excellent choice for distribution boards in homes, offices, and retail spaces, ensuring reliable circuit protection.

  What is the breaking capacity of this RCBO?

    The Siemens 5SU9156-7KK06 has a breaking capacity of 6 kA according to EN 61009-1 and 10 kA according to IEC 60947-2. This indicates its ability to safely interrupt fault currents up to these levels, preventing damage to the equipment and the electrical installation during short-circuit events.

  How is the Siemens 5SU9156-7KK06 installed?

    Installation is straightforward, as this RCBO is designed for mounting on a standard 35mm DIN rail. It occupies two modular widths (36mm) in a distribution board, allowing for efficient use of space. Ensure all power is disconnected before attempting installation.

  What is the operating temperature range for this RCBO?

    The Siemens 5SU9156-7KK06 is designed to operate within an ambient temperature range of -25°C to +45°C. Operating outside this range could affect its performance and lifespan. Proper ventilation within the enclosure is also crucial for maintaining optimal operating temperatures.

  Does this RCBO offer protection against arcing faults?

    The standard 5SU9156-7KK06 RCBO itself does not provide protection against arcing faults. For comprehensive protection including arc fault detection, it can be combined with a compatible Siemens Arc Fault Detection Unit (AFDD), such as the 5SM6 AFDD.

  What is the expected service life of the Siemens 5SU9156-7KK06?

    The device has a typical mechanical service life of 10,000 switching cycles. The electrical service life depends on the number and severity of switching operations and fault interruptions. Regular testing with the integrated test button ensures continued operational integrity.