The residual current action circuit breaker can automatical ly cut off the faulty power supply in a very short time to ensure the safety of people and electrical equipment The residual current circuit breaker can also be used as the infrequent conversion operation of the line under normal and normal conditions,which is suitable for various occasions such as industrial , commercial, high - rise buildings and civil residences. The residual current action circuit breaker can automatcally cut off the faulty power supply in a very short time to ensure the safety of people and electrical equipment. The residual current circuit breaker can also be used as the infrequent conversion operation of the line under normal and normal conditions, which s suitablefor various occasions such as industrial,commercial,high-rise buildings and civil residences.