The FAST-Bus arc protection device provides fast protection for medium and low voltage busbars in substations, power plants, industrial enterprises and other applications. When an arc short circuit occurs, the arc short circuit covered by the arc sensor can be quickly positioned, and the arc light protection system operates quickly, cutting off the fault current, and minimizing the damage of the arc light to the equipment and personal injury. The FAST-Bus arc light protection system adopts the principle of arc detection and current detection double criterion, and has the characteristics of fast protection action and high reliability. RIZNER-FAST-BUS arc protection system includes main unit RIZNER-FAST-BUS, satellite device FAST-1S (arc current satellite device), FAST-2S (arc satellite device), arc sensor, connecting fiber and so on.