Siemens 5SV3644-6KK12 Residual Current RCBO Module 4P 40A 300mA

The Siemens 5SV3644-6KK12 Residual Current RCBO Module 4P 40A 300mA stands as a robust solution for comprehensive circuit protection in demanding industrial environments. This advanced Residual Current Circuit Breaker with Overcurrent protection (RCBO) offers superior safety and reliability through its integrated design, combining the functions of a residual current device (RCD) and an overcurrent protective device (MCB) into a single, space-saving unit. Its key advantages include enhanced personal protection against electric shock, effective fire prevention due to earth leakage detection, and reliable protection against short circuits and overloads. With a 4-pole configuration, 40A rated current, and a 300mA sensitivity, the 5SV3644-6KK12 is engineered for critical applications where uninterrupted power and maximum safety are paramount.

Product Specifications

| Feature                 | Specification                               |

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

| Product Type            | Residual Current RCBO Module                |

| Manufacturer            | Siemens                                     |

| Model Number            | 5SV3644-6KK12                               |

| Number of Poles         | 4P (Four-Pole)                              |

| Rated Current (In)      | 40A                                         |

| Residual Current (IΔn)  | 300mA                                       |

| Rated Voltage (Un)      | 400V AC                                     |

| Frequency               | 50/60 Hz                                    |

| Breaking Capacity (Icn) | 6 kA                                        |

| Tripping Characteristic | Type AC                                     |

| Mounting Type           | DIN Rail                                    |

| Protection Class        | IP20 (enclosure), IP40 (with cover)         |

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

| Standard               | IEC/EN 61009-1                           |

Core Features & Market Positioning

The Siemens 5SV3644-6KK12 differentiates itself in the market through its high-quality German engineering and Siemens' reputation for reliability and innovation in electrical distribution and protection. Its primary competitive advantage lies in the seamless integration of residual current and overcurrent protection, which significantly simplifies panel design, reduces installation time, and minimizes potential points of failure compared to separate RCD and MCB installations. The Type AC tripping characteristic is standard for many industrial applications, providing detection of sinusoidal AC residual currents. Furthermore, its robust construction and adherence to stringent international standards like IEC/EN 61009-1 underscore its suitability for harsh industrial settings where dependable performance is non-negotiable.

Key Application Scenarios

This Siemens RCBO module is ideally suited for a wide array of industrial power distribution systems. Its 300mA residual current sensitivity makes it particularly effective for primary power distribution circuits where the risk of significant earth faults exists, or where protection against fire is a critical concern. Common application scenarios include protecting main distribution boards in factories, workshops, and commercial buildings, safeguarding power circuits for heavy machinery, and ensuring the safety of personnel in areas with increased risk of electrical hazards. It is also a strong choice for protecting circuits supplying equipment that could cause substantial leakage currents, such as motor control centers or large heating elements, where a 40A rating is appropriate.

Practical System Integration Guidance

Integrating the Siemens 5SV3644-6KK12 into an electrical system is straightforward, leveraging standard DIN rail mounting for quick and secure installation within distribution boards and enclosures. The 4-pole design ensures complete isolation of all three phases and the neutral conductor when tripping occurs, which is crucial for comprehensive safety in three-phase systems. Wiring connections are typically made via screw terminals, designed to accept appropriate conductor sizes for the 40A rating; proper torque must be applied to ensure secure connections and prevent overheating. For system designers, specifying this 4P RCBO in three-phase installations simplifies load balancing considerations and ensures that neutral conductors are also protected and switched in line with the phase conductors, a key safety requirement in many modern electrical codes.

Operation and Risk Mitigation

The 5SV3644-6KK12 operates by continuously monitoring the current balance between the live and neutral conductors. If an imbalance (indicating a residual current, such as one flowing through a person to earth) exceeds the 300mA threshold, the device rapidly trips, disconnecting the circuit and mitigating the risk of electric shock or fire. To mitigate operational risks, regular testing of the RCBO's functionality using its integrated test button is highly recommended, typically on a monthly basis, to ensure the tripping mechanism remains operational. While this RCBO offers robust protection, it's vital to ensure correct installation and wiring; incorrect connections or over-tightening of terminals can lead to operational failures or damage. Fault codes are not typically displayed by this type of mechanical device; instead, a trip indicates a fault condition in the protected circuit or connected equipment that requires investigation.

Scalability & Long-Term Value

The Siemens 5SV3644-6KK12 is designed for straightforward integration into existing Siemens electrical infrastructure and offers excellent compatibility with other components within the Siemens SENTRON protection, switching, measuring, and monitoring devices portfolio. This inherent compatibility ensures that system upgrades or expansions can be seamlessly managed, maintaining a unified and reliable electrical distribution system. While the device itself is not digitally upgradeable, its robust design and adherence to established standards contribute to its long-term value by ensuring consistent performance over its operational lifespan. For enhanced system monitoring and integration with Industrial Internet of Things (IIoT) solutions, adjacent Siemens digital devices or communication gateways can be incorporated into the panel, allowing for remote monitoring of trip events and system status, thereby enhancing operational efficiency and predictive maintenance capabilities.

FAQs

What is the primary function of the Siemens 5SV3644-6KK12 RCBO?

This device offers dual protection against electrical hazards. It safeguards circuits from overloads and short circuits, similar to a standard circuit breaker. Simultaneously, it detects earth leakage currents to prevent electric shock and fires.

It acts as a combined residual current device (RCD) and miniature circuit breaker (MCB). This integration simplifies panel space and installation complexity. Its 40A rating and 300mA sensitivity are key parameters for its protective capabilities.

The primary goal is to enhance personnel safety and prevent equipment damage. It provides comprehensive protection in a single, reliable unit for industrial and commercial applications.

How does the 300mA sensitivity of the 5SV3644-6KK12 RCBO benefit industrial applications?

A 300mA sensitivity is ideal for main distribution circuits and fire protection. It is set higher than personal protection levels to prevent nuisance tripping from minor leakage. This ensures continuity of service for essential loads.

This level of sensitivity is designed to detect significant earth faults that could lead to overheating and fire hazards. It provides a crucial layer of safety for premises and valuable equipment.

While not intended for direct personal protection at this level, it effectively reduces the risk of fires caused by persistent earth leakages. It complements lower sensitivity devices for enhanced overall safety.

What type of circuits is the Siemens 5SV3644-6KK12 4-pole RCBO best suited for?

The 4-pole configuration is specifically designed for three-phase power systems. It ensures all three live conductors and the neutral conductor are simultaneously switched and protected. This is vital for balanced three-phase loads.

It is highly recommended for main incomer protection in industrial facilities. It also serves well for circuits supplying motors, heavy machinery, or any significant three-phase equipment.

The 40A rating indicates its capacity to handle substantial power loads. Its residual current protection adds a critical safety layer to these high-power applications.