AOL series residual current action circuit breaker (with over-current protection) suitable for use inline AC50/60Hz, rated current up to 40A. AOL series residual current action circuit breaker (with over current protection) has the protection function of preventing leakage electric shock, overload, short circuit and so on. And it can also be used as a switch for connecting and disconnecting lines.AOLseries residual current action circuit breaker (with over-current protection) is widely used in industrial and commercial buildings, residential and other low-voltage terminal distribution places.