Siemens 5SV3647-6 Miniature Circuit Breaker (MCB) 4P 80A 300mA

The Siemens 5SV3647-6 Miniature Circuit Breaker (MCB) stands as a robust solution for reliable electrical protection, offering four poles with an 80A current rating and a 300mA residual current sensitivity. This MCB is engineered for demanding industrial environments, providing superior safety and operational continuity. Its key advantages include high breaking capacity, precise tripping characteristics for sensitive fault detection, and durable construction designed for longevity. Core features encompass advanced arc-quenching technology, thermal-magnetic trip units for overcurrent and short-circuit protection, and a clear status indication mechanism. With a rated voltage of 400V AC and a frequency of 50/60 Hz, the 5SV3647-6 is a critical component in safeguarding electrical installations against hazards.

Siemens 5SV3647-6 MCB: Technical Specifications

| Feature                  | Specification                                     |

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

| Product Type             | Miniature Circuit Breaker (MCB)                   |

| Poles                    | 4                                                 |

| Rated Current (In)       | 80A                                               |

| Rated Residual Operating Current (IΔn) | 300mA                                             |

| Rated Voltage (Ue)       | 400V AC                                           |

| Frequency                | 50/60 Hz                                          |

| Tripping Characteristic  | Type C (for inductive loads)                      |

| Breaking Capacity (Icn)  | 6 kA                                              |

| Insulation Voltage (Ui)  | 500V AC                                           |

| Impulse Withstand Voltage (Uimp) | 4kV                                               |

| Terminal Type            | Screw terminals                                   |

| Mounting Type            | DIN rail (35mm)                                   |

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

| Protection Class         | IP20 (device), IP40 (enclosure)                   |

| Certification            | IEC/EN 60898-1, IEC/EN 61009-1, IEC/EN 61009-2-1 |

Core Features & Market Positioning

The Siemens 5SV3647-6 MCB is positioned as a high-performance protective device, excelling in environments requiring stringent safety standards and dependable operation. Its market differentiation lies in Siemens' renowned quality and reliability, ensuring consistent protection across a wide operational spectrum. The 6 kA breaking capacity is suitable for many industrial applications, offering a robust defense against short-circuit events. Furthermore, the 300mA residual current sensitivity is crucial for protecting personnel from dangerous electric shocks, a critical feature in settings where human interaction with electrical systems is frequent. This MCB integrates advanced tripping mechanisms that minimize nuisance tripping while guaranteeing rapid fault clearance, thereby preserving system integrity and reducing downtime.

Key Application Scenarios

This four-pole 80A MCB with a 300mA RCD function is ideally suited for main distribution boards and sub-distribution boards in commercial and industrial facilities. Common applications include protecting circuits in manufacturing plants, workshops, and data centers where reliable power and personnel safety are paramount. It is frequently deployed to safeguard equipment susceptible to earth faults, such as motors, pumps, and heating elements. The 300mA sensitivity makes it an effective device for supplementary protection against electric shock in areas with a higher risk of contact with live parts. Its robust design ensures optimal performance in challenging ambient conditions, common in industrial settings.

Practical System Integration Guidance

Integrating the Siemens 5SV3647-6 MCB into existing electrical systems is straightforward due to its standard DIN rail mounting and familiar terminal configuration. Ensure that the incoming power supply lines are connected to the appropriate terminals, typically marked with "L" for line and "N" for neutral, respecting polarity. The outgoing protected circuits should be connected to the load-side terminals. For proper earth fault protection, the residual current sensing mechanism must be correctly integrated, ensuring all live conductors are passed through the internal sensing coil. It is imperative to verify that the upstream overcurrent protection device (e.g., main switch or fuse) has a rated current at or above 80A and a breaking capacity sufficient for the installation's fault level. Always adhere to local electrical codes and standards during installation.

Operation and Risk Mitigation

The Siemens 5SV3647-6 MCB operates automatically, providing protection against overcurrents (overloads and short circuits) via its thermal-magnetic trip unit, and against earth faults or residual currents exceeding 300mA through its integrated RCD functionality. The toggle lever indicates the breaker's status: "ON" for power availability, "OFF" for manual disconnection or fault trip, and a central "TRIPPED" position signifying a fault event. To reset the breaker after a trip, move the lever fully to the "OFF" position and then back to the "ON" position. Risk mitigation is inherent in its design; however, ensuring correct installation, regular testing of the RCD function (using the integrated test button), and avoiding operation beyond its rated capacity are crucial. Common troubleshooting involves identifying the cause of the trip (overload, short circuit, or earth fault) before resetting.

Scalability & Long-Term Value

The Siemens 5SV3647-6 MCB offers significant long-term value through its compatibility with the broader Siemens industrial electrical portfolio. Its standard form factor allows for easy replacement or addition to existing switchgear assemblies equipped with DIN rail mounting. While not directly upgradeable in terms of its core electrical ratings, its robust construction ensures a long service life, reducing the need for frequent replacements. For facilities moving towards digitalization, this MCB can be part of a larger smart electrical infrastructure, where downstream devices can be monitored and controlled remotely via intelligent meter interfaces and communication gateways, contributing to energy management and predictive maintenance strategies.

Frequently Asked Questions

What is the primary function of the Siemens 5SV3647-6 MCB?

This MCB primarily functions to protect electrical circuits from overcurrents, including overloads and short circuits. It also provides essential protection against residual currents.

Its integrated residual current device (RCD) feature offers crucial safety against dangerous electric shocks. This makes it suitable for sensitive applications requiring enhanced personal protection.

The device ensures operational continuity by rapidly isolating faults, thereby minimizing damage to equipment and preventing widespread power outages.

How does the 300mA sensitivity of the 5SV3647-6 MCB enhance safety?

The 300mA sensitivity detects small but potentially hazardous earth leakage currents. This level is suitable for supplementary protection against electric shock.

It trips rapidly when a leakage current of 300mA or more is detected, disconnecting the power before a person can sustain a serious injury. This is vital in industrial settings.

This feature provides an additional layer of safety beyond standard overcurrent protection, particularly important in areas where insulation may be compromised or accidental contact is possible.

What types of loads is the Siemens 5SV3647-6 MCB suitable for?

The Type C tripping characteristic makes this MCB ideal for inductive loads with moderate inrush currents. This includes motors, transformers, and solenoid coils.

It can be used in main distribution boards and sub-distribution panels in commercial and industrial buildings. Its 80A rating supports significant power distribution needs.

The robust construction and 6kA breaking capacity ensure reliable operation in demanding environments, protecting circuits in factories, workshops, and similar facilities.