Abstract: An electrical switch is intended to prevent hot arc gases from contacting the terminal screw units. The arc gases are to flow off in an already deionized manner so that no damage is caused even when they flow out towards the electric cable terminals without the need for additional shielding for the terminals. A terminal cover section is designed with blow-out channels which are fully encapsulated with respect to the terminal screws and to the terminal chambers and have an outlet aperture each. To fully encapsulate and provide access to each of the terminal screws, a location dome passes through each blow-out channel. At the points where the through apertures join the quench chambers, the inserted terminal cover section is sealed against the separating wall of the housing in the region of the blow-out channel inlet apertures. The arc gases flow from arc quenching chambers through a partition by way of passage openings.

Abstract: A low-voltage power switch having a switching chamber with a switching contact arrangement and an arc extinguishing device. Sealing of the switching chamber is achieved by an apron-like projection on the movable contact support in combination with a stationary curved recess and by ribs opposite the movable contact support and a sealing arrangement on the stationary counter-contact.

Abstract: In a miniaturized automatic circuit breaker with a casing of insulating material forming an arc-extinguishing chamber and a housing for contacts which are closed and opened and for a pair of terminals for connection to ends of leads outside the circuit breaker, one of the terminals is multifunctional and comprises a screw clamp opening in a first face of the circuit breaker in order to receive ends of external leads and spring-clip terminal opening in the rear face of the circuit breaker for receiving a blade-like terminal of an external lead, and an insulating diaphragm is interposed between the multifunctional terminal and the arc-extinguishing chamber and forms, with the casing, at least one vent duct opening in the first face and insulated electrically from the multifunctional terminal.

Abstract: An electrically insulated turbulator for use in an electrical device for automatically interrupting an overload current is a one-piece molded assembly with an arcuate portion arranged around a terminal screw and a downwardly turned flange for shielding the terminal from the ionized gases in the arc chute. The arcuate portion has several fins and spaced-apart planar portions, both of which are located in the path of the ionized gases. The planar portions have surfaces which cooperate with the fins to create a turbulent flow pattern to decrease the length of the gas flow, and thereby optimize the cooling effect on the gases and for directing the gas flow in a desired direction. The turbulator is preferably made of a gassing material which contributes to the deionizing of the gasses, which lessens the buildup of gas pressure. It also preferably has a blowout membrane in order to limit the back pressure in the device.

Abstract: Circuit breaker arc exhaust apertures in the line end of the circuit breaker case transfer arc gases from the circuit breaker interior during overcurrent circuit interruption. A flexible shield protects the circuit breaker terminal lug from arc gas contamination.

Abstract: A power switch has a pole unit with a switch contact arrangement, an arc quenching device and a flow channel. Switching gases from the arc quenching device are provided into the flow channel and, after cooling, provided to the side of the switch contact arrangement away from the arc quenching device. The entire gas chamber of the power switch is essentially sealed. The flow channel may include a valve flap and a deionising device.

Abstract: A medium-voltage substation includes at least two insulative material chambers each provided with at least one opening for the gas-tight passage of a set of three-phase busbars. Each chamber contains a three-position three-phase switch for connecting the busbars to first gas-tight electrical feed-throughs and for connecting the first feed-throughs to second gas-tight feed-throughs connected to ground. The first feed-throughs of at least one chamber are each electrically connected to a single-phase cable. The first feed-throughs of each chamber are electrically connected either to a fuse or to a pole of a circuit-breaker disposed in an insulative material compartment.

Abstract: An arc resistant enclosure including two compartments having a toggle flap which permits the two compartments to share a single exit path from the enclosure for any pressure and gases produced in either compartment.

Abstract: An improved arc-resistant switchgear enclosure is disclosed. The disclosed arc-resistant switchgear enclosure provides a cost effective structure to collect and channel the pressure and hot exhaust gases from lower compartments and safely vent these gases through the switchgear enclosure. In preferred embodiments, an internal arc chamber is formed by assembling modules and creating a void within the center of the switchgear enclosure. As multiple compartments or modules for a switchgear enclosure are connected, an arc chamber is created within the enclosure. Upon initiation of an arc fault within a particular compartment, a relief flap or cover for that particular compartment opens to channel the pressure and the gases into the internal arc chamber or directly through the top of the enclosure. Pressure and gases are vented into the internal arc chamber and flow horizontally through the arc chamber until a path to the top of the switchgear enclosure is reached.

Abstract: A circuit breaker is formed of a stationary contact member bent back into a U-shape and having a stationary contact at a bent back portion thereof, a moving contact member situated adjacent to the stationary contact member to be able to contact with the stationary contact, a plurality of grids laminated vertically with a space therebetween, and a unitary molded insulator situated around the stationary contact member. The insulator includes a pair of side walls facing to each other, and a plurality of slots arranged in the opposed side walls to vertically space apart from each other. The grids are inserted into the slots to be vertically piled when the circuit breaker is assembled. The circuit breaker can be easily assembled.

Abstract: An improved arc-resistant switchgear enclosure is disclosed. The disclosed arc-resistant switchgear enclosure provides a cost effective means to collect and channel the pressure and hot exhaust gases from lower compartments and safely vent these gases through the switchgear enclosure. In preferred embodiments, an internal arc chamber is formed by assembling modules and creating a void within the center of the switchgear enclosure. As multiple compartments or modules for a switchgear enclosure are connected, an arc chamber is created within the enclosure. Upon initiation of an arc fault within a particular compartment, a relief flap or cover for that particular compartment opens to channel the pressure and the gases into the internal arc chamber or directly through the top of the enclosure. Pressure and gases vented into the internal arc chamber flow horizontally through the arc chamber until a path to the top of the switchgear enclosure is reached.

Abstract: An arc quenching device for a circuit breaker having a stationary contact member and a moving contact member includes a magnetic element formed of an arc quenching core and a base plate. The arc quenching core includes a back wall, and two side walls extending from lateral sides of the back wall. The base plate extends substantially perpendicularly from a lower side of the back wall in a direction as in the side walls, and is fixed to the stationary contact member. The base plate includes a U-shaped magnetic driving core situated near a stationary contact point and extending upwardly from the base plate to surround the stationary contact point, and an arc horn integrally formed with the base plate and obliquely extending toward the back wall from a portion near the stationary contact point. Arc formed between the stationary contact member and the moving contact member is moved by magnetic driving force formed by the magnetic driving core to the arc quenching core to be quenched therein through the arc horn.

Abstract: A shield structure on the line side of a circuit breaker has several adjacent channels for carrying ionized gases and cables electrically connected to a line terminal assembly. The shield structure has a main portion and a stepped portion which directs the channels and, thus, the cables and the ionized gases to the rear of the circuit breaker. The main portion has sidewalls, a top wall, and inner walls which form compartments, and which communicate with the walls of the circuit breaker to enclose a pole unit for each of the line terminal assemblies.