Misjudgement-proof device of hydraulic electromagnetic circuit breaker

The utility model discloses a misjudgement-proof device of a hydraulic electromagnetic circuit breaker. The wiring mechanism, the contact system, the arc extinction system, the operating mechanism and the hydraulic magnetic tripper of the hydraulic electromagnetic circuit breaker are all positioned in a shell; a handle on an operation mechanism extends out of a gap on the shell to manually realize the movement of the contact system; the wiring mechanism is electrically connected with an outside circuit; the hydraulic magnetic tripper system converts current into magnetic flux to realize the tripping movement of the contact system; the arc extinction system realizes arc extinction movement after a contact is disconnected; an extruded protective cover is detachably arranged above the shell; the protective shell is covered above the handle of the operation mechanism and prevents an operator from touching the handle when the circuit breaker is operated, thus preventing the circuit breaker from being disconnected