Abstract: A method for operating a protective apparatus and a protective apparatus, in particular a self-tripping explosive fuse, wherein the protective apparatus includes a fuse element, which is designed to interrupt a conductor section by an explosion. A tripping unit is designed to trip the explosion by an ignition voltage (UZ) when the ignition voltage exceeds a prescribed value. The protective apparatus has a thermoelectric element, which generates the ignition voltage (UZ) depending on heating of the conductor section.

Abstract: A high voltage/high current air break switch, the switch including a support frame and a blade pivotally supported by the support frame, so as to be pivotable relative to the support frame. The blade includes a load interrupter between a blade support and the distal end of the blade. And a method of operating an air break electrical switch with a swinging blade mounted on a support and having blade contacts brought into and out of engagement with a terminal with terminal contacts, and a load interrupter with contacts in a vacuum bottle, the method steps comprising turning the support to move the blade relative to the terminal, then turning the support to move the vacuum bottle electrical contacts and to move the blade contacts relative to the terminal contacts.

Abstract: Device, circuit, system, and method for contact sequencing are discussed. An electrical circuit includes a first pair of terminals adapted to be connected across a first set of switchable contacts, and a second pair of terminals adapted to be connected across a second set of switchable contacts that are coupled to an arc suppression circuit. A controller circuit is coupled to the first and second pairs of terminals and is configured to sequence activation or deactivation of the first and second sets of contacts based on a contact control signal. A first power switching circuit is coupled to the first pair of terminals and the controller circuit. The first power switching circuit is configured to switch power from an external power source and to trigger the activation or the deactivation of the first set of switchable contacts based on a first logic state signal from the controller circuit.

Abstract: A switching electrical power contactor having a bi-blade type switch, has ferrous plates attached to the blades to increase the current carrying capacity and reduce the resistance of the switch. The contacts of the switches are arranged in pairs with at least one pair of contacts being arranged to close before another pair of contacts.

Abstract: A switching electrical power contactor having a bi-blade type switch, has ferrous plates attached to the blades to increase the current carrying capacity and reduce the resistance of the switch. The contacts of the switches are arranged in pairs with at least one pair of contacts being arranged to close before another pair of contacts.

Abstract: An exemplary switching device connects and disconnects a power line to and from, respectively, at least an associated electrical load. The switching device includes at least one phase of the switching device having a housing that includes a movable contact configured to be coupled to and separated from a corresponding fixed contact, wherein the at least one phase of the switching device includes an electrically semiconducting assembly having an insulating support operatively associated with a plurality of semiconductor devices, wherein the plurality of semiconductor devices are connected in series and are electrically connected to said fixed contact and to said movable contact, and wherein the semiconducting assembly is configured to be installed into the housing to surround at least a portion of at least one of said fixed contact the movable contact when it is coupled to the fixed contact.

Abstract: A circuit breaker for breaking an AC current, including a pair of breaker contact members with a first breaker contact member and a second breaker contact member, wherein the pair of breaker contact members is separable, whereby an arc carrying an arcing current develops between the breaker contact members; an arcing contact member configured for letting an arc root of the arc jump from the second breaker contact member to the arcing contact member, whereby the arcing current is commuted from the second breaker contact member to the arcing contact member, the commuted arcing current having a first direction; and a current-rectifying element electrically connected to the arcing contact member and configured for passing the commuted arcing current having the first direction, and for blocking a current having a second direction opposite to the first direction.

Abstract: Device, circuit, system, and method for arc suppression. A contact separation detector is configured to output an indication of a separation state of a pair of electrical contacts. A contact bypass circuit, coupled to the contact separation detector, is configured to provide an electrical bypass between the pair of contacts based on the indication.

Abstract: System and method for arc suppression. An electrical contact includes a pair of contacts configured to couple a power source to a load. An arc suppressor, coupled to the electrical contact, includes a contact separation detector configured to output an indication of a separation state of the pair of electrical contacts and a contact bypass circuit, coupled to the contact separation detector, configured to provide an electrical bypass between the pair of contacts based on the indication as provided by the contact separation detector.

Abstract: A device, circuit, system, and method for arc suppression is described. A processor, including an input terminal and an output terminal, is configured to output pulses on the output terminal based on an indication at the input terminal of a separation of a pair of electrical contacts. A contact bypass circuit, coupled to the output terminal and in parallel with the pair of electrical contacts, is configured to provide an electrical bypass between the pair of electrical contacts based on the plurality of pulses as generated by the processor.

Abstract: An electrical switching device and method are disclosed. The electrical switching device can include two movable contacts. During opening of the switching device, the two movable contacts move in a first direction until one of the movable contacts engages a blocking member. The other movable contact continues in the first direction, effecting opening of the switching device. In a particular implementation, the movable contact that engages the blocking member “bounces” in a second direction after contacting the blocking member. This causes the contacts of the switching device to be separated very quickly, reducing electrical arcing during opening of the switching device.

Abstract: Provided herein is a power transmission mechanism of a four poles circuit breaker in which the contact points of a neutral pole thereof are brought into contact earlier at the time of closing and separated later at the time of opening than those of the other poles thereof, and according to the present invention, there is disclosed a power transmission mechanism of a four poles circuit breaker comprising: a switching shaft configured to provide a driving force for switching to the movable contactors of the poles; an arm provided to correspond to the four poles to transfer the rotational torque of the switching shaft; and a link configured to transfer the rotational torque of the arm to the movable contactor as a switching force, and provided to correspond to the four poles, wherein the sum of the length of the arm and the link in a neutral pole is longer than the sum of the length of the arm and the link in the poles excluding the neutral pole.

Abstract: A miniaturized direct-current switch with which power loss is reduced when establishing continuity of a direct-current path is provided. The direct-current switch includes an electronic open/close switch inserted in a direct-current path along which a direct current flows in order to make the direct-current path an open circuit or a closed circuit, a parallel mechanical open/close switch connected in parallel to the electronic open/close switch, and a switch control circuit that controls the opening or closing time difference mutually between the parallel mechanical open/close switch and the electronic open/close switch, wherein the switch control circuit makes the parallel mechanical open/close switch a closed circuit a predetermined time after the electronic open/close switch has been made a closed circuit.

Abstract: Soldering can be performed in a state where the temperature in an object zone is stable, regardless of the heat capacity of a soldering object. A soldering device includes: a position calculation unit which calculates the position of a heated object according to operational information of a conveyer which sequentially transfers the heated object into a plurality of zones for heat processing communicated with each other; a heat capacity calculation unit which calculates the heat capacity of the heated object; and a temperature management unit which controls the temperature in an object zone into which the heated object is carried, upon receiving positional information from the position calculation unit. The temperature management unit feedforward-controls the temperature in the object zone by adjusting the heat capacity of the object zone according to the heat capacity calculated by the heat capacity calculation unit.

Abstract: A load disconnecting circuit is disclosed with a housing that has a first housing section, which houses the drive, and has a second housing section, which houses a fixed contact element and a longitudinally extended moving contact element. The second housing section has a longitudinal extension adapted to the moving contact element. Field-control rings are placed on the second housing section while encircling it, of which the first are arranged in the vicinity of the fixed contact element and the second are arranged in the vicinity of the switch-off position of the moving contact element. Via a respective connection conductor, the first field-control ring is connected to the potential of the fixed contact element, and the second field-control ring is connected to the potential of the moving contact element when in its switch-off position.

Abstract: An alternator disconnector circuit-breaker of the invention includes a cylindrical cam (40) for optimizing the sequence for opening/closing the switch-over first switch (10), the circuit-breaker second switch (20), and the disconnector third switch (30). The cam (40) has a cylindrical wall in which three slots (42), and preferably three pairs of slots, of different shapes, are defined; an end element of an element driving a respective one of the switch contacts is mounted to slide in each slot.

Abstract: An electromechanical/solid-state AC relay has an electromechanical winding coil that moves an armature to force mechanical contacts to open or close. Electrical arcing across the mechanical contacts that occur as the contacts are opening or closing can damage and severely reduce the lifetime of the relay. Contact arcing is prevented by pulsing a triac on for a short period of time just before and after the mechanical contacts make or break contact. The triac limits the voltage difference across the mechanical contacts to less than one volt to prevent arcing. The triac is turned off after the mechanical contacts finish moving, reducing the heating and average power through the triac. A zero-sampling circuit that detects when the AC input voltage switches across 0 volts and activates a control integrated circuit to switch on the triac during zero-crossings to minimize power surges.

Abstract: A load interrupter device is provided for live front padmounted high voltage switchgear unit wherein circuit interruption is independent of the speed at which a lineman opens the switch of the switchgear. The interrupter includes an insulating body having a fixed terminal and a moveable terminal spaced therefrom which forms a part of manually operable switch structure. A conductive element within the body connected to the moveable terminal normally engages the fixed terminal. A pair of moveable conductive members are also provided in the body, with one of the conductive members normally engaging a contact electrically connected to the first terminal, while the second member is joined to the second terminal for movement therewith.