Why are ordinary circuit breakers and fuses ineffective in preventing shocks?

Fuses and circuit breakers are both meant to stop electricity from flowing. They do so, however, in various ways. When the fuse is overheated, it acts like a piece of metal that melts. When an overflow of electricity is detected, a circuit breaker activates a switching mechanism.

Normal circuit breakers and fuses simply protect against thermal overload, which can harm the working of the electrical instruments in use.

Both of them work in the same way: when the current exceeds their capacity, which is far higher than the \(5A\) current, the trip (maximum value of harmless current).

The current that trips circuit breakers and fuses is more than the maximum safe current that a human body can withstand, hence they cannot provide shock protection.