The Residual Current Circuit Breaker (RCBO) integrates residual current protection and overcurrent protection into one unit, requiring no additional components. A single device can simultaneously protect against the risk of electric shock and equipment damage and fire hazards caused by overload and short circuits, providing a double safety barrier for residential and commercial electricity use. The product offers multiple sensitivity levels, including 30mA, 100mA, and 300mA, and supports multi-pole configurations such as 1P+N and 2P, flexibly adapting to different application scenarios and power distribution system requirements. Developed and manufactured in strict accordance with the IEC/EN 61009 international standard, core components are made of high-quality materials, ensuring long-term stable and reliable operation. Its compact design allows for easy integration into various distribution boxes and high-density installation environments, achieving comprehensive electrical safety protection.