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Lightning protection systems - What they do and don't do. A lightning protection system's only purpose is to ensure safety to a building and its occupants if lightning happens to hit it directly, a task accomplished by providing a good, safe path to ground for the lightning to follow.
With an automatic circuit breaker, the overload protection consists of two elements connected in series: 1  a magnetic circuit breaker that protects against short circuits; 2  a thermal circuit breaker that responds automatically to overload.