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Current signal inspection is an effective method to determine whether fault arcs occur in a low-voltage distribution line. Current signals are sampled by an ADC converter. Using current signals as the characteristic, differences between the rising rates, sampling times and magnitudes of two current waveforms are used as the judging conditions of fault arcs. To verify the feasibility and effectiveness of the arc fault detection algorithm in time domain by hardware, the algorithm was implemented on an STM32 platform, and a prototype of a fault arc detection device was designed. The prototype acquires current signals, performs zero-crossing detection, and achieves series arc fault recognition. In the experiment which uses fluorescent lamps, switch power supplies and vacuum cleaners as shielding loads, the device can detect series fault arcs and perform high-reliability, with avoidance of misjudgments when no arc occurs.