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.

RCBO

In addition to leakage current, this life-saving switch also reacts to overload and overcurrent.

Types of RCBO based on error detection mechanism:

Electronic lifeguard: Ability to detect faults by electrical mechanism

Magnetic life protector: Ability to detect error by magnetic mechanism