Breaker device for interrupting current on a transmission line

A breaker device for interrupting current flowing on a transmission line, the device comprising three electrical branches connected in parallel:

• a main branch (B1) in which the current to be interrupted flows;
• an auxiliary branch (B2);
• and a voltage limiter branch (B3);
• the main branch comprising at least one semi-conductor breaker cell (CEL1, CELG1) connected in series with at least one mechanical interrupter/disconnector (Sm), the semi-conductor breaker cell (CEL1, CELC1) including at least one semi-conductor element (1, 4) configured to be commanded to open or close and that is connected in parallel with a voltage limiter (5, 3), the auxiliary branch (B2) comprising at least one assembly that is constituted by at least one capacitor (Ca) connected in parallel with at least one resistor (Ra), said assembly being connected in series with at least one thyristor, the device further comprising a control circuit (CM) configured to command opening of the semi-conductor element of the semi-conductor breaker cell (CEL1, CELG1) and opening of the mechanical interrupter/disconnector (Sm), the control circuit (CM) further configured to act, once the current is interrupted in the semi-conductor element of the semi-conductor breaker cell, to command the thyristor of the auxiliary branch (B2) to be put into a conductive state at an instant that is after or at the instant at which the current flowing in the voltage limiter(s) reaches the value of the current (I1) that is flowing in the transmission line.