What is RCCB and how does it work? This is one of the questions I have encountered during my job interview for a sales distribution company. Honestly, I had a hard time answering the question and just relied on the words itself. There is a specific purpose and explanation why they call it RCCB and its working principle. That actually made a way for me to study it and make an article for it. As the improvement of modern industry, I observed that the electricity is becoming more useful, but it also becoming more hazardous too! Do you know that it takes only few milliseconds for a strong electric current flowing through your heart to harm you? Think about this, if you’re using an