Siemens 5SU1356-7KK25 Double Pole Earth Leakage Breaker 25A 30mA 1P+N C

The Siemens 5SU1356-7KK25 is a robust Double Pole Earth Leakage Breaker designed for reliable protection in demanding electrical installations. This 25A, 30mA, 1P+N (one pole plus neutral) device offers advanced safety features and seamless integration into modern electrical systems. Its core advantage lies in its swift detection and interruption of fault currents, significantly mitigating risks of electric shock and fire hazards. Engineered for precision and durability, the 5SU1356-7KK25 meets stringent industrial standards, making it a preferred choice for protecting sensitive equipment and ensuring personnel safety.

Product Specifications

| Feature                  | Specification                                 |

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

| Product Type             | Double Pole Earth Leakage Breaker             |

| Manufacturer             | Siemens                                       |

| Model Number             | 5SU1356-7KK25                                 |

| Rated Current (In)       | 25A                                           |

| Residual Current (IΔn)   | 30mA                                          |

| Poles                    | 1P+N (1 Pole + Neutral)                       |

| Breaking Capacity (kA)   | 6                                             |

| Tripping Characteristic  | C-Type                                        |

| Rated Voltage (Un)       | 230/400V AC                                   |

| Frequency                | 50/60 Hz                                      |

| Mounting Type            | DIN Rail                                      |

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

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

| Compliance Standards | IEC/EN 61009-1, IEC/EN 61009-2-1              |

Core Features & Market Positioning

The Siemens 5SU1356-7KK25 stands out due to its high-quality construction and advanced tripping technology, ensuring superior earth leakage protection. Its C-type tripping characteristic is optimized for circuits with moderate inrush currents, common in industrial settings, preventing nuisance tripping while maintaining rapid fault response. This breaker is positioned as a premium safety solution, offering peace of mind through reliable performance and compliance with international safety standards like IEC/EN 61009. The integrated neutral pole provides comprehensive protection for single-phase circuits.

Key Application Scenarios

This earth leakage breaker is ideally suited for a wide array of applications, including residential electrical panels, commercial buildings, and industrial facilities. It is particularly effective in protecting circuits supplying power to appliances, machinery, and lighting systems where the risk of earth faults is present. Specific use cases include protecting circuits in damp environments like kitchens and bathrooms, safeguarding IT equipment, and ensuring the safety of personnel working with electrical tools. The 25A rating and 30mA sensitivity make it a versatile choice for general-purpose circuits.

Practical System Integration Guidance

Integrating the Siemens 5SU1356-7KK25 into existing electrical systems is straightforward due to its standard DIN rail mounting. Ensure the main power supply is de-energized before installation. Connect the line conductor to the designated 'L' terminal and the neutral conductor to the 'N' terminal on the input side. The output terminals should then be connected to the protected circuit's line and neutral conductors, respectively. Proper grounding of the overall system is paramount for the earth leakage breaker to function effectively. Always adhere to local electrical codes and regulations during installation.

Operation and Risk Mitigation

The 5SU1356-7KK25 operates by continuously monitoring the balance of current flowing through the live and neutral conductors. If an imbalance exceeding 30mA is detected, indicating current is leaking to earth, the breaker rapidly trips, interrupting the circuit. This swift action significantly reduces the risk of electric shock, electrical fires, and damage to equipment. Regular testing of the earth leakage function using the integrated test button is recommended to ensure its continued operational integrity. Avoid overloading the circuit beyond its 25A rating to prevent premature wear and maintain optimal performance.

Scalability & Long-Term Value

Siemens' commitment to interoperability means the 5SU1356-7KK25 can be seamlessly integrated into Siemens' broader electrical distribution and control systems, offering excellent scalability. Its compatibility with standard busbars and terminal blocks simplifies expansion and upgrades within an electrical panel. For facilities embracing digital transformation, this breaker forms a reliable foundation for smart electrical infrastructure, allowing for future integration with monitoring and control solutions that enhance energy management and predictive maintenance capabilities, thereby providing enduring long-term value.

Frequently Asked Questions

Q1: What is the primary function of the Siemens 5SU1356-7KK25?

This device acts as a safety mechanism. It detects current leakage to the earth. Its main purpose is to prevent electric shocks.

It rapidly disconnects power when a fault is found. This protects people and prevents electrical fires. It's a crucial safety component.

The 30mA sensitivity ensures it responds to small, dangerous current flows. This offers a high level of protection.

Q2: What does "Double Pole Earth Leakage Breaker 1P+N" mean?

"Double Pole" signifies it interrupts both live and neutral. This ensures complete isolation of the circuit. It's safer than single-pole devices.

"1P+N" specifies it protects one live conductor and the neutral. This is standard for single-phase circuits. It provides comprehensive circuit control.

This design ensures that when the breaker trips, both conductors are disconnected. This prevents residual voltage issues. It's essential for many applications.

Q3: What is the significance of the 25A and 30mA ratings?

The 25A rating indicates the maximum continuous current it handles. It protects against overloads. Exceeding this can damage the breaker.

The 30mA rating is the sensitivity for earth leakage. It's the threshold for tripping. This level is considered safe for human contact.

Together, these ratings define its protection capabilities. It manages both overcurrent and earth fault situations. It's a versatile protective device.

Q4: Can the Siemens 5SU1356-7KK25 be used in residential settings?

Yes, it is highly suitable for residential use. It enhances safety in homes. It protects against common electrical hazards.

It is commonly installed in main distribution boards. It guards circuits for appliances and lighting. It meets safety standards for dwellings.

Using this breaker in homes provides excellent protection against electric shock. It's a valuable addition to any home's electrical safety.

Q5: What type of electrical faults does this breaker detect?

It primarily detects earth leakage faults. This occurs when current flows to ground unexpectedly. It can be due to damaged insulation.

It also offers protection against overcurrents. This includes overloads and short circuits. These faults generate excessive heat.

The breaker responds to both types of faults independently. This provides dual layers of electrical protection. It ensures circuit integrity.

Q6: How is the C-Type tripping characteristic beneficial?

C-Type breakers are designed for circuits with moderate inrush currents. This includes inductive loads like motors. It prevents nuisance tripping.

It offers a good balance between sensitivity and surge handling. This is ideal for many industrial and commercial applications. It ensures reliable operation.

This characteristic allows for efficient operation. It trips quickly on significant faults. It minimizes downtime and protects equipment.

Q7: Is installation of this breaker complex?

Installation is generally straightforward. It uses a standard DIN rail mounting system. This is common in electrical panels.

Wiring involves connecting line and neutral inputs. Then, connecting line and neutral outputs to the circuit. Always follow safety procedures.

Ensure the power is off before installation. Proper wiring is crucial for its function. Consult an electrician if unsure.

Q8: What are the environmental operating conditions for this breaker?

It operates within a temperature range of -25°C to +45°C. This covers most typical environments. Avoid extreme heat or cold.

Its enclosure provides IP20 protection against solid objects. The terminals have IP40 protection. It's suitable for indoor electrical cabinets.

Avoid prolonged exposure to moisture or dust. Ensure proper ventilation in its mounting location. This maintains its longevity.

Q9: How often should the earth leakage function be tested?

Regular testing is crucial for reliability. It's recommended to test monthly. This ensures the tripping mechanism is functional.

Use the built-in test button on the breaker. Depress it firmly while the circuit is energized. It should trip immediately.

If it fails to trip, investigate the issue. It may require replacement or professional servicing. Regular testing ensures safety.

Q10: Where can I find official documentation for the Siemens 5SU1356-7KK25?

Official documentation is available on Siemens' industry portal. Search for the product model number. You will find datasheets and manuals.

Technical specifications and installation guides are provided. These resources offer detailed insights. They are essential for proper use.

Always refer to the latest versions of documents. These are available via Siemens' official website. Ensure compliance with all guidelines.