An electrical connector including a housing, first and second contacts arranged in the housing, each of which has a fixed part engaging with a board-shaped portion of the housing and an operating part movable to the fixed part, and an actuator movable to the housing for taking up first and second stations selectively, wherein each of the first and second contacts is shaped to have substantially the same space between the fixed and operating parts thereof or between the operating part thereof and the board-shaped portion of the housing when the actuator is postured to take the first station and a circuit board is not inserted into the housing. The actuator includes a plurality of cams each engaging with one of the first and second contacts, wherein each of the cams corresponding to the first contacts and each of the cams corresponding to the second contacts are different in shape from each other.