Siemens 5SU1356-1KK06 AC Type Residual Current Earth Leakage Switch 6A 30mA 1P+N C

The Siemens 5SU1356-1KK06 is a high-performance AC type residual current earth leakage switch designed for robust electrical protection. This 1P+N C-curve device boasts a 6A rated current and a sensitive 30mA residual current, offering crucial safety against electrical shocks and fire hazards. Its compact design and advanced tripping characteristics make it an ideal solution for a wide range of residential, commercial, and industrial applications demanding reliable earth leakage protection.

Product Specifications

| Feature                 | Specification                               |

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

| Product Type            | Residual Current Earth Leakage Switch       |

| Manufacturer            | Siemens                                     |

| Model Number            | 5SU1356-1KK06                               |

| Rated Current (I n )    | 6A                                          |

| Residual Current (I n ) | 30mA                                        |

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

| Tripping Curve          | C-Curve                                     |

| Rated Voltage (U n )    | 230/400V AC                                 |

| Frequency               | 50/60 Hz                                    |

| Breaking Capaciity (I I) | 6 kA                                        |

| Terminal Type           | Screw Terminals                             |

| Mounting Type           | DIN Rail                                    |

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

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

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

Core Features & Market Positioning

The Siemens 5SU1356-1KK06 stands out in the competitive landscape due to its advanced AC tripping technology, ensuring effective protection against sinusoidal alternating currents. Its C-curve characteristic provides robust protection against both short-circuit currents and overload, offering a versatile solution for circuits with moderate inrush currents. Siemens' reputation for quality and reliability underpins this device, positioning it as a trusted component for demanding electrical installations where safety and operational continuity are paramount. The 1P+N configuration is particularly advantageous for single-phase systems, simplifying wiring and ensuring comprehensive protection for both the phase and neutral conductors.

Key Application Scenarios

This residual current earth leakage switch is extensively utilized in residential building installations to protect circuits supplying lighting, socket outlets, and appliances, significantly reducing the risk of electric shock. In commercial settings, it is critical for safeguarding office spaces, retail environments, and server rooms where sensitive electronic equipment is prevalent. For industrial applications, the Siemens 5SU1356-1KK06 is deployed in control panels and distribution boards for machinery, lighting circuits, and auxiliary power supplies, ensuring personnel safety and preventing downtime caused by earth faults. Its suitability extends to areas with higher humidity or where water ingress is a potential concern, provided appropriate enclosure protection is maintained.

Practical System Integration Guidance

Integrating the Siemens 5SU1356-1KK06 into existing electrical systems is straightforward due to its standard DIN rail mounting and readily accessible screw terminals. Proper wiring involves connecting the incoming phase conductor to terminal L and the neutral conductor to terminal N on the supply side. The outgoing phase and neutral conductors for the protected circuit are then connected to the corresponding output terminals. It is imperative to ensure that the neutral conductor of the protected circuit exclusively passes through the switch's neutral terminal to guarantee correct residual current detection. For optimal performance and safety, always adhere to local electrical codes and regulations during installation.

Operation and Risk Mitigation

The primary function of the 5SU1356-1KK06 is to rapidly disconnect the electrical circuit when an imbalance between the incoming and outgoing current (indicating an earth leakage) exceeds 30mA, thereby preventing dangerous voltage build-up on exposed conductive parts. Regular testing via the integrated test button is crucial to verify the switch's operational integrity. Depressing the test button simulates an earth fault, and if the switch functions correctly, it will trip, interrupting power. In the event of persistent tripping, investigation into the protected circuit for insulation faults, short circuits, or excessive leakage current is necessary before re-energizing. Avoid re-closing the switch if the fault condition is not resolved.

Scalability & Long-Term Value

The Siemens 5SU1356-1KK06 is part of Siemens' broader range of modular circuit protection devices, allowing for seamless integration into larger Siemens electrical distribution systems. Its compatibility with other components within the Siemens 5SU1 series ensures that systems can be easily expanded or upgraded as electrical demands evolve. While this specific model is designed for direct AC current protection, its robust construction and adherence to international standards ensure long-term reliability and performance. Integration with modern building management systems or industrial automation platforms can be achieved through appropriate intermediary relay or control logic, extending its value into smart grid and IIoT environments.

FAQs

What is the primary function of the Siemens 5SU1356-1KK06?

The primary function is to protect electrical circuits and individuals from the dangers of earth leakage faults. It detects imbalances in current flow and rapidly disconnects the power supply to prevent electric shock and fires. This ensures a high level of safety in various electrical installations.

This residual current device (RCD) is crucial for detecting sinusoidal AC fault currents. It safeguards against indirect contact by tripping when leakage current exceeds a specified threshold, typically 30mA. Its presence is a fundamental safety measure in modern electrical systems.

The switch actively monitors the current in both the phase and neutral conductors of a circuit. If these currents differ by more than 30mA, indicating current is leaking to earth, the device trips. This rapid disconnection minimizes the risk of electrocution and equipment damage.

How is the Siemens 5SU1356-1KK06 rated in terms of current and sensitivity?

This device has a rated current of 6 Amperes (6A). This rating determines the maximum continuous current it can safely handle in a protected circuit. It is suitable for circuits with moderate power demands.

Its sensitivity is defined by its residual current rating, which is 30 milliamperes (30mA). This means it will trip when it detects a leakage current of 30mA or more flowing to earth. This sensitivity is standard for personal protection against electric shock.

The combination of 6A and 30mA makes the 5SU1356-1KK06 ideal for protecting smaller circuits, such as those for lighting, socket outlets, or specific low-power appliances. It offers a balance between operational capacity and life-saving safety.

What type of tripping curve does the Siemens 5SU1356-1KK06 feature?

The Siemens 5SU1356-1KK06 is equipped with a C-curve tripping characteristic. This curve defines how the device responds to overcurrents, particularly those caused by moderate inrush currents.

A C-curve provides a delay in tripping for short-duration current surges, such as those generated by motors or transformers when they start up. This prevents nuisance tripping of the breaker during normal operation. However, it still offers rapid protection against short circuits.

This characteristic makes it versatile for applications where connected equipment might have higher-than-average starting currents. It ensures the circuit remains operational under normal load conditions while providing essential protection against dangerous fault conditions.

Can the Siemens 5SU1356-1KK06 be used for DC earth leakage protection?

No, the Siemens 5SU1356-1KK06 is specifically designed as an AC type residual current earth leakage switch. It is intended for detecting and protecting against sinusoidal alternating current (AC) earth faults.

It will not reliably detect or respond to pure direct current (DC) earth leakage faults. For systems that generate DC leakage currents, specialized RCDs (like Type B) or integrated residual current devices are required.

Using an AC-type RCD for DC leakage can lead to a false sense of security or, in some cases, saturation of the RCD's sensing mechanism, rendering it ineffective for AC faults as well. Always select the RCD type appropriate for the expected fault currents.

What is the breaking capacity of the Siemens 5SU1356-1KK06?

The breaking capacity, denoted as I cu, for the Siemens 5SU1356-1KK06 is 6 kA. This is a crucial safety parameter indicating the maximum fault current the switch can safely interrupt without sustaining damage.

A breaking capacity of 6 kA signifies that this device is suitable for installation in distribution boards where the prospective short-circuit current at the point of installation does not exceed 6,000 Amperes. This level is typical for many residential and light commercial applications.

Ensuring the breaking capacity of the installed protective device is higher than the maximum prospective fault current at that location is vital for electrical safety. It prevents catastrophic failure of the device during a severe short circuit event.

What are the pole configuration and voltage rating of this device?

The Siemens 5SU1356-1KK06 features a 1P+N pole configuration. This means it includes one protected pole (the phase conductor) and a neutral conductor, which is also switched by the device.

This 1P+N design is specifically intended for single-phase electrical circuits. It provides comprehensive protection by switching both the live and neutral lines simultaneously, ensuring complete isolation of the circuit when a fault occurs.

The device is rated for a nominal voltage of 230/400V AC. This indicates its suitability for use in standard single-phase (230V) and three-phase (400V) distribution systems, although it is primarily used for single-phase protection in this configuration.

How do I install the Siemens 5SU1356-1KK06?

Installation requires mounting the device onto a standard 35mm DIN rail within an electrical enclosure or distribution board. Ensure the enclosure provides adequate protection against environmental factors.

Connect the incoming phase conductor to the terminal marked 'L' (line) on the input side, and the incoming neutral conductor to the terminal marked 'N' on the input side. The outgoing phase conductor for the protected circuit connects to the output 'L' terminal, and the outgoing neutral to the output 'N' terminal.

Crucially, the neutral conductor of the protected circuit must pass through the 'N' terminal of the RCD. This ensures that the device can accurately measure the current imbalance. Always follow local wiring regulations and best practices during installation.

What is the purpose of the test button on the Siemens 5SU1356-1KK06?

The test button, often labeled 'T' or with a test icon, is a vital feature for periodic functional checks of the residual current device. It simulates an earth fault condition within the device itself.

Pressing the test button injects a small, controlled current between the phase and neutral conductors internally, mimicking a leakage to earth. If the RCD is functioning correctly, this simulated fault will cause it to trip, disconnecting the circuit.

Regularly testing the RCD (monthly is recommended) ensures its operational readiness. If the device does not trip when the test button is pressed, it indicates a malfunction, and the RCD must be replaced immediately to maintain safety.

What are the typical applications for a 6A, 30mA, C-curve RCD like this?

A 6A rated device with 30mA sensitivity and a C-curve is commonly used for protecting circuits with relatively low power consumption and potential for moderate inrush currents. This includes lighting circuits in residential and commercial buildings.

It is also well-suited for protecting socket outlet circuits in homes, offices, and other commercial spaces, especially where sensitive electronics or smaller appliances are connected. The C-curve helps prevent nuisance tripping from devices like phone chargers or small electronic devices.

In industrial settings, it might be employed for specific control circuits, auxiliary power supplies, or low-power machinery where precise earth leakage protection is needed without being overly sensitive to operational surges.

Where can I find the Siemens 5SU1356-1KK06 product documentation or datasheet?

Official product documentation, including detailed datasheets and installation manuals for the Siemens 5SU1356-1KK06, can typically be found on the Siemens Industry website or through authorized Siemens distributors. Searching for the exact product number will yield the most relevant results.

These documents provide comprehensive technical specifications, wiring diagrams, safety instructions, and compliance information. They are essential resources for engineers, electricians, and installers to ensure correct application and safe integration of the device.

Accessing these official sources guarantees that you are working with the most up-to-date and accurate information provided directly by the manufacturer, Siemens. Always refer to the latest revision of the documentation.