These instructions give you basic electromagnetic force on an arcing contact is one of the principal factors in designing large-capacity and small-sized high current contact systems of circuit breakers, disconnectors or isolated switches. Butt contacts, such as those in vacuum interrupters, tulip contacts structured from a rod contact and fingers are adopted widely in gas circuit breakers. In this paper, results of the detailed evaluation of current distributions and electromagnetic forces are described with three-dimensional electromagnetic field analysis were applied to a finite element model of a butt and tulip contacts.