A switch control apparatus for electric plants includes a box-like body which is adapted to be anchored to a fixed o movable part of an electric plant and has a closing panel with at least one passage therethrough, at least one contact unit which is accommodated in the box-like body at the passage and is adapted to be electrically connected to at least one respective electric circuit of the plant for selective open/close control thereof, at least one actuator which is adapted to interact with the contact unit for the latter to ensure selective opening/closing of the respective circuits, an anchor system for anchoring the contact unit to the actuator. The anchor system includes a container member which is adapted to enclose and contain the contact unit and to be anchored to the closing panel in the box-like body for stably securing the contact unit on the actuator.