A spark-gap of the invention comprises: a first body supporting a first electrode mounting connected to a first electrode having a first electrode end, a second body supporting a second electrode mounting connected to a second electrode placed so as to face the first electrode end, and a connection arm connecting the first body to the second body. The first body and the second body have a generally cylindrical outer shape and are aligned along a common longitudinal axis. The first electrode end is offset, relative to the longitudinal axis, toward the side opposite the connection arm. The invention also relates to an electric arc generation device comprising such a spark-gap.

A spark-gap of the invention comprises: a first body supporting a first electrode mounting connected to a first electrode having a first electrode end, a second body supporting a second electrode mounting connected to a second electrode placed so as to face the first electrode end, and a connection arm connecting the first body to the second body. The first body and the second body have a generally cylindrical outer shape and are aligned along a common longitudinal axis. The first electrode end is offset, relative to the longitudinal axis, toward the side opposite the connection arm. The invention also relates to an electric arc generation device comprising such a spark-gap.

An electro-static discharge protection device includes a ceramic base material, first and second outer electrodes on the outer surface of the ceramic base material, a hollow portion inside the ceramic base material, a first discharge electrode including a first end portion electrically connected to the first outer electrode and a second end portion in the hollow portion, a second discharge electrode including a first end portion electrically connected to the second outer electrode and a second end portion spaced apart from the first discharge electrode in the hollow portion, and a discharge supporting electrode including silicon carbide and between the second end portion of the first discharge electrode and the second end portion of the second discharge electrode. The elemental alkali metal in the ceramic base material is about 3 percent by weight or less.

A transient voltage protection device comprises a pair of discharge electrodes opposing each other with a gap therebetween and a discharge inducing portion in contact with the pair of discharge electrodes. The discharge inducing portion comprises a ceramic component, metal particles, and pores discontinuously scattered. The pores have an average size of 0.05 m or more and 1.04 m or less.

A transient voltage protection device comprises a pair of discharge electrodes opposing each other with a gap therebetween and a discharge inducing portion in contact with the pair of discharge electrodes. The discharge inducing portion comprises a ceramic component, metal particles, and pores discontinuously scattered. The pores have an average size of 0.05 m or more and 1.04 m or less.

One disclosed example provides a high-power switch circuit, comprising a cathode and an anode. One or more of the cathode and the anode comprises a three-dimensional graphene network. The high-power switch circuit further comprising a gap separating the cathode and the anode, a high-power voltage source electrically connected to the cathode and the anode, and a trigger device configured to selectively control triggering of an electrical current between the cathode and the anode.