Integrated residual-current circuit breaker

A first operating mechanism and a second operating mechanism are arranged in an N-level shell, an L-level operating structure is arranged in an L-level shell, the first operating mechanism is connected with an N-level handle, the L-level operating mechanism is connected with an L-level handle, the second operating mechanism is in linkage connection with the L-level operating mechanism, and the L-level handle is connected with a second operating mechanism. When the L-level handle drives the N-level handle to be switched on, the L-level operating mechanism, the first operating mechanism and the second operating mechanism are switched on synchronously. When the L-level handle is independently opened, the L-level operating mechanism and the second operating mechanism are synchronously opened; when the N-level handle drives the L-level handle to open, the L-level operating mechanism, the first operating mechanism and the second operating mechanism are synchronously opened, and when the N-level handle is closed, th