EKL15-63B B type RCBO is an advanced circuit protection device that combines the functions of a residual-current device (RCD) and a miniature circuit breaker (MCB). This hybrid device is designed to protect circuits from both overcurrents (such as short circuits and circuit overloads) and residual currents (commonly known as leakage currents). The "B type" classification refers to the residual current protection characteristics, specifically designed to handle non-sinusoidal complex waveforms. It complies with the IEC61009-1 and IEC62423 standards.

The main characteristics of a Type B RCBO include:

1. Residual Current Sensitivity: Type B RCBOs are designed to detect smooth DC fault currents, pulsating DC fault currents, and AC fault currents. They are particularly suited for circuits that could produce any form of DC residual current or mixed AC and DC residual currents.

2. Wide Range of Application: Due to their ability to detect both AC and DC fault currents, Type B RCBOs are suitable for use in environments with electronic devices that could generate DC fault currents. This includes installations with photovoltaic (solar) systems, electric vehicle charging stations, UPS systems, and frequency converters.

3. Protection Level: They provide protection against earth leakage currents, ensuring personal safety and protecting against fire hazards caused by fault currents.

4. Overcurrent Protection: Besides offering protection against residual currents, Type B RCBOs also protect circuits from overloads and short circuits, thereby safeguarding the electrical installation and connected devices.

5. Selective Tripping: In a system where multiple RCBOs are installed, a Type B RCBO ensures that only the circuit with the fault is disconnected, minimizing disruption to the electrical supply in other circuits.

6. Compatibility and Installation: Type B RCBOs are designed to fit in standard consumer units or distribution boards, making them a versatile option for both new installations and upgrades to existing systems.