Siemens 5SV3344-6 Miniature Circuit Breaker 4P 40A 30mA

The Siemens 5SV3344-6 Miniature Circuit Breaker (MCB) is a robust, four-pole, 40A, 30mA residual current device designed for reliable protection in demanding industrial and commercial environments. This MCB offers superior protection against overcurrents, short circuits, and earth faults, ensuring the safety of personnel and equipment. Its high breaking capacity and sensitive tripping characteristics make it an ideal choice for safeguarding critical electrical installations.

Product Specifications

| Feature             | Specification                                   |

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

| Product Type        | Miniature Circuit Breaker (MCB)                 |

| Pole Configuration  | 4-Pole                                          |

| Rated Current (In)  | 40 A                                            |

| Rated Residual Current (IΔn) | 30 mA                                           |

| Rated Voltage (Un)  | 400 V AC                                        |

| Breaking Capacity (Icn) | 6 kA                                            |

| Tripping Curve      | Type A                                          |

| Frequency           | 50/60 Hz                                        |

| Terminal Type       | Screw Terminal                                  |

| Mounting Type       | DIN Rail (35mm)                                 |

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

| Standards           | IEC/EN 60898-1, IEC/EN 61009-1                  |

| Operating Temperature | -25°C to +55°C                                  |

| Dimensions (W x H x D) | 70 mm x 90 mm x 76 mm                          |

Core Features & Market Positioning

The Siemens 5SV3344-6 stands out due to its Type A tripping characteristic, which provides enhanced protection against both sinusoidal alternating currents and pulsating direct currents, a crucial advantage over simpler Type AC devices in many industrial applications. This MCB is engineered for high reliability and durability, a hallmark of Siemens' commitment to quality in electrical components. Its robust construction ensures consistent performance even under challenging environmental conditions, positioning it as a premium solution for applications where uninterrupted operation and maximum safety are paramount. The 6 kA breaking capacity offers a significant level of protection against severe short-circuit events, safeguarding downstream equipment and preventing cascading failures.

Key Application Scenarios

This Siemens 5SV3344-6 MCB is ideally suited for use in distribution boards and control panels across a wide range of industrial sectors. It excels in protecting sensitive electronic equipment, motor circuits, and general power distribution circuits where a 30mA residual current sensitivity is required to prevent electric shock. Common applications include manufacturing facilities, data centers, commercial buildings, and any environment where compliance with stringent electrical safety regulations is essential. Its four-pole design makes it suitable for systems with three-phase power supply and a neutral conductor, ensuring comprehensive protection for all active conductors.

Practical System Integration Guidance

Integrating the Siemens 5SV3344-6 into existing or new electrical systems is straightforward due to its standard DIN rail mounting and screw terminal connections. Ensure that the incoming and outgoing conductors are correctly sized for the 40A rating and that proper torque is applied to the terminals to guarantee a secure connection. For three-phase applications, connect the three phase conductors to terminals L1, L2, and L3, and the neutral conductor to the designated neutral terminal. Always verify that the circuit breaker is de-energized before commencing any wiring work. For enhanced safety and compliance, it is recommended to follow local electrical codes and standards during installation.

Operation and Risk Mitigation

The Siemens 5SV3344-6 operates by continuously monitoring the current balance between the live and neutral conductors. If an imbalance exceeding 30mA occurs, indicating a potential earth fault or leakage current, the MCB will trip rapidly, disconnecting the circuit. This rapid tripping mechanism is critical for preventing electrical fires and protecting individuals from dangerous electric shock. In the event of a fault, the operating lever will move to the OFF position. To reset the breaker, ensure the fault condition has been cleared, then push the operating lever fully to the ON position, followed by a downward pull to reset. Avoid resetting without identifying and rectifying the fault, as this can lead to repeated nuisance tripping or mask underlying issues.

Scalability & Long-Term Value

The Siemens 5SV3344-6 is part of Siemens' extensive range of modular circuit protection devices, ensuring excellent compatibility with other Siemens components and systems. Its standardized design allows for easy replacement or expansion of protection capabilities within existing panel installations. While this specific model offers robust protection, Siemens provides a comprehensive portfolio of MCBs and residual current devices with higher breaking capacities or specialized tripping curves, enabling future upgrades or tailored solutions as system requirements evolve. Integration with modern building management systems or industrial control platforms is facilitated through compatible accessories and the overall modularity of the Siemens ecosystem.

Frequently Asked Questions

What is the primary function of the Siemens 5SV3344-6 MCB?

The Siemens 5SV3344-6 MCB primarily serves as a residual current device (RCD) combined with overcurrent protection. It detects earth faults with a sensitivity of 30mA to prevent electric shock. It also protects against overloads and short circuits, safeguarding electrical installations from damage.

What type of electrical systems is this MCB designed for?

This MCB is designed for AC power systems, specifically for protecting circuits with a 40A rating. Its four-pole configuration makes it suitable for three-phase systems with a neutral conductor. It is commonly used in industrial, commercial, and residential distribution boards.

How does the 30mA tripping current protect against electric shock?

A 30mA residual current is generally considered the threshold below which most people can withstand contact with live conductors without sustaining serious injury or fatality. When the MCB detects a leakage current of 30mA or more to earth, it quickly interrupts the circuit. This rapid disconnection minimizes the duration of current flow through the body, thus preventing severe harm.

What are the advantages of a Type A tripping curve?

Type A tripping curves offer protection against sinusoidal alternating fault currents and pulsating direct fault currents. This makes the Siemens 5SV3344-6 more versatile than Type AC devices, as it can effectively protect against faults generated by electronic equipment that may produce pulsating DC components. This enhanced detection capability is vital in modern installations.

Can the Siemens 5SV3344-6 be used in DC systems?

No, the Siemens 5SV3344-6 is specifically designed for AC systems and should not be used in DC (Direct Current) applications. Using it in a DC system would render its protective functions ineffective and could lead to hazardous situations. Always ensure the MCB's rating matches the system's current type.

What is the breaking capacity of the 5SV3344-6, and why is it important?

The breaking capacity (Icn) of the Siemens 5SV3344-6 is 6 kA. This indicates the maximum fault current it can safely interrupt without being damaged. A higher breaking capacity is crucial in systems where significant short-circuit currents are possible, ensuring the device can safely clear faults and prevent damage to the electrical infrastructure.

How do I install the Siemens 5SV3344-6 MCB?

Installation requires mounting the MCB onto a standard 35mm DIN rail within a suitable enclosure. Ensure the incoming live and neutral conductors are connected to the appropriate terminals, and outgoing conductors are connected to the load side. Always de-energize the circuit before installation and follow local electrical codes.

What does "4P" signify in the product name?

"4P" stands for four-pole. This means the circuit breaker has four independent switching poles. It is designed to interrupt all four conductors (three phases and one neutral) simultaneously, providing complete isolation for three-phase systems.

What is the environmental operating temperature range for this MCB?

The Siemens 5SV3344-6 MCB can operate reliably within an ambient temperature range of -25°C to +55°C. Operating outside this range can affect performance and potentially lead to premature failure. Ensure adequate ventilation in the installation environment.

Where can I find the detailed technical documentation for this product?

Detailed technical documentation, including full specifications, installation manuals, and compliance certificates, can typically be found on the official Siemens Industry online portal or through authorized Siemens distributors. These resources provide comprehensive data for engineers and installers.