Abstract: A connector is disclosed in this invention, comprising a connector body, a first terminal set, a second terminal set, and a third terminal set. The connector body comprises accommodating space, the accommodating space comprises a plug-in socket near one end of the connector body, and a side wall of the accommodating space close to the plug-in socket of the connector body is extended internally to form a protrusion. The first terminal set is installed inside the accommodating space and located near the other terminal of the connector body. The second terminal set is installed inside the accommodating space and located near the terminal of the connector body. The third terminal set is installed inside the accommodating space and located near the terminal of the connector body, and the second terminal set and the third terminal set are located at two sides of protrusion, respectively.