A circuit breaker, comprising an enclosure comprising: at least two arcing contacts that are movable axially relative to each other, between an open position of the circuit breaker in which the arcing contacts are separated from each other and a closed position of the circuit breaker in which the arcing contacts are in contact with each other; and a gas inlet configured to blow an arc-control gas in order to interrupt an electric arc that is likely to form during movement of the arcing contacts from the closed position to the open position of the circuit breaker, wherein the arc-control gas comprises at least 80% of carbon dioxide; wherein the enclosure further comprises a catalytic material, which converts carbon monoxide that forms after ionization of the carbon dioxide during arcing, into carbon dioxide, said catalytic material comprising ceria and a precious metal.

A circuit breaker, comprising an enclosure comprising: at least two arcing contacts that are movable axially relative to each other, between an open position of the circuit breaker in which the arcing contacts are separated from each other and a closed position of the circuit breaker in which the arcing contacts are in contact with each other; and a gas inlet configured to blow an arc-control gas in order to interrupt an electric arc that is likely to form during movement of the arcing contacts from the closed position to the open position of the circuit breaker, wherein the arc-control gas comprises at least 80% of carbon dioxide; wherein the enclosure further comprises an adsorbing material, which adsorbs carbon monoxide that forms after ionization of the carbon dioxide during arcing, said adsorber being a metal-organic framework comprising nickel and/or iron.

The present invention relates to a device for interrupting non-short circuit currents only, and in particular relates to a disconnector, more particularly high voltage disconnector, or to an earthing switch, more particularly make-proof earthing switch, and further relates to a low voltage circuit breaker. The device comprises at least two contacts movable in relation to each other between a closed state and an open state and defining an arcing region, in which an arc is generated during a current interrupting operation and in which an arc-quenching medium comprising an organofluorine compound is present. According to the application, a counter-arcing component is allocated to the arcing region, the counter-arcing component being designed for counteracting the generation of an arc and/or being designed for supporting the extinction of an arc.

The present invention relates to a device for interrupting non-short circuit currents only, and in particular relates to a disconnector, more particularly high voltage disconnector, or to an earthing switch, more particularly make-proof earthing switch, and further relates to a low voltage circuit breaker. The device comprises at least two contacts movable in relation to each other between a closed state and an open state and defining an arcing region, in which an arc is generated during a current interrupting operation and in which an arc-quenching medium comprising an organofluorine compound is present. According to the application, a counter-arcing component is allocated to the arcing region, the counter-arcing component being designed for counteracting the generation of an arc and/or being designed for supporting the extinction of an arc.

A switching device for fast disconnection of short-circuit currents includes a switching bridge with a movable contacting element and a fixed contacting element. The switching bridge is operable in a closed state, in which the movable contacting element is in contact with the fixed contacting element, and an open state, in which the movable contacting element is spaced apart from the fixed contacting element. The switching device further includes an electromagnetic switching drive with a coil for generating a magnetic field and a magnet anchor, a guide sleeve to guide the movement of the magnet anchor in the magnetic field of the coil, a pyrotechnic propellant charge located in the cavity, and a supporting device for supporting the guide sleeve. The magnet anchor is arranged within the guide sleeve such that a cavity is formed below the magnet anchor.

A switching device for fast disconnection of short-circuit currents includes a switching bridge with a movable contacting element and a fixed contacting element. The switching bridge is operable in a closed state, in which the movable contacting element is in contact with the fixed contacting element, and an open state, in which the movable contacting element is spaced apart from the fixed contacting element. The switching device further includes an electromagnetic switching drive with a coil for generating a magnetic field and a magnet anchor, a guide sleeve to guide the movement of the magnet anchor in the magnetic field of the coil, a pyrotechnic propellant charge located in the cavity, and a supporting device for supporting the guide sleeve. The magnet anchor is arranged within the guide sleeve such that a cavity is formed below the magnet anchor.

The invention relates to medium- or high-voltage, gas-insulated electrical apparatus (10) comprising: a hermetically sealed chamber (12) filled with a dielectric gas, the gas containing at least one of fluoronitrile, carbon dioxide, dinitrogen or dioxygen; at least two electrical contacts (16, 20) arranged coaxially with a main axis (A) of the chamber (12), of which at least one (20) can move axially inside the chamber (12) between a closed position in which the two contacts (16, 20) are in electrical contact with one another and an open position in which the contacts (16, 20) are located at a distance from one another; and a cut-off mechanism (14) for extinguishing the electric arc that forms between the two contacts (16, 20) as the at least one moving contact (20) moves from the closed position into the open position. The cut-off mechanism is of the rotating arc type.

The invention relates to medium- or high-voltage, gas-insulated electrical apparatus (10) comprising: a hermetically sealed chamber (12) filled with a dielectric gas, the gas containing at least one of fluoronitrile, carbon dioxide, dinitrogen or dioxygen; at least two electrical contacts (16, 20) arranged coaxially with a main axis (A) of the chamber (12), of which at least one (20) can move axially inside the chamber (12) between a closed position in which the two contacts (16, 20) are in electrical contact with one another and an open position in which the contacts (16, 20) are located at a distance from one another; and a cut-off mechanism (14) for extinguishing the electric arc that forms between the two contacts (16, 20) as the at least one moving contact (20) moves from the closed position into the open position. The cut-off mechanism is of the rotating arc type.

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.

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.