PURPOSE: To perform the reset of plural saturable reactors with a single power source by suppressing a circulating current by connecting a choke coil between the reset coils of the saturable reactors or between a reset coil and a DC power source.

CONSTITUTION: The choke coil L is connected in series with the reset coils nc of the plural saturable reactors SR1, SR2, and SR3 connected in series. By employing such constitution, the circulating current on them can be suppressed, which enables a normal reset operation for a reset current Ic to be performed. Or, the choke coils L1, L2, and L3 are connected in series with the reset coils of the plural saturable reactors SR1, SR2, and SR3 connected in parallel with a single DC power source E, respectively. In this way, the normal reset operation by normal reset currents Ic1, Ic2, and Ic3 can be performed by eliminating an adverse effect on the circulating current. Thereby, it is possible to attain the miniaturization and high efficiency of the whole circuit device using the plural saturable reactors SR1, SR2, and SR3.