A Medium Voltage panel that comprises: a casing having internal walls that define at least a first, a second and a third compartment, respectively housing a circuit breaker unit, a bus-bar system and a cable system, and in which at least a portion of the walls between the circuit breaker compartment and the bus-bar compartment, and between the circuit breaker compartment and the cable compartment are made of insulating material. In the panel, for each phase: the circuit breaker unit comprises a first and a second connection contacts; a third connection contact is positioned in the second compartment and is connected to a corresponding bus-bar; a fourth and a fifth connection contacts are positioned in the third compartment and are respectively connected to a corresponding cable and to ground. Also, the circuit breaker unit is movable between three positions so as to realize three different operating states of the panel.