In this paper, DC breaking experiments were carried out in the range of 10 to 100 A by using simple arc-quenching device. The influence of the circuit inductance on arc breaking time are discussed. DC arc quenching device is connected to DC power source of 100 V through resistance $R$, inductance $L$ and switch S. In the experiments, the anode separates from the cathode at a time of $t=0$ ms and subsequently moves upward with an average velocity of around 1.2 m/s by electromagnetic coil. The maximum distance between electrodes is 30 mm which is reached at $t=28$ ms. Inductors of 0, 1.2 and 3 mH are inserted into a circuit. The major achievement in this study are as follows. (a) The arcing time is longer in the case of $L=3$ mH than that of $L=0$ mH. (b) The DC current-limiting interruption might be successfully accomplished by realizing the arc voltage which is higher than the power supply voltage. (c) Even if the arc column was lengthened by the Lorenz force, it is found by estimating the actual arc length that arc column per unit length has the unique transient behavior.
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