Siemens 5SV3344-4 Double Pole Miniature Circuit Breaker 4P 40A 30mA

The Siemens 5SV3344-4 is a high-performance double-pole miniature circuit breaker (MCB) designed for robust electrical protection in demanding industrial and commercial environments. This 4-pole, 40A, 30mA RCD (Residual Current Device) integrated MCB offers superior safety and reliability, safeguarding personnel and equipment from overcurrents and earth leakage faults. Its advanced tripping characteristics and compact design make it an ideal choice for critical power distribution applications, ensuring compliance with stringent safety standards and operational continuity.

Product Specifications

| Feature                 | Specification                                 |

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

| Product Type            | Miniature Circuit Breaker (MCB) with RCD      |

| Manufacturer            | Siemens                                       |

| Model                   | 5SV3344-4                                     |

| Pole Configuration      | 4-Pole (Double Pole Switching)                |

| Rated Current (In)      | 40A                                           |

| Rated Residual Current  | 30mA                                          |

| Tripping Type           | Type AC (for residual alternating currents) |

| Breaking Capacity (Icn) | 6 kA                                          |

| Voltage Rating          | 400V AC                                       |

| Frequency               | 50/60 Hz                                      |

| Mounting Type           | DIN Rail                                      |

| Insulation Voltage (Ui) | 500V                                          |

| Degree of Protection    | IP20 (main circuit), IP40 (enclosure)         |

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

| Standard               | IEC/EN 61009-1 |

Core Features & Market Positioning

The Siemens 5SV3344-4 distinguishes itself through its integrated residual current protection, offering a dual-function device that simplifies installations and enhances safety. This 4-pole configuration provides comprehensive protection for three-phase circuits, ensuring all live conductors are disconnected simultaneously in the event of a fault. Its 40A rating makes it suitable for medium to heavy load applications, while the 30mA sensitivity of the RCD component is critical for personnel protection against electric shock. Siemens' reputation for quality and reliability in circuit protection solidifies the 5SV3344-4's position as a trusted component in professional electrical systems, outperforming single-function breakers in safety and space-saving benefits.

Key Application Scenarios

This MCB is exceptionally well-suited for protecting circuits in demanding environments such as industrial machinery, control panels, and commercial building distribution boards. Its application is crucial in areas where personnel are in close proximity to electrical equipment, such as manufacturing floors, workshops, and areas with higher humidity or conductive dust. The 4-pole design is particularly beneficial for three-phase motor circuits and other balanced three-phase loads, ensuring complete isolation during fault conditions. Common search queries related to its use include "3-phase residual current protection," "industrial circuit breaker for motors," and "Siemens 40A MCB 30mA installation."

Practical System Integration Guidance

Integrating the Siemens 5SV3344-4 into an electrical system is straightforward due to its standard DIN rail mounting and conventional terminal design. Ensure the main power supply is de-energized before installation. Connect the incoming phase and neutral conductors to the designated line terminals and the outgoing load conductors to the corresponding load terminals. For a 4-pole unit, all three phases and the neutral (if applicable to the circuit being protected) are connected. The RCD function is inherent to the device and requires no separate wiring. Proper torque must be applied to the terminals to ensure secure connections and prevent overheating. Verify correct wiring before re-energizing the circuit.

Operation and Risk Mitigation

The Siemens 5SV3344-4 operates by continuously monitoring the current balance between the live and neutral conductors. If an imbalance exceeding 30mA occurs, indicating a leakage current to earth, the RCD integrated within the MCB will rapidly trip, disconnecting the circuit. This significantly reduces the risk of electric shock and fire hazards. In the event of an overcurrent due to a short circuit or overload, the thermal or magnetic tripping mechanism of the MCB will activate, providing overcurrent protection. Regular testing of the RCD function using the integrated test button is crucial for ensuring its operational readiness and mitigating risks associated with electrical faults.

Scalability & Long-Term Value

The Siemens 5SV3344-4, as part of Siemens' extensive range of circuit protection devices, offers excellent compatibility with other Siemens components and broader electrical infrastructure. While this specific model is a fixed-rated device, its robust construction and adherence to international standards ensure long-term reliability and performance. Its integration into standard distribution boards allows for straightforward replacement or expansion within existing Siemens electrical systems. For future-proofing, its reliable performance contributes to system stability, reducing downtime and associated costs, a key aspect of long-term value in industrial applications.

FAQs

What is the breaking capacity of the Siemens 5SV3344-4?

The Siemens 5SV3344-4 features a breaking capacity of 6 kA. This rating indicates its ability to safely interrupt fault currents up to 6,000 Amperes. It is designed to handle the high levels of current encountered during short-circuit events.

This robust breaking capacity ensures the device can protect downstream equipment and wiring from severe damage. It meets the requirements for many standard industrial and commercial power distribution systems.

The 6 kA rating provides a high level of safety for applications where higher fault currents might be anticipated. It is crucial to ensure this rating is appropriate for the specific installation's prospective fault current.

How does the RCD function of the Siemens 5SV3344-4 protect against electric shock?

The integrated 30mA RCD continuously monitors current flow. It detects even small imbalances between live and neutral conductors. Such imbalances often indicate current leaking to earth through a person.

When a leakage current of 30mA or more is detected, the RCD trips very quickly. This rapid disconnection interrupts the power supply before a dangerous electric shock can occur. It significantly enhances safety for personnel.

This residual current protection is vital for circuits supplying power to areas where people might come into contact with electrical equipment. It provides an essential layer of personal safety beyond standard overcurrent protection.

What type of residual current does the Siemens 5SV3344-4 respond to?

The Siemens 5SV3344-4 is designed as a Type AC RCD. This means it is sensitive to residual alternating currents. These are the most common type of residual currents encountered in typical AC power systems.

It effectively detects sinusoidal AC leakage currents resulting from insulation faults. However, it may not detect pulsating DC residual currents. For such specific applications, other RCD types (like Type A or Type B) would be necessary.

When selecting an RCD, understanding the potential fault current characteristics of the protected circuit is essential. Type AC is suitable for general-purpose AC applications where DC leakage is not a concern.