A triggerable spark gap, a switching circuit and a method for manufacturing a triggerable spark gap are disclosed. In an embodiment, a triggerable spark gap includes a trigger electrode, an adjacent electrode at the trigger electrode, a counter electrode and a gap between the counter electrode and the adjacent electrode, wherein a distance between the trigger electrode and the adjacent electrode is less than a distance between the trigger electrode and the counter electrode, wherein the distance between the trigger electrode and the counter electrode is less than a distance between the adjacent electrode and the counter electrode, wherein the counter electrode and/or the adjacent electrode includes a first phase including a first material and a second phase including a second material, and wherein the second material has a lower electron work function than the first material.

To obtain an impact wave by generation of arc discharge between a high-voltage-side electrode 31 connected to a high-voltage-side terminal of a pulse power generating device and a low-voltage-side electrode 32 grounded or connected to a low-voltage-side terminal of the power source. One of the high-voltage-side electrode 31 or the low-voltage-side electrode 32 is an annular electrode formed in an annular shape, the other electrode is a core electrode arranged inside the annular electrode, and arc discharge is generated between an inner peripheral portion of the annular electrode and an outer peripheral portion of the core electrode.

To obtain an impact wave by generation of arc discharge between a high-voltage-side electrode 31 connected to a high-voltage-side terminal of a pulse power generating device and a low-voltage-side electrode 32 grounded or connected to a low-voltage-side terminal of the power source. One of the high-voltage-side electrode 31 or the low-voltage-side electrode 32 is an annular electrode formed in an annular shape, the other electrode is a core electrode arranged inside the annular electrode, and arc discharge is generated between an inner peripheral portion of the annular electrode and an outer peripheral portion of the core electrode.

A spark plug is provided which includes a hollow cylindrical center electrode disposed inside a metal shell and a ground electrode joined to the metal shell. The ground electrode has an inner peripheral surface facing an outer peripheral surface of the center electrode. At least one of the outer periphery of the center electrode and the inner periphery of the ground electrode has formed therein at least one recess whose ends lies in a center-to-ground electrode facing region where the outer peripheral surface of the center electrode faces the inner peripheral surface of the ground electrode in a radial direction of the center electrode. This decreases voltage required by the spark plug to achieve discharge.

A spark plug is provided which includes a hollow cylindrical center electrode disposed inside a metal shell and a ground electrode joined to the metal shell. The ground electrode has an inner peripheral surface facing an outer peripheral surface of the center electrode. At least one of the outer periphery of the center electrode and the inner periphery of the ground electrode has formed therein at least one recess whose ends lies in a center-to-ground electrode facing region where the outer peripheral surface of the center electrode faces the inner peripheral surface of the ground electrode in a radial direction of the center electrode. This decreases voltage required by the spark plug to achieve discharge.

An arrester such as an arrester for protection against overvoltages is disclosed. In an embodiment an arrester includes a housing configured to act as an external electrode, a central electrode arranged completely within an inner region of the housing, a discharge region arranged between the central electrode and the housing, a ceramic body separating the housing and the central electrode, wherein the ceramic body is arranged in an offset manner relative to the discharge region and a shielding element arranged on an inside of the housing, and wherein the shielding element extends over an entire longitudinal extent of the central electrode along the inside of the housing.

An arrester such as an arrester for protection against overvoltages is disclosed. In an embodiment an arrester includes a housing configured to act as an external electrode, a central electrode arranged completely within an inner region of the housing, a discharge region arranged between the central electrode and the housing, a ceramic body separating the housing and the central electrode, wherein the ceramic body is arranged in an offset manner relative to the discharge region and a shielding element arranged on an inside of the housing, and wherein the shielding element extends over an entire longitudinal extent of the central electrode along the inside of the housing.

The present disclosure relates to a spark plug for engines. The spark plug includes a center electrode and a ground electrode that includes a center void and a ground void respectively. An initial spark gap is formed between the center electrode and the ground electrode. A center electrode initial surface is disposed between the center void and the spark gap and a ground electrode initial surface is disposed between the ground void and the spark gap. The center void and ground void can become exposed through wear of the center electrode initial surface and ground electrode initial surface respectively. When the wear breaches center electrode initial surface and the ground electrode initial surface the wear creates a center first concentration edge and a ground first concentration edge that focus an electrical field and reduces the voltage required for fuel breakdown.

An electronic apparatus and an overvoltage protection structure thereof are provided. The overvoltage protection structure includes a first signal transmission end and a second signal transmission end. The first signal transmission end has at least one first side, and couples to a protected component through a conductive wire. The second signal transmission end has at least one second side, wherein the at least one second side corresponds to the at least one first side and is adjacent to the at least one first side. Therein, there is at least one gap between the at least one second side and the at least one first side, and the gap is positively related to a threshold voltage of the overvoltage protection structure.

An electronic apparatus and an overvoltage protection structure thereof are provided. The overvoltage protection structure includes a first signal transmission end and a second signal transmission end. The first signal transmission end has at least one first side, and couples to a protected component through a conductive wire. The second signal transmission end has at least one second side, wherein the at least one second side corresponds to the at least one first side and is adjacent to the at least one first side. Therein, there is at least one gap between the at least one second side and the at least one first side, and the gap is positively related to a threshold voltage of the overvoltage protection structure.