US Patent 7377821 Electrical connector

An electrical connector comprises an insulating housing defining a receiving space with an inserting port, a pair of guiding slot on two lateral sides of the receiving space and a plurality of first and second contact receiving channels, and a plurality of signal and power contacts respectively received in the first and the second contact receiving channels. The insulating housing has at least one protruding portion in front of the second contact receiving channel, a distance between the protruding portion and an opposed face of the insulating housing is narrow than a dimension of the guiding slot in a vertical direction to prevent a guiding post of a complementary connector from inserting into the second channel by mistake.