Arc extinguisher set switch box mold.; arc extinguisher assembly for a switch with mold box capable of reducing the time to extinguish the arc and prevent the contacts are damaged due to a reversal of a bow is provided. For this purpose, the extinguisher assembly bow for a switch box mold having a fixed contactor and a movable contactor in the housing, includes a number of grids made of a ferromagnetic material, each of which has a portion forming recess to allow movement of the movable contactor, laminated form surrounding contacts movable contactor and the fixed contactor and installed in the housing to divide an arc when the arc between the fixed contactor and the movable contactor is generated, and plate grid support including portions of outer wall supporting grids and portions disposed adjacent inner wall contacts the movable contactor and the fixed contactor and compressing an arc to be narrow, the supporting plate grid being installed so having a horizontal U-shaped section with an opening facing the opposite side contacts.
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