Siemens 5SV4447-0 Earth Leakage RCBO 4P 80A 100mA

The Siemens 5SV4447-0 is a 4-pole, 80A, 100mA Earth Leakage RCBO designed for robust electrical protection. It offers superior safety through rapid detection and interruption of fault currents, preventing electrical shocks and fire hazards. Its key technical parameters include a rated voltage of 400V AC, a rated breaking capacity of 10kA, and Type A sensitivity for detecting AC and pulsating DC residual currents. This device is engineered for demanding industrial and commercial applications requiring high reliability and performance.

Product Specifications

| Specification                 | Value                                |

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

| Product Type                  | Earth Leakage RCBO                   |

| Poles                         | 4P                                   |

| Rated Current (In)            | 80A                                  |

| Rated Residual Operating Current (IΔn) | 100mA                                |

| Rated Voltage (Ue)            | 400V AC                              |

| Rated Frequency               | 50/60 Hz                             |

| Rated Breaking Capacity (Icn) | 10kA                                 |

| Tripping Characteristic       | Type A                               |

| Housing Material              | Thermoset plastic                    |

| Mounting Type                 | DIN rail                             |

| Protection Class              | IP20                                 |

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

| Certifications                | CE, VDE, IEC 61009                   |

Core Features & Market Positioning

The Siemens 5SV4447-0 RCBO stands out in the market due to its comprehensive protection capabilities, combining overcurrent and earth leakage protection in a single, compact unit. This integration simplifies panel design and installation, reducing component count and labor costs. Its Type A residual current sensitivity ensures broad protection against various fault types, including pulsating DC, which is critical in modern installations with electronic equipment. Siemens' reputation for quality and reliability further positions this RCBO as a preferred choice for professionals seeking dependable safety solutions. The device's robust construction and high breaking capacity of 10kA provide resilience against fault currents, ensuring operational continuity and personnel safety in demanding environments.

Key Application Scenarios

This Siemens 4P 80A 100mA RCBO is ideally suited for main distribution boards in industrial facilities, commercial buildings, and complex residential complexes. Its high current rating of 80A makes it suitable for protecting circuits with significant power loads, such as motor control centers, distribution feeders, and machinery power supplies. The 100mA residual current sensitivity is appropriate for main incomer protection and fire protection applications, where preventing persistent leakage currents is paramount. It is frequently specified for use in environments with a higher risk of electrical faults, ensuring compliance with stringent safety regulations and protecting sensitive equipment from damage.

Practical System Integration Guidance

Integrating the Siemens 5SV4447-0 RCBO into existing or new electrical systems is straightforward due to its standard DIN rail mounting and clear terminal markings. For optimal performance, ensure that the incoming live and neutral conductors are connected to the designated terminals, and the outgoing protected circuit conductors are connected to the respective outputs. Proper grounding of the system is essential, and the RCBO should be installed downstream of the main overcurrent protective device if it's not serving as the main incomer. Ensure that the ambient temperature is within the specified operating range (-25 to +45 °C) for reliable tripping. Wiring should adhere to local electrical codes and standards, utilizing appropriate cable sizes for the 80A rating.

Operation and Risk Mitigation

The Siemens 5SV4447-0 RCBO operates by continuously monitoring the balance of current flowing through the live and neutral conductors. If an imbalance exceeding the 100mA threshold occurs, indicating a leakage to earth, the device rapidly trips, interrupting the circuit and preventing electric shock or fire. To mitigate risks, regular testing of the RCBO's functionality using its integrated test button is recommended. In case of nuisance tripping, investigate the protected circuit for underlying issues such as insulation degradation, faulty appliances, or transient surges. Avoid resetting the device without identifying and rectifying the cause of the fault to prevent repeated tripping and potential damage.

Scalability & Long-Term Value

The modular design of Siemens' switchgear allows for the Siemens 5SV4447-0 RCBO to be seamlessly integrated into larger electrical distribution systems. While this specific RCBO is a fixed-rated device, its compatibility with Siemens' broader range of circuit breakers and protection components facilitates future expansions or upgrades of the electrical infrastructure. For applications requiring adaptability, consider systems that incorporate modular RCBOs or residual current devices (RCDs) alongside separate overcurrent protection, offering greater flexibility in adjusting protection levels. The inherent durability and Siemens' commitment to quality ensure a long service life, providing consistent protection and minimizing the total cost of ownership over the system's operational lifespan.

Frequently Asked Questions

What is the main function of the Siemens 5SV4447-0 RCBO?

The primary role of this device is to provide combined overcurrent and earth leakage protection. It safeguards electrical circuits from damage caused by excessive current, such as overloads and short circuits. Simultaneously, it detects small imbalances in current flow, indicative of earth faults, and rapidly disconnects the power to prevent electric shock and fires.

How does the 100mA sensitivity impact its application?

A 100mA residual current sensitivity makes this RCBO suitable for main protection and fire prevention. It is effective in preventing fires caused by persistent earth leakage currents that might not be sufficient to trip a standard overcurrent device. This higher sensitivity is often mandated for specific building types and installations.

What are the advantages of a 4-pole RCBO like the 5SV4447-0?

A 4-pole configuration ensures that all three phases and the neutral conductor are disconnected simultaneously during a fault. This is crucial for protecting three-phase equipment and systems, preventing phase imbalance and ensuring complete isolation. It offers superior protection for motor loads and other three-phase machinery.

Can this RCBO be used for domestic installations?

While primarily designed for industrial and commercial use, a 4-pole 80A 100mA RCBO could be specified for specific high-demand circuits in larger domestic or multi-unit residential buildings. However, for standard household circuits, single or two-pole RCBOs with lower current and residual current ratings are more common.

What types of earth faults does Type A sensitivity detect?

Type A residual current sensitivity means the RCBO can detect both sinusoidal alternating currents (AC) and pulsating DC residual currents. This is important as many modern electronic devices, such as variable speed drives and power supplies, can generate pulsating DC fault currents.

How often should the test button be used?

It is recommended to test the functionality of the RCBO using the test button at regular intervals, typically monthly. This ensures that the internal tripping mechanism is operational and ready to respond to actual fault conditions. Always follow manufacturer guidelines for testing.

What happens if the RCBO trips repeatedly?

Repeated tripping indicates a persistent fault condition within the protected circuit or connected equipment. It is critical to investigate the cause, which could range from faulty appliances to insulation breakdown or transient overvoltages, before resetting the device to prevent further damage or safety hazards.

What is the breaking capacity of the Siemens 5SV4447-0?

The rated breaking capacity (Icn) of this RCBO is 10kA. This means it can safely interrupt fault currents up to 10,000 Amperes without being damaged. This high breaking capacity is essential for ensuring reliable protection in industrial environments where fault currents can be substantial.

What are the environmental operating conditions for this RCBO?

The Siemens 5SV4447-0 is designed to operate reliably within an ambient temperature range of -25 to +45 °C. Proper ventilation and avoiding installation in excessively hot or cold environments are crucial for maintaining its performance and ensuring accurate tripping characteristics.

Is this RCBO compatible with other brands of switchgear?

While DIN rail mounting is a standard, electrical compatibility and safety certifications are specific to manufacturers. For optimal performance and to maintain warranty, it is generally recommended to use components from the same manufacturer (Siemens) within a switchboard.