The NB3LE Residual Current Operated Circuit Breaker (RCBO) is an electronic device designed for comprehensive electrical safety, combining robust overload, short-circuit, and earth leakage fault protection. It safeguards both personnel and installations by automatically disconnecting power upon detecting electric shock or current leakage. With various current ratings, sensitivities (e.g., 30mA for enhanced direct contact protection), and B and C tripping curves, this versatile RCBO provides precise circuit control and reliable protection, making it ideal for a wide range of applications in residential, commercial, industrial, and high-rise building electrical systems.