Residual current operated circuit breaker (RCBO) has the function of overload and short circuit protection, isolation and current protection, i.e., besides the protection function of Miniature Circuit Breaker, it can also serve as additional protection for direct or indirect or protective measures for electric fire. It is especially suited for places with low safety level, such as bathroom, swimming pool, plug socket or transformer. The main benefits include that of the breaking capacity is up to 6kA; The shell and other plastic parts are made of high flame retardant, high temperature resistant and impact resistant plastic; Installation guide rail and size modularization; The dynamic test device makes the button more flexible and reliable; The Rated impulse withstand voltage(1.2/50) Uimp is up to 6kV.