A switch includes: switch blades for multiple phases which perform three-position switching among ON, OFF, and ground, using a rotation shaft; and phase-to-phase connection mechanisms which support the switch blades for the phases so as to be insulated among the phases and against the ground, and which connect the switch blades for the phases and cause them to cooperate with each other. The phase-to-phase connection mechanisms include fitting couplings made of an insulating material and each composed of a large-diameter endless frame body and a small-diameter endless frame body which are fitted to each other. The fitting couplings are arranged on the same axial line.

The invention relates to a high-voltage or medium-voltage switching system comprising at least one switching unit 1, which has a rotary switch 1A and a drive unit 10 for rotating the rotary switch, the drive unit 1 having a drive motor 9. The drive unit 1 has an actuation unit for actuating the drive motor 9, which is formed in such a way that when the drive motor 9 is operated the rotary switch 1A adopts a plurality of predetermined switching positions. The actuation unit has a switching member 17 for switching the drive motor 9 on and off and a rotatable body 16, as well as an activation element 18, which cooperates with the rotatable body 16, for activating the switching member 17. The activation element 18 and the switching member 17 ensure, together with the rotatable body 16, that the drive motor 9 is only switched on and off in particular rotational positions which correspond to particular switching positions of the switching unit 1, in such a way that the different switching positions can be approached highly precisely.

Devices, systems and methods are provided to improve communication of switch sensor and status signals between a medium voltage overheard switchgear and an intelligent electronic device (IED). A switchgear interface device is deployed proximally to a switchgear and/or junction box situated at a distal end of a utility pole. The switchgear interface device (SID) receives, processes and combines sensor signals and status signals from switches in the switchgear with metadata for transport as digital signals to an IED mounted at the other end of the utility pole. The cabling for sensor and status signals between the SID and the IED can be fiber or Ethernet. The digital signals can be formatted using the IEC61850 standard. The SID can have drive electronics and send open and close command signals to the switches to eliminate the need for a multi-pin connector cable for transport of switch power signals from the IED.

A switch includes a first contact and a second contact that are placed along an operating shaft and can reciprocate with respect to each other. An end of the second contact opposite to an end thereof on the side of the first contact is housed in a housing space of a housing box. The pressure in the housing space is increased due to an arc generated when the first contact approaches the second contact. The increased in the pressure causes the second contact to move toward the first contact.

A switch, in particular a grounding switch, is for quickly establishing a ground connection and for extinguishing an arc fault for a switching system. The grounding switch includes at least one fixed contact having a first cable feed, a moving contact, a contact guide having a second cable feed, and a mechanical energy store. In the opened state, an insulating distance between the fixed contact and the moving contact, is filled with insulation liquid, at least in part. The switch further includes a triggering device and a locking mechanism.

Gas-insulated electrical switchgear for medium and high-voltage electrical distribution networks that allows configuring different electrical diagrams and that basically consists of a first gas-insulated enclosure (1) and is equipped with at least one electrical connection means (2, 3) and at least one mechanical connection means (4), a second enclosure (11) housed inside the first enclosure (1) and an operating means (5) integrated inside a second enclosure (11) which in turn comprises a gas breaking switch, an actuating element (8) configured to actuate the operating means (5) that performs the functions of breaking, making, disconnecting and grounding, and an operating mechanism (9) to produce actuation of the actuating element (8).

A motor control center includes an enclosure comprising an isolation switch, a main contactor device, and a ground switch device. The isolation switch is selectively manually operable between a connected state and a disconnected state. In the connected state the isolation switch is adapted to conduct electrical power from an associated power source to the main contactor device and wherein the isolation switch in the disconnected state interrupts conduction of electrical power from the associated power source to the main contactor device. The main contactor device is selectively operable between a conductive state and a non-conductive state, wherein the main contactor device is adapted to electrically connect the isolation switch to the ground switch device and to an associated electrical load when the main contactor device is in its conductive state and wherein the main contactor device disconnects said isolation switch from the ground switch device and the associated electrical load when the main contactor device is in its non-conductive state. The ground switch device is manually operable from an open, ungrounded state in which the main contactor device is electrically disconnected from a ground path to a closed, grounded state in which the main contactor device is electrically connected to the ground path. The motor control center further includes an interlock device operably connected between the isolation switch and the ground switch device, wherein the interlock device prevents movement of the isolation switch from the disconnected state to the connected state when the ground switch device is in the grounded state.

According to an embodiment of the present invention, there is provided a switchgear including: a fixed electrode which is disposed inside a cabinet; a movable electrode which is provided corresponding to the fixed electrode and rotates between a first position which comes in contact with the fixed electrode and a second position which is separated from the fixed electrode; a pedal which is disposed on the outside of the cabinet and guided in the vertical direction along a guide hole formed long in the cabinet in the vertical direction; a connecting rod which is rotatably connected to the pedal; and a hammer which is connected to the connecting rod and rotates together with the connecting rod to strike the movable electrode positioned at the first position.

A switch including a housing, a first contact arrangement having a first commutation contact element and a first contact, a second contact arrangement having a second commutation contact element and a second contact, and also a nominal contact arrangement. The first commutation contact element and the second commutation contact element form a snap-action connection with one another in the closed position of the commutation contact element. When the switch is closed, a distance between the first contact and the second contact is smaller than a distance between the first commutation contact element and the second commutation contact element in the direction of the axis.

A disconnector or earthing switch for connecting three conductors of different phases to a respective switching tube, including a rotatable drive shaft including a worm and configured for operating the disconnector or earthing switch, the three respective switching tubes, which are arranged axially together movable between a connected position configured for connecting the three conductors and a disconnected position configured for not connecting the three conductors, a partially toothed worm wheel configured for translating a rotation of the worm into the axial movement of the three switching tubes between the connected position and the disconnected position, whereby the partially toothed worm wheel is unengaged with the worm in the connected position and the disconnected position, and a re-engagement device configured for again engaging the partially toothed worm wheel with the worm in the connected position and the disconnected position.