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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The circuit breaker is an over-current protection. It shuts off if the current exceeds the rated capacity. Too much power draw and it turns off. It acts as a single _planned_ point of turn-off/ shutdown rather than the too-much-power causing a fire or electrocuting someone in an unexpected time or place. It makes appliances, especially old appliances that unexpectedly break, less dangerous overall.
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