Abstract: An electrical connector includes an insulating body, a first installation module and a second installation module. The first installation module includes a first internal circuit board and a first terminal adapter block. The second installation module includes a second internal circuit board and a second terminal adapter block. The first internal circuit board and the first terminal adapter block include first fool-proof portions that cooperate with each other. The second internal circuit board and the second terminal adapter block include second fool-proof portions that cooperate with each other. The first fool-proof portions are different from the second fool-proof portions, thereby preventing the first terminal adapter block from being incorrectly connected to the second internal circuit board, and preventing the second terminal adapter block from being incorrectly connected to the first internal circuit board.

Abstract: A plug connector includes a plug head, a plug terminal module, a locking member and a retaining body installed on one side of the plug connector. The plug terminal module includes a number of first plug terminals and a number of second plug terminals. The first plug terminals and the second plug terminals have a same structure and number. The first plug terminals and the second plug terminals are symmetrically arranged on opposite sides of the plug connector head.

Abstract: A receptacle connector includes an insulating portion, a receptacle terminal module mounted to the insulating portion, a metal shell enclosing the insulating portion, and a receptacle circuit board. The insulating portion includes a receiving space and a mating space extending from the receiving space. The mating space extends through the insulating portion to form a mating port. The receptacle terminal module includes a first terminal module and a second terminal module. The first terminal module and the second terminal module have a same structure, and are symmetrically arranged on opposite sides of the mating space. The first terminal module and the second terminal module are electrically connected to the receptacle circuit board.

Abstract: An electrical connector includes an insulating body, a first installation module and a second installation module. The first installation module includes a first internal circuit board and a first terminal adapter block. The second installation module includes a second internal circuit board and a second terminal adapter block. The first internal circuit board and the first terminal adapter block include first fool-proof portions that cooperate with each other. The second internal circuit board and the second terminal adapter block include second fool-proof portions that cooperate with each other. The first fool-proof portions are different from the second fool-proof portions, thereby preventing the first terminal adapter block from being incorrectly connected to the second internal circuit board, and preventing the second terminal adapter block from being incorrectly connected to the first internal circuit board.