Siemens 5SU1656-7KK06 Type A Double Pole Earth Leakage Switch 6A 300mA 1P+N C

The Siemens 5SU1656-7KK06 Type A Double Pole Earth Leakage Switch is an advanced residual current circuit breaker with overcurrent protection (RCBO) designed for reliable safety in electrical installations. This unit offers robust protection against earth faults, short circuits, and overloads, ensuring the safety of personnel, equipment, and property. Its Type A sensitivity makes it particularly effective in detecting both AC and pulsating DC fault currents, providing a higher level of protection compared to standard Type AC devices. The double-pole design ensures that both the live and neutral conductors are disconnected simultaneously, offering a complete isolation solution.

Product Specifications

| Parameter                      | Value                                   |

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

| Manufacturer                   | Siemens                                 |

| Product Series                 | SENTRON 5SU1                            |

| Product Type                   | RCBO (Residual Current Circuit Breaker with Overcurrent Protection) |

| Model Number                   | 5SU1656-7KK06                           |

| Number of Poles (Total)        | 2 (1P+N)                                |

| Rated Current (In)             | 6 A                                     |

| Rated Fault Current (IΔn)      | 300 mA (0.3 A)                          |

| Leakage Current Type           | Type A (Detects AC and pulsating DC)    |

| Tripping Characteristic        | C (For inductive loads, typical)        |

| Rated Short-Circuit Breaking Capacity (Icn) | 6 kA (according to EN 61009-1) |

| Rated Voltage (Un AC)          | 230 V                                   |

| Frequency                      | 50 Hz                                   |

| Overvoltage Category           | III                                     |

| Pollution Degree               | 2                                       |

| Degree of Protection (IP)      | IP20                                    |

| Width (Modular Spacings)       | 2                                       |

| Built-in Depth                 | 70 mm                                   |

| Mechanical Service Life        | 10,000 operating cycles                 |

| Connection Type                | Terminal for solid and stranded conductors |

| Country of Origin              | Romania                                 |

Core Features & Market Positioning

The Siemens 5SU1656-7KK06 stands out in the market due to its Type A residual current sensitivity, offering enhanced protection against a wider range of fault currents, including pulsating DC components often found in modern electronic equipment. This differentiates it from standard Type AC devices. As part of Siemens' esteemed SENTRON range, it embodies a commitment to high-quality, reliable electrical protection solutions. Its robust construction, combined with a 6 kA breaking capacity, positions it as a dependable choice for demanding residential, commercial, and light industrial applications where safety and continuous operation are paramount. The dual-pole design is a key feature for comprehensive disconnection, crucial for maintenance and safety protocols. The product boasts an extended product life claim, aligning with Siemens' "Better World" initiatives, suggesting long-term value and reduced environmental impact.

Key Application Scenarios

This RCBO is ideally suited for protecting individual circuits in various environments. In residential settings, it provides essential safety for circuits supplying lighting, socket outlets, and appliances, particularly those with electronic components that might generate pulsating DC leakage currents. For commercial applications, such as offices or retail spaces, the Siemens 5SU1656-7KK06 is effective in safeguarding circuits for IT equipment, server rooms, and general power distribution, mitigating risks of fire and electric shock. In light industrial or workshop environments, it can protect machinery and power tools that are prone to generating earth faults, offering reliable protection against electrical hazards during operation. Its 300mA tripping sensitivity is specifically designed for personnel and fire protection, making it a critical safety device where direct contact or fire risk is a concern.

Practical System Integration Guidance

The Siemens 5SU1656-7KK06 is designed for straightforward installation on standard 35mm DIN rails within distribution boards or enclosures. It features a compact, 2-module width, allowing for efficient use of space. The device offers dual-side terminals, enabling power supply connections from either the top or the bottom, which provides flexibility during wiring. Both live and neutral conductors must be connected to the designated terminals. For optimal performance and safety, it is crucial to ensure that the incoming power supply is correctly rated for 230V AC and that the circuit's prospective short-circuit current does not exceed the device's 6 kA breaking capacity. Connection of conductors should be made using appropriate cable lugs or terminals, ensuring a secure and solid connection to prevent overheating or potential faults. It is recommended to perform a test of the residual current function using the integrated test button after installation to verify correct operation.

Operation and Risk Mitigation

The primary function of the Siemens 5SU1656-7KK06 is to provide automatic disconnection of the electrical circuit in the event of an earth fault exceeding 300mA, or in case of overload or short circuit. The "C" tripping characteristic indicates that it is designed to withstand temporary inrush currents associated with inductive loads, such as motors, without nuisance tripping, while still providing rapid protection against short circuits. To mitigate risks, users should periodically test the device's functionality by pressing the "Test" button; a successful test should result in the tripping of the switch, confirming the integrity of the residual current detection. Regular visual inspection for any signs of damage or overheating is also advised. In the event of a fault, the switch handle will move to the "OFF" position. To reset, the handle must first be moved to the "OFF" position and then back to the "ON" position, provided the fault condition has been cleared. It's critical to ensure that installation and maintenance are performed by qualified electricians to adhere to safety standards and prevent electrical hazards.

Scalability & Long-Term Value

The Siemens 5SU1656-7KK06 is part of the broader Siemens SENTRON system, offering excellent compatibility with other Siemens low-voltage protection devices and components within this ecosystem. This facilitates easy integration into existing or future electrical installations, allowing for system expansion or upgrades without compromising compatibility. While this specific model focuses on core protection, Siemens offers a range of complementary products, such as surge protective devices and communication modules, which can be integrated into a more advanced, IIoT-enabled system for enhanced monitoring and control. The "Better World" claim associated with its extended product life suggests a long-term investment in reliable protection that minimizes the need for frequent replacements, contributing to sustainability and reduced total cost of ownership.

Frequently Asked Questions (FAQs)

What is the primary function of the Siemens 5SU1656-7KK06?

This device is an RCBO, offering combined protection. It detects earth faults and overcurrents like short circuits and overloads. It ensures safety for people and equipment.

It provides residual current protection, essential for preventing electric shock. It also acts as a miniature circuit breaker for overcurrent protection. This dual functionality streamlines electrical safety.

The Siemens 5SU1656-7KK06 is vital for preventing electrical fires and protecting sensitive electronics. Its Type A sensitivity is key for modern installations.

What does 'Type A' signify for this earth leakage switch?

Type A means it detects AC and pulsating DC residual currents. This is more advanced than Type AC devices. It offers broader protection against various fault types.

Many modern electronic devices create pulsating DC leakage currents. Type A ensures these are detected and the circuit is safely interrupted. This enhances protection significantly.

Using a Type A device is crucial for comprehensive safety in installations with computers or variable speed drives. It protects against specific fault conditions.

Can the Siemens 5SU1656-7KK06 be used for motor protection?

Yes, the 'C' tripping characteristic is suitable for inductive loads. This includes motors and transformers. It can handle their typical inrush currents.

The device provides overload and short-circuit protection for motor circuits. It ensures the motor and wiring are protected from damage. It offers reliable circuit interruption.

However, for heavy-duty motor starting, a dedicated motor protection circuit breaker might be more appropriate. This RCBO is ideal for general circuit protection with motors.

What is the breaking capacity of the Siemens 5SU1656-7KK06?

It has a rated short-circuit breaking capacity of 6 kA. This is according to EN 61009-1 standards. It is suitable for many residential and commercial systems.

This capacity indicates the maximum fault current it can safely interrupt. It's important to ensure the prospective fault current in the system does not exceed this limit.

For installations with higher fault current levels, a higher breaking capacity device may be necessary. Always verify system requirements.

What is the difference between this RCBO and a standard MCB?

An MCB only provides overcurrent protection (overload and short circuit). This RCBO offers both overcurrent and earth leakage protection. It combines two devices into one.

The residual current function is absent in a standard MCB. The RCBO detects current imbalances, crucial for preventing electric shock. It offers a higher level of safety.

This integrated protection simplifies installation and wiring. It saves space in distribution boards compared to separate MCBs and RCDs.

What is the purpose of the test button on the device?

The test button allows you to periodically check the RCBO's residual current function. It simulates an earth fault. This verifies the device is operating correctly.

Pressing the test button should trip the switch. This confirms the internal mechanism for earth leakage detection is functional. It's a critical safety check.

It is recommended to test the device monthly. This ensures it remains operational and provides continuous protection. Always consult the manual for specific testing instructions.

What does '1P+N' mean for the poles?

'1P+N' signifies a 1-pole plus neutral device. It means both the live (phase) conductor and the neutral conductor are switched and protected. This ensures complete isolation.

This double-pole design disconnects both live and neutral simultaneously. This is essential for safety during maintenance or fault conditions. It prevents hazards from neutral conductors.

Unlike a single-pole device which only switches the live conductor, the 1P+N configuration provides a higher degree of safety. It ensures full circuit disconnection.

What is the environmental suitability of the Siemens 5SU1656-7KK06?

This RCBO has an IP20 degree of protection. This means it is protected against solid objects greater than 12.5mm. It is suitable for indoor installations within enclosures.

It is halogen-free and silicon-free, indicating it meets certain environmental standards. This is often a requirement in sensitive industrial or electronics applications.

The product is also noted for having an "Extended product life" claim. This suggests durability and a reduced need for replacement, aligning with sustainability goals.

How does the 'C' curve differ from 'B' or 'D' curves on circuit breakers?

The 'C' curve is designed for circuits with moderate inductive loads. It trips between 5 to 10 times the rated current. This prevents nuisance tripping on startup surges.

A 'B' curve trips between 3 to 5 times the rated current, ideal for purely resistive loads. A 'D' curve trips between 10 to 20 times the rated current, for high inrush current devices like large motors or transformers.

The 5SU1656-7KK06 uses a 'C' curve, making it versatile for common applications involving lighting, socket outlets, and some motor loads.

What is the operational temperature range for this device?

The Siemens 5SU1656-7KK06 can operate within an ambient temperature range of -25°C to 55°C. This wide range ensures reliable performance in various environmental conditions.

It's important to note that the device's current carrying capacity can derate at higher temperatures. The specification indicates reduced operational current at temperatures above 30°C.

Ensuring adequate ventilation within the enclosure where the RCBO is installed is crucial for maintaining its performance and lifespan, especially in warmer environments.