A transient overvoltage protection system to be positioned in parallel with an equipment item to be protected, has at least three lines and includes three conductive branches intended to be connected to the three lines. The first and second conductive branches are equipped with first and second voltage-sensitive protection elements and are able to rise in temperature when the voltage between its terminals is higher than a voltage threshold. A thermally sensitive disconnection device comprising at least one thermofusible element in thermal contact with at least one of the first and second protection elements, is arranged so as to keep the three branches in a connected position, the thermally sensitive disconnection device having an elastic return device exerting a force tending to bring the three conductive branches to a disconnected position.

A transient overvoltage protection system to be positioned in parallel with an equipment item to be protected, has at least three lines and includes three conductive branches intended to be connected to the three lines. The first and second conductive branches are equipped with first and second voltage-sensitive protection elements and are able to rise in temperature when the voltage between its terminals is higher than a voltage threshold. A thermally sensitive disconnection device comprising at least one thermofusible element in thermal contact with at least one of the first and second protection elements, is arranged so as to keep the three branches in a connected position, the thermally sensitive disconnection device having an elastic return device exerting a force tending to bring the three conductive branches to a disconnected position.

The invention relates to an integrated component for protecting against temporary power surges and methods of manufacturing same. The component comprising: a first and a second conductive tab, each of which may be mounted on an electrical circuit; a gas discharge tube; a thermally protected varistor comprising: a varistor body, a first varistor electrode and a second varistor electrode that are positioned on either side of the varistor body, wherein the varistor body is able to rise in temperature when the voltage imposed between the first and the second varistor electrodes exceeds a voltage threshold; a thermal fuse,
wherein an electrical connection is made via the thermal fuse.

The invention relates to an integrated component for protecting against temporary power surges and methods of manufacturing same. The component comprising: a first and a second conductive tab, each of which may be mounted on an electrical circuit; a gas discharge tube; a thermally protected varistor comprising: a varistor body, a first varistor electrode and a second varistor electrode that are positioned on either side of the varistor body, wherein the varistor body is able to rise in temperature when the voltage imposed between the first and the second varistor electrodes exceeds a voltage threshold; a thermal fuse,
wherein an electrical connection is made via the thermal fuse.

A circuit breaker protects an electric low-voltage circuit, and has the function of ascertaining a level of the current of the low-voltage circuit. A mechanical separating contact unit is operated using a mechanical handle such that an opening function of contacts is switched to prevent a current flow or a closing function of the contacts is switched for a current flow in the low-voltage circuit. An electronic interruption unit is connected to the mechanical separating contact unit in series on the circuit side and which, as a result of semiconductor-based switch elements, has a high-ohmic state of the switch elements to prevent a current flow and a low-ohmic state of the switch elements for a current flow in the low-voltage circuit. The ascertained current level is compared with current thresholds and if the current thresholds are exceeded, a process for preventing the current flow in the low-voltage circuit is initiated.

A tensioning device is provided for a surge arrester having an end fitting and tensioner. The tensioning device has an axial clearance for receiving a tensioner and a region being conically tapered in axial direction to be introduced into a clearance of the end fitting being shaped for a substantially exact fit. The conically tapered region has delimitation walls defining the axial clearance for the tensioner being movable toward a clearance interior. An antifriction layer is applied to the surface of the conically tapered region. A production method for a surge arrester and a corresponding surge arrester are also provided.

A surge protection system provides surge protection to one or more circuits. Each circuit is connected to power and a surge protection module bridges the circuit such that the surge protection module absorbs surges from the power and/or the circuit. Being that, after exposure to certain amounts of surges, the surge protection modules lose effectiveness for surge protection, each surge protection module is independently removable and replaceable by a user without risk of personal injury from shock caused by making personal contact with the power and/or circuit. In some embodiments, a filter circuit is provided to filter out noise on the circuit. It is anticipated that the protection module includes indicators to inform a user that the protection circuit is operational and whether protection has been lost. Further, in some embodiments, a fuse is provided to protect the circuit from over current.

A surge protection system provides surge protection to one or more circuits. Each circuit is connected to power and a surge protection module bridges the circuit such that the surge protection module absorbs surges from the power and/or the circuit. Being that, after exposure to certain amounts of surges, the surge protection modules lose effectiveness for surge protection, each surge protection module is independently removable and replaceable by a user without risk of personal injury from shock caused by making personal contact with the power and/or circuit. In some embodiments, a filter circuit is provided to filter out noise on the circuit. It is anticipated that the protection module includes indicators to inform a user that the protection circuit is operational and whether protection has been lost. Further, in some embodiments, a fuse is provided to protect the circuit from over current.

A fusible switch disconnect device includes a housing adapted to receive at least one fuse therein, and a switchable contact for connecting the fuse to circuitry. A tripping mechanism and control circuitry are provided to move the switchable contact to an open position in response to a predetermined electrical condition.

A circuit breaker protecting an electric low-voltage circuit includes a housing with grid-side and load-side connections and a series circuit of a mechanical isolating contact unit on the grid side and an electronic interruption unit on the load side. The mechanical isolating contact unit has a handle opening and closing contacts. A current sensor unit is disposed in a conductor between the isolating contact unit and the interruption unit, for ascertaining a current level of the low-voltage circuit. A control unit is connected to the current sensor unit, electronic interruption unit, and mechanical isolating contact unit. When current and/or current/time thresholds are exceeded, prevention of a current flow in the low-voltage circuit is initiated. A power supply unit supplying energy to the circuit breaker is connected to conductors of the low-voltage circuit between the isolating contact unit and the interruption unit.