開閉電気接点の通電、接点溶融、アーク放電などの物理現象の遷移過程に、電気的等価回路の適用を検討する。凹凸のある表面の接触状態を、多数の接触点群とみなし、電気的、熟的特性に着目して、導電（抵抗）クラスター、溶融クラスターおよび電界効果クラスターへの分類を提案する。開閉動作時の電圧電流応答の複雑な実験結果を定性的に理解できる。特に、接点抵抗が増加し、接点が溶融温度に近づく（V_c=V_m)と、電気回路の条件で、金属が溶融して急激に溶断にいたる場合と、機械的変位によって金属ブリッジ形成に至る場合があることを示す。電流遮断前後は、電界効果クラスターが電子の電界放出や絶縁破壊を発生する可能性を示した。%The application of an electric equivalent circuit is examined for the transition process of physical phenomena from energizing contact to melting contact and to arc discharge during the breaking contact operation. Due to the tangency on the surface with the ruggedness, the contact is considered to consist of a lot of contacting points. The electric functions of contacting points are classified into a electric conductive (resistance) cluster, a melting cluster, and a electric field effect cluster. The electric conductive cluster would transfer to the melting cluster at Vc=Um (Vc; contact voltage, Um; melting voltage). The melting cluster would melt down or would fabricate the metal bridge, depending on the electric circuit condition. The field effect cluster showed the possibility that the field emission and/or the dielectric breakdown of the electron would occur before and after the fusion of the melting cluster.
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