A connector structure includes a connector body having a hollow portion and an axis. The connector body includes a male terminal extending along the direction of the axis of the hollow portion. The connector body includes a sacrificial electrode mounted either on part of the connector body or on the male terminal. The tip of the sacrificial electrode extends outwardly farther than the male terminal tip along the axis. The connector structure includes a female terminal to be fitted along the axis. The female terminal includes a first sacrificial fold and a second sacrificial fold separated by an electrode path extending along the axis of the hollow portion, such that the sacrificial electrode is positioned between the first and second sacrificial folds before the female terminal has been fitted with the male terminal. With such a construction, the connector structure can be miniaturized and simplified, and durably protected from the damage caused by an electric arc discharge.