An experimental investigation of the nanosecond POS (plasma opening switch) regime in a circuit with an inductor section on the WERA accelerator with a stored energy of 1 kJ was carried out. The second inductivity was varied during the experiment: 350 nH, 85 nH, and 55 nH. The pulse duration was not more than 75 ns. The plasma source and POS geometry was constant. The current amplitudes in the short circuit case were 60 kA, 116 kA, and 150 kA, and maximum voltage when the switch was opened reached 850 kV, 750 kV, and 500 kV, respectively. The load of the POS was a planar electron diode. The amplitude and pulse duration of the current in diode were, in this case, 45, 85, and 100 kA and 15, 10, and 7 ns, respectively. There was a voltage prepulse with 100 kV amplitude in the diode before the switch was opened. During this prepulse there were large energy losses.