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Operation of a fast-operating plasma switch (PS) at the level of 200-500 kV voltages and currents of up to 150 kA is investigated. The maximum values of the voltage multiplication coefficient (pulse peaking) as compared to the source one achieve 12. It is shown, that the effect of vacuum training facilitating the basic parameter stability increase is typical of PCS structure as a whole as well as of single plasma guns. The value of single gas release, making up about 3nxcm(sup 3) per a pulse through the air or about 1nxcm(sup 3) through hydrogen, is measured. The presence of low-energy plasma gun operation regime under which the current switching conditions to the load are realized, is ascertained which reduces the quantity of gas pumped from the PS vacuum volume, and pumping means efficiency. 6 refs.; 8 figs.; 2 tabs. (Atomindex citation 22:085047)