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The lightning protector may fail due to the impact of temporary overvoltage of lightning current for many times, or it may fail due to a large increase in leakage current due to long-term use. After the failure, the lightning arrester may be in an open circuit state and lose its protective effect, or it may be in a short circuit state and cause various hazards.
The surge protector connected in series with the overcurrent protector---fuse or circuit breaker can effectively cut off the short-circuit lightning protector when the lightning protector fails and short-circuits;
The indicator on the lightning protector can The display must be replaced.
If the surge protector is about to fail, it is neither a short circuit nor an open circuit, but the leakage current is too large, but it is not enough to make the circuit breaker connected in series with the lightning protector act. There is a risk of electric shock to the connected equipment.
