DZ18-20F Leakage Circuit Breaker: for the protection of leakage, over pressure of single phase circuit, also for overload and shortcut. Appliances: AC50HZ, rated voltage 230v. DZ18-20 Leakage Circuit Breaker: for the protection of leakage, overload, shortcut. If the clients require, can also add the function of protection of over pressure. Mainly used in the protection of lighting and power allocation system.