Abstract: A movable contact mechanism of a double-breakpoint circuit breaker comprises a front static contact having a first contact point at the rear end, a rear contact assembly having a connecting plate with a rear static contact at the front end, and a movable contact which are placed in the horizontal direction, wherein an insertion slot is formed in the front end of the rear static contact the front contact end of the movable static is equipped with a second contact point matched with the first contact point, and the rear insertion end of the movable contact is inserted into or separated from the insertion slot and the opening or closing stroke of the first contact point and the second contact point is greater than the stroke that the rear insertion end of the movable contact is inserted into or separated from the insertion slot.

Abstract: A progressively contacting switch includes a set of contacts connected to an input. The set includes a first sacrificial contact formed of a first metal and a first conducting contact formed of a second metal. The switch further includes a movable set of contacts connected to an output. The movable set includes a second sacrificial contact formed of the first metal and a second conducting contact formed of the second metal. The switch includes an element configurable to connect the movable set of contacts such that the first sacrificial contact connects to the second sacrificial contact at a first time, thereby causing a current to flow from the input to the output, and while the first sacrificial contact remains connected to the second sacrificial contact, the first conducting contact connects with the second conducting contact at a later time.

Abstract: A three-phase disconnect switch for a power distribution system that supplies three-phase power from a source through a main circuit breaker to multiple three-phase feeder circuits, includes three pairs of contacts adapted for connection to the three phase lines of a selected one of the feeder circuits for opening and closing each of the phase lines, and a movable actuator associated with the three pairs of contacts and responsive to a signal indicating the occurrence of an arcing fault in the selected feeder circuit for initially creating a short circuit across the three phase lines of the feeder circuit and then opening the contacts.

Abstract: This patent document discloses high voltage switches that include one or more electrically floating conductor layers that are isolated from one another in the dielectric medium between the top and bottom switch electrodes. The presence of the one or more electrically floating conductor layers between the top and bottom switch electrodes allow the dielectric medium between the top and bottom switch electrodes to exhibit a higher breakdown voltage than the breakdown voltage when the one or more electrically floating conductor layers are not present between the top and bottom switch electrodes. This increased breakdown voltage in the presence of one or more electrically floating conductor layers in a dielectric medium enables the switch to supply a higher voltage for various high voltage circuits and electric systems.

Abstract: A circuit breaker having an arc extinguishing mechanism includes a plurality of grids disposed in a longitudinal direction, each having protruding portions at both ends thereof so as to define a space therebetween, a fixing portion to support the grids, insulating plates fixed to both sides of the grids, a stator located below the grids, the stator including an arc runner and a stationary contact disposed at an upper side of the arc runner, and a mover contactable with or separated from the stationary contact with moving up and down within the space, wherein an interval between the insulating plates within the space is shorter than a width of the mover.

Abstract: Sealed chamber for monitoring pressure 23 is provided on sealed tank 37. Sealed tank 37 is filled with insulating gas. And, a connection using insulated pipe 19 is provided between medium-pressure space 18 that makes a medium pressure and sealed chamber for monitoring pressure 23. In sealed chamber for monitoring pressure 23, a pressure monitoring and controlling means is provided for monitoring the internal pressure thereof to activate the pressure-release control in response to the situation where the monitored internal pressure has reached the predetermined setting value. The pressure monitoring and controlling means includes solenoid valve 28 that is capable of opening sealed chamber for monitoring pressure 23 to the atmosphere, pressure detector 26 that detects the internal pressure, and pressure monitor 27, which activates solenoid valve 28 for pressure-release when pressure detector 26 detects that the internal pressure has reached the predetermined abnormal pressure value.

Abstract: A double break vacuum interrupter includes a first contact system with an annular stationary contact, which is engaged by a primary moving contact with the moving contact rod extending through the primary moving contact and through the opening of the annular stationary contact. A second contact system includes a secondary moving contact disposed on an end of the moving contact rod, which engages and operates a floating contact on the same axis. Both contact systems are enclosed in a sealed envelope. A mechanical adjustment system is provided for the floating contact, which controls its range of motion. The mechanical adjustment system allows the first and second contact systems to engage at approximately the same time. A system of capacitors and resistors is provided to balance the voltage between the first and second contact systems to provide more efficient interruption of the electric current.

Abstract: In one aspect, an apparatus, such as an electrical system, is provided. The electrical system can include a pair of conductors across which an arc is sporadically supported, the arc including load current from a load circuit. The electrical system can also include an energy source that is separate from the load circuit and configured to selectively charge an electrode assembly. The conductors and electrode assembly can be configured such that the arc, when present, will be lengthened or constricted due to the charge on the electrode assembly.

Abstract: An electrical switch which includes an insulative housing having a wall defining an axial bore therein, a first electrical contact disposed in the housing bore and a second electrical contact movably disposed in the housing bore between an open position and a closed position. When the contacts are in their open position, the second electrical contact is spaced apart from the first electrical contact and when the contacts are in their closed position, the second electrical contact is in electrical contact with the first electrical contact. The switch includes features to enhance safety and operation by reducing the possibility of arcing or flashover before and during the switching operation and to provide of visual indication of the state of the switch.

Abstract: An electrical switching device, especially a high-voltage circuit breaker, contains arcing contacts and nominal current contacts. At least one of the nominal current contacts has a surface formed of an arc-resistant material provided with a galvanic coating. In this configuration, the contact points can withstand high mechanical and thermal loads and at the same time maintain a high current carrying capacity.

Abstract: A contact finger module for mounting in a high-power switchgear includes at least one contact finger having a contact piece and a flexible contact piece support, which extends along a longitudinal direction and has an attachment end and a contact-making end. The contact piece overhangs the contact piece support in the opposite direction to a deflection direction, and is connected to the contact piece support at the contact-making end. The contact finger module includes at least one leaf spring, which extends along the longitudinal direction and has an attachment end at which it is connected to the attachment end of the contact piece support in the mounted state. The leaf spring can produce a force that counteracts deflection of the contact piece in the deflection direction. In the mounted state, the leaf spring can extend in the longitudinal direction at least as far as the center of the extension of the contact piece in the longitudinal direction.

Abstract: In a power switch, power-switch fingers of a rated-current switching arrangement, as well as contact fingers (25) of a tulip contact and a switching pin (14) of an arcing switch arrangement, or other parts, each comprise a base body (26, 28) which, at sections which are subjected to high thermal loads by the arc formation, bears a protective layer (27, 29) which is resistant to contact erosion and has been applied to the base body (27, 28) by plasma spraying in vacuum. This enables even complex and flexible parts to be made resistant to contact erosion. The protective layer (27, 29) which is preferably used is a mixture of at least 10% (by weight), in particular at least 50% (by weight) of high-melting metal, such as W, Mo, Ir, and lower-melting metal, such as Cu, Ag, Ti, Fe, e.g. 80% (by weight) W and 20% (by weight) Cu, while the base body used is preferably made from Cu, Ag. Fe, steel, Al or a flexible copper alloy, such as CuBe, CuCr or CuCrZr.

Abstract: A high voltage hybrid circuit-breaker has an arc circuit with a gas circuit-breaker connected in a series with a vacuum bulb. The housing is subdivided into a first compartment enclosed by an insulator for housing the primary contacts of the primary circuit and of the gas circuitbreaker and a second adjacent compartment (14) containing the vacuum bulb, defined by a conductive metallic shell. The movable arcing contact of the gas circuit-breaker is actuated with the movable primary contact by a primary control rod connected to a common mechanism, wherein the displacement of the movable arcing contact of the vacuum bulb is derived from the translational movement of the primary rod through an intermediate transmission lever received in the second compartment.

Abstract: An electrical protection apparatus is formed by association of a circuit breaker electrically connected in series with an effector. Switching of the arc onto an electrode when tripping of the mechanism occurs following a fault causes shunting of the effector. The electrode is separated from the stationary contact by an insulating gap, which is dimensioned to enhance said switching of the arc onto the electrode at the beginning of the opening travel of the movable contact, and to guarantee the dielectric withstand in the closed state of the contacts of the circuit breaker, and in the open state of the effector.

Abstract: A loadbreak switch is provided that utilizes a pivotally mounted movable jaw contact and a main stationary contact that is positioned in the middle of an arc runner. For operation at voltages 15 kV and above, the switch utilizes a shunt contact that bridges the arc runner and that is above and coplanar with the main stationary contact. A magnetic field is developed by the current that flows through a coil of wire disposed around the arc runner. This configuration when utilized in an environment of insulating gas, provides efficient extinguishing of arcs upon opening of the contacts. Further, the open jaw contact is easily visible to establish an open gap.