Siemens 5SU1356-0KK06 Residual Current Circuit Breaker with Overcurrent Protection, 2P, 6A, B-Characteristic, 30mA, Type AC

The Siemens 5SU1356-0KK06 is a professional-grade residual current circuit breaker with overcurrent protection, commonly known as an RCBO. This 2-pole device is engineered to provide comprehensive electrical safety by combining the functions of a miniature circuit breaker and a residual current device in a single compact unit. It is designed to monitor electrical circuits for faults, effectively disconnecting the power supply when it detects short circuits, overloads, or dangerous leakage currents, thereby protecting both the electrical infrastructure and the end users.

Advantages

This device offers a high level of reliability and safety for modern electrical installations. By integrating overcurrent and residual current protection into one component, it saves significant space in distribution boards while simplifying the wiring process. The B-characteristic ensures precise tripping during overcurrent events, making it highly effective for standard residential and light commercial applications. Its robust construction ensures long-term operational stability and consistent performance under various environmental conditions.

Suitable for

• Residential electrical distribution boards
• Light commercial power circuits
• Protection of lighting and socket circuits
• General electrical safety in indoor environments

This device may not be suitable for industrial environments where high-frequency interference or DC components are present, as it is specifically designed for AC type leakage currents. It is also not intended for use in circuits requiring higher rated currents or different tripping characteristics, such as those involving large motor starters or heavy industrial machinery.

Key specifications

• Number of poles: 2
• Rated current: 6A
• Tripping characteristic: B
• Residual current sensitivity: 30mA
• Leakage current type: AC

To install the device, ensure the power supply is disconnected and mount the unit onto a standard DIN rail within the distribution board. Connect the incoming phase and neutral wires to the designated terminals, ensuring that the connections are tightened to the manufacturer's specified torque. Once installed, verify the wiring integrity and perform a functional test using the integrated test button to confirm the device trips correctly under simulated fault conditions.

What to consider before purchase

• Verify that the 6A rated current matches the requirements of your specific circuit load.
• Ensure the 30mA sensitivity is appropriate for the intended level of personnel protection.
• Confirm that the AC type leakage protection meets the regulatory requirements for your installation.
• Check the available space in your distribution board for a 2-pole device.

Regularly test the functionality of the residual current circuit breaker using the test button at least every six months to ensure the mechanical tripping mechanism remains operational and provides reliable protection.