[en] There is an increasing demand for reliable and fast high-voltage switches in the field of pulsed-power technology, especially in accelerator technology. Low-pressure gas discharge switches (e. g. thyratron or pseudospark switch) using only one gap are limited to voltages up to about 35 kV. Multigap thyratrons are commercially available for voltages up to 200 kV for many years. On the other hand, Multigap Pseudospark switches are still at the beginning of their development. The intention of this work was to evaluate the suitability of multigap pseudospark switches for switching the kickermagnets of the projected SIS 100/300 heavy ion synchrotron of the GSI. The requirements for these switches include a hold-off voltage of 70 kV, an ampacity of around 6 kA with pulse durations up to 7 μs. For this application a three-stage switch will be necessary. The step in development that is presented in this work is a fundamental investigation of a two-stage prototype. From the results conclusions can be drawn for the adaptability of the pseudospark design to the projected application. The usability of a single gap pseudospark switch as a switching device for a kickermagnet was tested with very good results. The only drawback was a slightly high forward voltage of the switch due to the low current flow of several hundred amperes. Pseudosparks typically need currents above one kiloampere to reach an optimal mode of operation. Nevertheless the voltage and current development was acceptable. The switching behaviour of a two-gap switch was examined for different external circuitry with special emphasis on the triggering of such a system. Basically, two different kinds of trigger modules were compared, the highdielectric trigger and a carbon nanotube based triggersystem. The first generation of high-dielectric triggers in Erlangen suffered from an insufficient lifetime. In this work, a new generation of these modules is presented. New and thicker materials lead to a significantly improved lifetime. The tested carbon nanotube modules provided good switching characteristic but the lifetime was limited due to the gas pressure within the switch. A commercial use of these modules is prohibited by the fast aging process. The emission of charges of all trigger modules measured by a faradaycup and by photographic measures is compared to the results obtained from the measurement of the switching characteristics. The best results have been achieved with a negative trigger pulse on the so-called trigger fingers using a high-dielectric trigger module with a 6 mm thick dielectric. The results presented in this work lead to the design of a sealed-off two stage metall-ceramic prototype built at the GSI. (orig.)