But I am interested to know the MCB and RCD as it provides better security against shock prevention If you answer me this question. The pictures also show very clear connections and the path to the grounding cables. For many years the voltage was driven ELCB and differential power powered ELCB both called Elcbs because it was a simpler name to remember. I didnt have time to figure out which of the green wiring cables actually plugged into grounding electrodes outside the house. The fuse requires clearly more power to blow it at the time but notice how much larger both of these streams are than 30 amps labeled the current rating.But I am interested to know out of MCB and RCD which one offers better safety against shock prevention If u please answer me this question.The pictures there also show very clearly the connections and the path of the grounding cables.For many years the voltage operated ELCB and the differential current operated ELCB were both referred to as ELCBs because it was a simpler name to remember.I just didnt have the time to find out which of the green wiring cables actually connects to the grounding electrodes outside the house.The fuse clearly requires more current to blow it in that time but notice how much bigger both these currents are than the 30 amps marked current rating.