Normally in electrical circuits, the input current is equal to the output, but if for any reason there is a difference between the phase and neutral wires (in single-phase circuits), the life-saving switch will act.
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RCCB
It is a type of switch that cuts off the circuit if there is a difference between the input and output currents by comparing the input and output currents
![](/portals/0/RCCb.jpg)