A gas-insulated low- or medium-voltage switch for system voltages within 1 to 52 kV and for up to 2000 A rated current includes first and second contacts being movable in relation to each other along an axis of the switch and defining a quenching region in which an arc is formed during a current breaking operation; and an arc-extinguishing system for extinguishing the arc during the current breaking operation. The arc-extinguishing system may include a pressurization system with a puffer chamber, and a nozzle system connecting the pressurization system with the quenching region, the nozzle system having a nozzle at its outlet for blowing the pressurized quenching gas onto the arc formed in the quenching region during the current breaking operation; and a swirling device configured for generating a subsonic swirl flow of a quenching gas onto the quenching region during the current breaking operation, wherein the swirling device is arranged at an entrance of the nozzle system. The arc-extinguishing system further includes a swirling device configured for generating a subsonic swirl flow of a quenching gas onto the quenching region during the current breaking operation, wherein the swirling device is arranged at an entrance of the nozzle system.

A gas-insulated low- or medium-voltage switch for system voltages within 1 to 52 kV and for up to 2000 A rated current includes first and second contacts being movable in relation to each other along an axis of the switch and defining a quenching region in which an arc is formed during a current breaking operation; and an arc-extinguishing system for extinguishing the arc during the current breaking operation. The arc-extinguishing system may include a pressurization system with a puffer chamber, and a nozzle system connecting the pressurization system with the quenching region, the nozzle system having a nozzle at its outlet for blowing the pressurized quenching gas onto the arc formed in the quenching region during the current breaking operation; and a swirling device configured for generating a subsonic swirl flow of a quenching gas onto the quenching region during the current breaking operation, wherein the swirling device is arranged at an entrance of the nozzle system. The arc-extinguishing system further includes a swirling device configured for generating a subsonic swirl flow of a quenching gas onto the quenching region during the current breaking operation, wherein the swirling device is arranged at an entrance of the nozzle system.

A high-voltage circuit breaker filled with gas, including two arcing contacts, a support in which a thermal volume, a compression volume, and an exhaust gas chamber are formed. A first radial wall separating the thermal volume and the compression volume, which is movable within the support. A second radial wall separating the compression volume and the exhaust gas chamber. A buffer volume is formed in the support and is separated from the compression volume and the exhaust gas chamber by associated walls, that are designed to be connected to the compression volume only to allow gas stored in the buffer volume to be discharged towards the compression volume.

To improve an interruption process, a switching chamber for a gas-insulated circuit breaker comprises a thermal channel having a bend part delimited by an outer surface of an auxiliary insulating nozzle including a first bend section on a thermal volume side, a third bend section on an arcing region side, and a second bend section connecting the first bend section to the third bend section, and by an inner surface of a main insulating nozzle including a fourth bend section on a thermal volume side, a sixth bend section on an arcing region side, and a fifth bend section connecting the fourth bend section to the sixth bend section, such that in axial section view, the first to sixth bend sections form 30 degrees arcs of circles having respective radii R1, R2, R3, R4, R5 and R6 such that R1>R2>R3 and R4>R5>R6.

A gas-insulated high or medium voltage circuit breaker includes: a first arcing contact and a second arcing contact, whereby at least one is axially movable along a switching axis, thereby forming an arc between the first arcing contact and the second arcing contact in an arcing region, a buffer cylinder including a channel directed to the arcing region and/or a nozzle for blowing during the breaking operation an arc-extinguishing gas to the arcing region; a first enclosure associated to first arcing contact substantially sur-rounding the buffer cylinder and arranged slidable in respect to the buffer cylinder and/or a second enclosure substantially surrounding the nozzle and arranged slidable in respect to the nozzle; and a labyrinth structure provided in the first enclosure and/or in the buffer cylinder between the first enclosure and the buffer cylinder and/or in the second enclosure and/or in the nozzle between the second enclosure and the nozzle.