Siemens 5SY6401-7CC Single Phase Sensitive Equipment Circuit Breaker 4P 1A

The Siemens 5SY6401-7CC is a sophisticated 4-pole, 1-ampere sensitive equipment circuit breaker designed for precise protection of critical electrical systems. This breaker distinguishes itself with its high sensitivity, rated for residual currents, ensuring rapid disconnection to prevent damage from earth faults and leakage currents. Its robust construction and adherence to stringent international standards make it a reliable choice for safeguarding sensitive electronics, laboratory equipment, and specialized industrial machinery. Key technical parameters include a rated voltage of 400V AC, a rated residual current (IΔn) of 30mA, and a breaking capacity (Icu) of 6kA, all contributing to its effectiveness in demanding environments.

Product Specifications

| Specification           | Value                               |

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

| Product Type            | Miniature Circuit Breaker (MCB)     |

| Pole Configuration      | 4-Pole                              |

| Rated Current (In)      | 1A                                  |

| Rated Residual Operating Current (IΔn) | 0.03A (30mA)                     |

| Rated Voltage (Un)      | 400V AC                             |

| Rated Short-Circuit Breaking Capacity (Icu) | 6kA                                 |

| Tripping Characteristic | Type A (Sensitive to AC and pulsating DC residual currents) |

| Frequency               | 50/60 Hz                            |

| Housing Material        | High-impact, flame-retardant plastic |

| Terminal Type           | Screw terminals                     |

| Mounting                | DIN rail                            |

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

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

Core Features & Market Positioning

The Siemens 5SY6401-7CC leverages Siemens' extensive experience in protective devices to offer superior earth leakage protection. Its Type A sensitivity is a critical differentiator, providing protection against both AC and pulsating DC residual currents, a requirement for many modern electronic devices that generate such waveforms. This level of protection is paramount in applications where standard Type AC breakers are insufficient, positioning the 5SY6401-7CC as a premium solution for sensitive loads. The 4-pole design ensures complete isolation in three-phase systems when tripping occurs, enhancing safety and compliance. Its robust 6kA breaking capacity ensures it can safely interrupt fault currents, even in relatively high-impedance distribution systems.

Key Application Scenarios

This sensitive equipment circuit breaker is indispensable in scenarios demanding the highest level of protection against earth faults and leakage currents. Common applications include the safeguarding of sensitive laboratory instrumentation, medical equipment where patient safety is paramount, and precision manufacturing machinery. It is also frequently specified for protecting IT infrastructure, server rooms, and telecommunication equipment that are highly susceptible to power disturbances and leakage. In residential and commercial buildings, the Siemens 5SY6401-7CC is an excellent choice for circuits feeding specialized appliances, data networks, or areas with a higher risk of electrical faults involving sensitive electronics. Its 1A rating makes it ideal for low-current, high-sensitivity applications.

Practical System Integration Guidance

Integrating the Siemens 5SY6401-7CC into existing electrical panels is straightforward due to its standard DIN rail mounting. For 4-pole applications, ensure that the supply and load wiring correctly aligns with the designated poles. The breaker is designed for terminating conductors via screw terminals, facilitating secure connections. When wiring three-phase systems, it's crucial to connect the neutral conductor to the designated neutral pole if required by the application and local regulations. For earth leakage protection, the residual current sensing mechanism operates internally, requiring no external components for basic functionality. Always verify that the system's prospective fault current does not exceed the breaker's 6kA breaking capacity. Proper grounding of all connected equipment is, of course, fundamental for the effective operation of any residual current device.

Operation and Risk Mitigation

The Siemens 5SY6401-7CC operates by continuously monitoring the balance of current flowing through the live and neutral conductors. Should a significant imbalance occur, indicative of current flowing to earth via an unintended path (e.g., through a person or faulty insulation), the breaker rapidly trips, interrupting the circuit. This sensitive detection minimizes the risk of electric shock and prevents equipment damage caused by sustained earth faults. In the event of a fault, the breaker will visibly indicate its tripped status. Resetting the breaker is done by simply flipping the toggle switch back to the "ON" position after the fault condition has been rectified. It is critical to address the root cause of any trip; repeated tripping without identifying the source indicates a persistent electrical issue that requires professional diagnosis to prevent potential hazards.

Scalability & Long-Term Value

The Siemens 5SY6401-7CC circuit breaker offers excellent long-term value due to its robust design and compatibility with the broader Siemens industrial automation ecosystem. While this specific unit is a fixed-rating device, its integration into standard distribution boards allows for straightforward replacement or upgrading of protection levels should application requirements evolve. Siemens' commitment to backward and forward compatibility within its product lines ensures that panels equipped with these breakers can be maintained and expanded with minimal disruption. For businesses investing in digital transformation and the Industrial Internet of Things (IIoT), Siemens offers advanced protection relays and smart circuit breakers that provide remote monitoring and data analytics, which can often be integrated into systems that already incorporate traditional devices like the 5SY6401-7CC, creating a layered approach to electrical safety and operational intelligence.

Frequently Asked Questions

What is the primary function of a Siemens 5SY6401-7CC circuit breaker?

This breaker is designed for sensitive earth leakage and fault current protection. It safeguards equipment and personnel from electrical hazards. Its high sensitivity ensures rapid disconnection.

It is rated for 4 poles and 1 ampere, making it suitable for specific low-current applications. The 30mA residual current rating is critical for enhanced safety.

The 5SY6401-7CC adheres to stringent IEC/EN standards, guaranteeing reliable performance and safety compliance.

How does the Type A tripping characteristic benefit my application?

Type A breakers detect AC and pulsating DC residual currents. This is vital for protecting modern electronic devices. Many sensitive electronics generate such waveforms.

Standard Type AC breakers may not detect pulsating DC faults. This could leave your equipment vulnerable. Type A provides a broader safety net.

Choosing Type A ensures comprehensive protection against a wider range of fault scenarios, enhancing equipment longevity and operational safety.

Can I use the Siemens 5SY6401-7CC in a standard household electrical panel?

Yes, if your application demands 4-pole protection and a 1A rating with 30mA sensitivity. It's ideal for sensitive loads like dedicated server circuits. It can also protect specialized appliances or IT equipment.

Ensure the panel has sufficient space for a 4-pole breaker and a DIN rail for mounting. Consult a qualified electrician for proper installation and code compliance.

While standard household panels often use 2-pole breakers, this 4-pole variant is suitable for specific circuit protection needs within a larger system.

What are the key technical specifications to consider for the 5SY6401-7CC?

Key specs include 4 poles, 1A rated current, and 30mA sensitivity (IΔn). It operates at 400V AC with a 6kA breaking capacity (Icu).

The Type A tripping characteristic is crucial for detecting AC and pulsating DC faults. Its frequency range is 50/60 Hz.

Consider its operating temperature range (-25 to +45 °C) and robust construction for demanding industrial environments.

What type of equipment is best protected by a 1A sensitive circuit breaker?

This breaker is perfect for low-power, high-sensitivity electronics. Think of specific control circuits or communication modules. It's also suited for instrumentation.

Data acquisition systems and sensitive measurement devices benefit greatly from this protection. It prevents minor leaks from causing significant damage.

Its 1A rating is ideal where minimal current draw is expected, but high protection levels are essential for delicate components.

What does a 6kA breaking capacity mean for system safety?

It signifies the maximum fault current the breaker can safely interrupt. A 6kA rating provides robust protection for many standard installations.

Higher breaking capacity offers greater safety margins against severe short circuits. It prevents catastrophic damage to the breaker and system.

Ensure your system's prospective short-circuit current does not exceed 6kA at the installation point. Consult an electrician if unsure.

How do I reset a tripped Siemens 5SY6401-7CC?

First, identify and resolve the cause of the trip. Then, simply flip the toggle switch to the "ON" position. Ensure the fault is completely cleared before resetting.

If the breaker trips repeatedly, do not force it. This indicates an ongoing electrical issue requiring professional diagnosis. Persistent faults can be hazardous.

Always follow safety protocols when resetting any circuit breaker. If in doubt, consult a qualified electrician for assistance.

Is the 5SY6401-7CC compatible with older Siemens electrical components?

Siemens generally ensures good compatibility within their product lines. This breaker uses standard DIN rail mounting. It should integrate with most modern distribution boards.

For specific compatibility with very old systems, consult Siemens' technical documentation or support. Check terminal sizes and wiring standards.

Its adherence to IEC/EN standards aids in broad compatibility across different manufacturers' compliant equipment.

What is the main difference between Type A and Type F residual current circuit breakers?

Type A detects AC and pulsating DC residual currents. It's common for most sensitive electronic equipment. It offers good all-around protection.

Type F additionally detects smoothed DC residual currents. This provides even higher protection for specific industrial applications. It's suited for variable frequency drives (VFDs).

Choosing between Type A and F depends on the specific types of residual currents expected from your connected equipment.

Where can I find the official technical datasheet for the Siemens 5SY6401-7CC?

You can typically find the datasheet on the official Siemens Industry or Siemens Digital Industries website. Search using the product number "5SY6401-7CC".

Datasheets are usually available in PDF format within the product catalog or support sections. They contain detailed specifications and application notes.

If direct access is difficult, contacting a Siemens sales representative or authorized distributor can provide you with the necessary documentation.