Why must circuit breaker be hooked in series with a line of appliance even though the line of appliances are hooked together in parallel?

Question

Why must circuit breaker be hooked in series with a line of appliance even though the line of appliances are hooked together in parallel?

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Answer 1

Kirschoff’s current law. The result is the current going through a series circuit is the same across the whole thing.

The breaker’s purpose is to reduce all current to zero. By being placed in series to everything else, when the breaker reduces the current passing through it to zero, it reduces all other current to zero as well.