Siemens 5SV4444-0 Earth Leakage RCBO 4P 40A 100mA

The Siemens 5SV4444-0 is a robust 4-pole, 40A, 100mA earth leakage RCBO designed for comprehensive overcurrent and residual current protection in demanding industrial and commercial environments. Its primary advantages lie in its high breaking capacity, reliable tripping characteristic, and seamless integration into standard electrical distribution systems. Key technical parameters include a rated voltage of 400V AC, a rated residual operating current of 100mA, and a rated current of 40A. This device is engineered to prevent electrical fires and protect personnel from electric shock by detecting even small leakage currents, a critical feature for ensuring operational safety and compliance.

Product Specifications

| Parameter                  | Value                         |

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

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

| Number of Poles            | 4                             |

| Rated Current (In)         | 40A                           |

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

| Rated Voltage (Un)         | 400V AC                       |

| Frequency                  | 50/60 Hz                      |

| Tripping Characteristic    | Type AC                       |

| Breaking Capacity (Icn)    | 6 kA                          |

| Degree of Protection       | IP20                          |

| Mounting Type              | DIN Rail                      |

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

| Standard                  | IEC/EN 61009                 |

Core Features & Market Positioning

The Siemens 5SV4444-0 distinguishes itself through its high breaking capacity of 6 kA, offering superior protection against short-circuit events compared to many standard residual current devices. Its Type AC tripping characteristic ensures effective detection of sinusoidal AC residual currents, making it suitable for a wide range of applications where inductive and capacitive loads are present. This RCBO is positioned as a reliable, high-performance safety component for industrial electrical installations, providing a dual function of overcurrent and earth leakage protection in a single, compact unit. This integration simplifies panel design and reduces installation time and complexity, a significant advantage in competitive industrial projects. Siemens' reputation for quality and durability further solidifies its market standing for critical safety applications.

Key Application Scenarios

The Siemens 5SV4444-0 RCBO is ideally suited for main distribution boards in commercial buildings, industrial facilities, and manufacturing plants. It is particularly valuable in areas with a higher risk of earth faults, such as in environments with significant machinery, damp conditions, or complex electrical networks. This 4-pole configuration is essential for protecting three-phase circuits, commonly found in industrial motors, pumps, and HVAC systems, ensuring comprehensive safety for both equipment and personnel. Its 100mA residual current sensitivity is often specified for primary protective devices in installations to provide enhanced fire protection and prevent significant leakage currents from flowing.

Practical System Integration Guidance

Integrating the Siemens 5SV4444-0 RCBO into existing or new electrical panels is straightforward due to its standard DIN rail mounting and compact 4-pole design. Proper wiring is crucial; the incoming line conductors (L1, L2, L3, N) must be connected to the top terminals, and the outgoing load conductors to the bottom terminals. Ensure all connections are secure and torqued to the manufacturer's specifications to prevent overheating and ensure reliable operation. For three-phase systems, it's imperative to correctly identify and connect each phase and the neutral conductor. The device's internal mechanism automatically links the overcurrent and residual current detection, simplifying the overall circuit design and installation process.

Operation and Risk Mitigation

The Siemens 5SV4444-0 operates by continuously monitoring the balance of current flowing into and out of a protected circuit. If an imbalance, indicative of a residual current (earth leakage), exceeds the rated sensitivity of 100mA, the RCBO will rapidly trip, interrupting the power supply. This action mitigates the risk of electric shock, electrocution, and arcing faults that can lead to fires. In the event of an overcurrent or short circuit, the integrated thermal and magnetic trip mechanisms will also cause the device to trip, protecting the downstream wiring and connected equipment from damage. Regular testing of the residual current function using the integrated test button is essential to ensure continued operational effectiveness.

Scalability & Long-Term Value

The Siemens 5SV4444-0 RCBO offers excellent long-term value through its robust construction and compatibility with Siemens' broader range of industrial electrical components. While this specific unit provides fixed ratings, Siemens' extensive portfolio allows for system expansion or upgrades using compatible circuit breakers, contactors, and control gear. Its adherence to international standards ensures it can be integrated into diverse electrical infrastructure and supports future retrofits or expansions of electrical distribution systems. The reliability and durability inherent in Siemens products minimize the need for frequent replacements, contributing to lower total cost of ownership over the lifespan of the installation.

Frequently Asked Questions

What is the primary function of a Siemens 5SV4444-0 RCBO?

This RCBO provides combined protection against overcurrents and earth leakages. It safeguards electrical circuits from faults and protects personnel from electric shock.

It acts as a safety device, tripping instantly when it detects dangerous current imbalances or excessive current flow. This dual protection enhances overall electrical system safety and reliability.

The unit is designed for main distribution and critical industrial applications where high levels of safety and fault detection are paramount.

How does the 100mA residual current sensitivity benefit an industrial setting?

A 100mA sensitivity is often used for main protective devices to offer enhanced fire protection. It detects larger leakage currents that might not be immediately hazardous to people but can still cause fires.

This level of sensitivity is typically a requirement in certain industrial installations where the risk of equipment failure leading to persistent leakage is higher. It provides an additional layer of safety beyond personal protection.

By tripping at 100mA, it helps prevent sustained current flow through fault paths, reducing the likelihood of overheating and ignition of surrounding materials.

Can the Siemens 5SV4444-0 be used for single-phase applications?

While this is a 4-pole device, it can be adapted for certain applications requiring a neutral conductor in single-phase circuits. However, it is primarily designed for three-phase systems.

For standard single-phase applications, a 2-pole RCBO is typically more appropriate and cost-effective. Using a 4-pole unit for single-phase is generally not the optimal choice.

Ensure that if used in a single-phase setup, all active conductors are correctly connected and that the neutral connection is handled according to local electrical codes and the product manual.

What is the breaking capacity of this RCBO and why is it important?

The Siemens 5SV4444-0 features a breaking capacity of 6 kA. This signifies the maximum fault current it can safely interrupt without sustaining damage.

A higher breaking capacity is crucial in industrial environments where fault currents can be significantly larger due to the proximity of power sources and robust electrical infrastructure.

This 6 kA rating ensures the device can reliably clear short-circuit faults, preventing extensive damage to the electrical installation and minimizing downtime.

How do I test the functionality of the Siemens 5SV4444-0 RCBO?

Each Siemens 5SV4444-0 RCBO is equipped with a test button, typically labeled 'T' or 'TEST'. Pressing this button simulates an earth leakage fault.

When the test button is pressed, the RCBO should immediately trip, indicating that both the residual current detection and the tripping mechanism are functioning correctly.

It is recommended to perform this test regularly, for example, monthly, to ensure the device remains operational and provides adequate protection at all times.

What are the typical installation requirements for a 4-pole RCBO like the 5SV4444-0?

Installation requires mounting the RCBO securely onto a standard 35mm DIN rail within an electrical enclosure. Proper grounding of the enclosure is also essential.

Wiring involves connecting the incoming phase conductors (L1, L2, L3) and the neutral conductor (N) to the designated top terminals. The outgoing conductors for the protected circuit connect to the bottom terminals.

Ensure that the torque settings for the terminal screws are in accordance with the manufacturer's specifications to guarantee secure connections and prevent overheating.

What type of residual currents does a Type AC RCBO detect?

A Type AC RCBO, like the 5SV4444-0, is designed to detect sinusoidal alternating residual currents. These are typical of many standard AC power applications.

It responds to residual currents that are smooth, periodically fully alternating, and caused by a fault to earth. This covers the most common types of leakage currents.

However, it may not reliably detect pulsating DC residual currents or smooth DC residual currents, which require Type A, B, or F RCDs.

Is this RCBO compatible with other Siemens electrical components?

Yes, the Siemens 5SV4444-0 is part of Siemens' extensive industrial control and distribution portfolio. It is designed to integrate seamlessly with other Siemens components.

This compatibility ensures that it can be used effectively within larger electrical distribution systems and control panels that utilize other Siemens circuit breakers, contactors, and protection relays.

Its adherence to international standards further promotes interoperability with components from different manufacturers, although native integration within the Siemens ecosystem offers optimal performance.

What is the operating temperature range for this RCBO?

The Siemens 5SV4444-0 is rated for operation within an ambient temperature range of -25 to +45 °C. This broad range makes it suitable for many industrial environments.

Exceeding the upper limit of 45 °C can affect the performance and lifespan of the device, potentially leading to nuisance tripping or reduced breaking capacity. Ensure adequate ventilation in enclosures.

Conversely, operating at very low temperatures can also impact performance, though the -25 °C lower limit is generally robust for most standard industrial applications.

What does "4P" signify in the product name Siemens 5SV4444-0?

"4P" stands for 4-pole. This indicates that the RCBO has four distinct current-carrying poles that can be switched simultaneously.

In the context of this RCBO, it means it is designed to protect three-phase circuits (L1, L2, L3) along with the neutral conductor (N). This is standard for three-phase industrial loads.

This 4-pole configuration ensures that all conductors of a three-phase circuit are disconnected when a fault occurs, providing complete isolation and protection.