There is provided a gas circuit breaker that can reduce deformation of an insulation nozzle and leakage of arc-extinguishing gas compressed to be sprayed to an arc, and can more surely maintain electric insulation performance. A gas circuit breaker 1 includes a trigger electrode 31 which is arranged to be movable between a first arc contactor 21 and a second arc contactor 41, which ignites an arc generated between the first arc contactor 21 and the trigger electrode along with a movement in a first half of a current breaking action, and which ignites the arc on the second arc contactor 41 along with the movement in a latter half of the current breaking action, a compression chamber 36 for pressurizing arc-extinguishing gas, the compression chamber 36 being formed by a cylinder 42 which has an outer wall 51 and an inner wall 52, each being formed in a cylindrical shape, and which is provided to the second arc contactor 41, and a piston 33 that slides between the outer wall 51 and the inner wall 52 in conjunction with the trigger electrode 31, and an insulation nozzle 23 that guides the arc-extinguishing gas pressurized in the compression chamber 36 to an arc ignited between the first arc contactor 21 and the second arc contactor 41. The insulation nozzle 23 is supported by the inner wall 52 of the cylinder 42.

A load-break switch has a housing holding insulation gas at ambient pressure; a first main contact and a second main contact being movable relative to each other in an axial direction of the switch; a first arcing contact and a second arcing contact being movable relative to each other in the axial direction and defining an arcing region where an arc is formed during a current breaking operation, wherein the arcing region is located radially inward from the first main contact; a pressurizing system pressurizing a quenching gas during the current breaking operation; and a nozzle system arranged to blow the pressurized quenching gas onto the arc. The first main contact includes at least one pressure release opening to allow gas flow in a radial outward direction. A total area of the pressure release opening suppresses a reduction of gas flow out of the pressure release opening.

A gas-insulated low- or medium-voltage load break switch includes: a housing defining a housing volume for holding an insulation gas at an ambient pressure; a first arcing contact and a second arcing contact arranged within the housing volume, the first and second arcing contacts being movable in relation to each other along an axis of the load break switch and defining a quenching region in which an arc is formed during a current breaking operation; a pressurizing system having a pressurizing chamber arranged within the housing volume for pressurizing a quenching gas from an ambient pressure p.sub.0 to a quenching pressure p.sub.quench during the current breaking operation; and a nozzle system arranged within the housing volume for blowing the pressurized quenching gas in a subsonic flow pattern from the pressurization chamber onto the arc formed in the quenching region during the current breaking operation. The nozzle system includes at least one nozzle arranged for blowing the quenching gas from an off-axis position predominantly radially inwardly onto the quenching region.

A gas-insulated low- or medium-voltage load break switch includes: a housing defining a housing volume for holding an insulation gas at an ambient pressure; a first arcing contact and a second arcing contact arranged within the housing volume, the first and second arcing contacts being movable in relation to each other along an axis of the load break switch and defining a quenching region in which an arc is formed during a current breaking operation; a pressurizing system having a pressurizing chamber arranged within the housing volume for pressurizing a quenching gas from an ambient pressure p.sub.0 to a quenching pressure p.sub.quench during the current breaking operation; and a nozzle system arranged within the housing volume for blowing the pressurized quenching gas in a subsonic flow pattern from the pressurization chamber onto the arc formed in the quenching region during the current breaking operation. The nozzle system includes at least one nozzle arranged for blowing the quenching gas from an off-axis position predominantly radially inwardly onto the quenching region.

Disconnecting device for an energy conductor comprising at least one first connection part, at least one second connection part, at least one disconnection point arranged between the first and second connection parts, the disconnection point forming a current path between the first and second connection parts in a closed state and disconnecting a current path between the first and second connection parts in an open state, the disconnecting device having a flowable medium which is arranged in a guide housing and separates the disconnection point driven by a drive, the flowable medium at least partially surrounding the disconnection point at the moment of disconnection, and the disconnecting device having a bolt which is moved into the disconnection point immediately after the disconnection of the disconnection point by the flowable medium.

Disconnecting device for an energy conductor comprising at least one first connection part, at least one second connection part, at least one disconnection point arranged between the first and second connection parts, the disconnection point forming a current path between the first and second connection parts in a closed state and disconnecting a current path between the first and second connection parts in an open state, the disconnecting device having a flowable medium which is arranged in a guide housing and separates the disconnection point driven by a drive, the flowable medium at least partially surrounding the disconnection point at the moment of disconnection, and the disconnecting device having a bolt which is moved into the disconnection point immediately after the disconnection of the disconnection point by the flowable medium.

A gas-insulated load break switch and a gas-insulated switchgear having a gas-insulated load break switch. The gas-insulated load-break switch has a housing defining a housing volume for holding an insulation gas at an ambient pressure; a first main contact and a second main contact, the first and second main contacts being movable in relation to each other in the axial direction of the load break switch; a first arcing contact and a second arcing contact, the first and second arcing contacts being movable in relation to each other in an axial direction of the load break switch and defining an arcing region in which an arc is formed during a current breaking operation, wherein the arcing region is located, at least partially, radially inward from the first main contact; a pressurizing system having a pressurizing chamber for pressurizing a quenching gas during the current breaking operation; and a nozzle system arranged and configured to blow the pressurized quenching gas onto the arc formed in the quenching region during the current breaking operation, the nozzle system having a nozzle supply channel for supplying at least one nozzle with the pressurized quenching gas. The first main contact includes at least one pressure release opening formed such as to allow a flow of gas substantially in a radial outward direction, wherein the total area of the at least one pressure release opening is configured such that during a supply of the pressurized quenching gas, a reduction of the flow of gas out of the pressure release opening is suppressed.

Disconnecting device for an energy conductor comprising at least one first connection part, at least one second connection part, at least one disconnection point arranged between the first and second connection parts, the disconnection point forming a current path between the first and second connection parts in a closed state and disconnecting a current path between the first and second connection parts in an open state, the disconnecting device having a flowable medium which is arranged in a guide housing and separates the disconnection point driven by a drive, the flowable medium at least partially surrounding the disconnection point at the moment of disconnection, and the disconnecting device having a bolt which is moved into the disconnection point immediately after the disconnection of the disconnection point by the flowable medium.

Disconnecting device for an energy conductor comprising at least one first connection part, at least one second connection part, at least one disconnection point arranged between the first and second connection parts, the disconnection point forming a current path between the first and second connection parts in a closed state and disconnecting a current path between the first and second connection parts in an open state, the disconnecting device having a flowable medium which is arranged in a guide housing and separates the disconnection point driven by a drive, the flowable medium at least partially surrounding the disconnection point at the moment of disconnection, and the disconnecting device having a bolt which is moved into the disconnection point immediately after the disconnection of the disconnection point by the flowable medium.

According to an embodiment, a gas-blast circuit breaker comprises a heat removal unit in a flow path of arc extinguishing gas. The heat removal unit each includes: plate-shaped heat removal members contacting the arc extinguishing gas flowing in the flow path; and a holding portion holding the plate-shaped heat removal members to stack the heat removal members at intervals in a thickness direction. Each of the heat removal members includes: an upstream side end portion; a downstream side end portion; and a thickest portion with a largest thickness which is provided between the upstream side end portion and the downstream side end portion. Thickness of the heat removal member continuously changes between the upstream side end portion and the downstream side end portion via the thickest portion.