1. A solid-state overvoltage protection apparatus of the type having a plurality of spaced electrodes and a body of threshold switching material disposed therebetween, said body having a high electrical resistance to provide a blocking condition for substantially blocking current therethrough at operating voltages below a first nominal voltage level and a lower electrical resistance at overvoltages above said nominal voltage level to provide a conducting condition for conducting current therethrough, the improvement comprising in combination: means for providing an elongated current conduction path of substantially uniform distance between said electrodes through said body confined to an elongated cross-sectional area of said body transverse to the direction of current flow, said cross-sectional area having an effective length along the major dimension of said area which is at least about ten times greater than the maximum effective width of said area, whereby relatively large currents associated with overvoltages which may flow therethrough are distributable over said elongated area.