A switch-fuse module and a ring main unit. The switch-fuse module includes: at least one fuse; and at least one fuse canister having the fuse inside; the security device including: at least one slider configured to linearly move between an open slider position and a closed slider position; at least one earthing switch that i) is galvanically connected to an end of the fuse, ii) is operable between an open and a closed state, iii) is designed to earth the end of the fuse in the closed state, and iv) is coupled to the slider in such a manner that the open slider position effects the open state of the earthing switch and the closed slider position effects the closed state of the earthing switch; an energy-storing propulsion element configured to move the earthing switch from the open to the closed state when discharging; and a locking mechanism adapted for blocking access to the fuse in a locked state and for releasing access to the fuse in an unlocked state, wherein the slider is coupled to the locking mechanism in such a manner that the slider is in the closed slider position while the locking mechanism is in the unlocked state, so that the fuse may only be accessed if it is ensured that the fuse is earthed.

A fuse adapter kit for a fuse of a switch-fuse module and a switch-fuse module. The fuse adapter kit includes: a fuse canister having an axially elongated fuse receiving portion adapted to receive the fuse; and at least one terminal having i) an axial fuse receiving opening for receiving an axial end portion of the fuse, ii) a lateral protrusion forming a mechanical male connector, and iii) an electrical terminal connector laterally arranged within the mechanical male connector for electrically connecting the fuse to an electrical canister connector; wherein the fuse canister has a fuse mounting wall portion extending axially along a back side of the fuse receiving portion, the fuse mounting wall portion having at least three fuse mounting openings at different axial positions along the fuse mounting wall portion, each of the fuse mounting openings forming a mechanical female connector matching the mechanical male connector of the terminal to form a mechanical plug connection, and wherein the fuse canister further includes the electrical canister connector arranged at at least one of the fuse mounting openings for electrically connecting to the electrical terminal connector.

A switching apparatus is provided herein. The switching apparatus includes: (i) a first pole terminal, a second pole terminal and a ground terminal, (ii) a first contact arrangement including a first fixed contact member and a first movable contact member, (iii) a second contact arrangement including a second fixed contact member and a second movable contact member, (iv) a vacuum chamber wherein the second fixed contact and the second movable contact are enclosed and can be coupled or decoupled, and (v) an electrically conductive coupling lever pivoted on the second movable contact member and reversibly movable about a second rotation axis.

A three-position disconnector switch includes an earthing contact, a power out contact, a power in contact, a piston, and a threaded rod. A length of the piston is such that in a first switch position an outer surface of a wall of the piston makes an electrical contact between the power out contact and the power in contact. The length of the piston is such that in a second switch position the outer surface of the wall of the piston does not make an electrical contact with either the earthing contact or the power in contact. The length of the piston is such that in a third switch position the outer surface of wall of the piston makes an electrical contact between the earthing contact and the power out contact. The piston includes an inner threaded section configured to engage with the threaded rod.

An earthing module for a switchgear includes: a cylinder; a piston; a stored energy unit; and at least one photovoltaic cell. The cylinder connects to a part of a switchgear at earth potential. The piston moves within the cylinder from a standby position to a released position along an axis of the cylinder. When in the released position, the piston is in electrical connection with the cylinder. The stored energy unit is located within or associated with the earthing module such that activation of the stored energy unit moves the piston from the standby position to the released position. One or more of the at least one photovoltaic cell activates the stored energy unit based on radiation from an electrical arc of the switchgear impinging upon the one or more of the at least one photovoltaic cell.

In a switch in which one end portion of a blade is pivotally attached to a fixed contactor and another end portion of the blade is brought into pressure contact with a fixed contactor by rotational operation of the blade, at least one slit is provided in each of a conductive contact surface, with respect to the fixed contactor, of the one end portion of the blade and a conductive contact surface, with respect to the fixed contactor, of the other end portion of the blade, so as to divide each of the conductive contact surfaces, thereby achieving multi-point contact on each of the conductive contact surfaces, and a thickness of a contact-pressure spring fixing portion of the blade at which a contact-pressure spring for bringing the other end portion into pressure contact with the fixed contactor is made smaller than that of the other end portion.

The present disclosure relates to a high speed earthing switch of a gas insulated switchgear and, more specifically, to a high speed earthing switch of a gas insulated switchgear, which includes an air blower so as to secure an improved arc interruption performance. A high speed earthing switch of a gas insulated switchgear according to an embodiment of the present disclosure comprises: an outer case; a cylinder member installed inside the outer case and having a ventilation hole formed along the lower circumferential surface; and a piston member installed to be inserted into the cylinder member, and moving backward and forward by means of a force transferred from a driving unit so as to inject air inside the cylinder member to a contact part when the cylinder member is opened.

A pole assembly of a switching device is provided. The pole assembly includes a first interrupter unit operably connected to a pole plate of the pole assembly via first post insulators. The first interrupter provides a path for current flow through the first interrupter in a closed state and interrupts the current flow in an open state. A second interrupter unit is operably connected to the first interrupter unit and to the pole plate via second post insulators. The second interrupter allows the current flow through the first interrupter unit in an open state and grounds the switching device in a closed state. The pole assembly includes a dielectric shield physically disposable between and operably connected to the first post insulators and the second post insulators for uniformly distributing an electric field generated during operation of the pole assembly.

To obtain a gas insulated switchgear which enables an improvement in maintainability. The gas insulated switchgear is characterized by including a main circuit device disposed inside a container in which an insulating gas is hermetically sealed; an operating mechanism disposed outside the container; a hermetic connecting shaft which transmits the drive force of the operating mechanism to the main circuit device; a first hermetic sealing portion disposed around the hermetic connecting shaft; and a second hermetic sealing portion which, having thereinside a hermetic sealing member, is disposed around the hermetic connecting shaft so as to be superimposed on the first hermetic sealing portion and also is provide in the atmosphere outside the container.

A potential equalization system for a modular multi-level converter. The converter has a plurality of converter modules and each of the modules has a direct current source. The potential equalization system includes pole contacts, which are each electrically connected to one pole of a direct current source, and at least one electrically conductive contacting element, which can be moved between a first end position in which the contacting element is electrically isolated from the converter modules and a second end position in which the contacting element contacts pole contacts of different direct current sources and can be put on ground potential.