An operation unit for controlling and protecting switch appliance includes an installing plate and a face shell marked with positions of automatic control trip, section, reset and isolation, a push rod, a push pedal, a rocker arm, a pull rod parallel to a pyromagnetic stripper, a master circuit contact set, an electromagnetic device unit and an isolation unit of KBO control and protection switch appliance are set in the installing plate, a manual operated indication button set at the positions mentioned above, a side cam, a trip cam, an intermediate cam, a middle retainer, a side retainer and a spring are in mounted in the installing plate.