An electric switchgear , of the type including a plurality of controllable electronic switches , each comprising a first primary electrode , a second primary electrode and a control electrode , wherein: - the switches are arranged so as to form a matrix having at least two columns each comprising at least two switches , and at least two lines each including one of the switches from each column , - the first primary electrode of each switch of each column is electrically connected to a first electric branch of that column , the first branches of the columns being electrically connected to one another at a first electric node , - the second primary electrode of each switch of each column is electrically connected to a second electric branch of said column , the second branches of the columns being electrically connected to one another at a second electric node , - the device includes at least two distinct control branches , the control electrode of each switch of each line being electrically connected to a same control branch of that line , - each control branch includes a control element , electrically connected to the control electrode of each switch of the corresponding line , and connected to an electric power supply device , - each control branch includes the respective electric power supply device , characterized in that : - the power supply devices are galvanically isolated from one another, - each column includes a first substrate having a first conductive track forming the first electric branch of that column , and a second substrate , arranged substantially parallel to the first substrate , including a second conductive track forming the second electric branch of the column . - the switches are arranged so as to form a matrix having at least two columns each comprising at least two switches , and at least two lines each including one of the switches from each column , - the first primary electrode of each switch of each column is electrically connected to a first electric branch of that column , the first branches of the columns being electrically connected to one another at a first electric node , - the second primary electrode of each switch of each column is electrically connected to a second electric branch of said column , the second branches of the columns being electrically connected to one another at a second electric node , - the device includes at least two distinct control branches , the control electrode of each switch of each line being electrically connected to a same control branch of that line , - each control branch includes a control element , electrically connected to the control electrode of each switch of the corresponding line , and connected to an electric power supply device , - each control branch includes the respective electric power supply device , - the power supply devices are galvanically isolated from one another, - each column includes a first substrate having a first conductive track forming the first electric branch of that column , and a second substrate , arranged substantially parallel to the first substrate , including a second conductive track forming the second electric branch of the column . <EOS>