Break arcs are generated in a DC48V and 12A resistive circuit. Contact resistance distribution on surfaces of the electrical contacts is measured. It is shown that different distributions of the contact resistance are obtained for the cathode and the anode. On the anode surface the resistance is higher at the center region of the anode than outer regions of the anode surface. On the cathode surface the resistance is lower at the center region of the cathode surface. Averaged contact resistance of the anode is higher than that of the cathode.%電源電圧直流48V，回路電流12Aの抵抗性負荷回路において開離時アークを発生させる．その開離時アークにさらされた電気接点の表面で，場所を変えて接触抵抗を測定する．その結果，陰極と陽極では接点表面での接触抵抗分布が異なる結果が得られた．陽極での接触抵抗は中心部が高く，陰極では中心部の接触抵抗が低い．全体的には陽極の接触抵抗が高く，陰極では低い．
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