The arc extinguishing principle of miniature circuit breaker in DC circuits was discussed.

讨论了小型交流断路器在直流电路中的灭弧原理。

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The affect of inductance and time constant to DC arc extinguishing in DC circuits was analyzed.

分析了直流电路中电感和时间常数对直流电弧熄灭的影响。

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Welding control device adopts microcomputer for process control, arc striking, welding, arc extinguishing control, auto arc voltage control and auto tracking of welding seams.

焊接自动控制装置采用微机实现焊接过程控制，完成引弧、焊接、熄弧控制及弧压自动调节和焊缝自动跟踪。

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