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In the paper, a new heuristic algorithm is proposed for the sectionalizing switch placement of medium voltage overhead lines whose switches are of the same type. The objective function includes the reliability indexes of system average interruption duration (SAIDI) and expected energy not supplied (EENS). The constraints involve the maximum available investment, user reliability requirement and maximum sectionalizing switch number, etc. A general maximum product criterion of benefitted load and isolated line length, is presented to locate a single switch, and a three-phase analytical optimization algorithm is proposed for the sectionalizing switch placement of a medium voltage overhead line. A case study shows the effectiveness and practicability of the proposed analytical model and algorithm.