XC series electrical connectors are plug-in connectors for transmitting current, featuring fewer contact pieces and high current capacity. The arranged contact pieces are of the same size and a single color, mixed in arrangement. Terminal forms include crimping, welding, and printed circuit board styles. The wire spring socket has a wide contact area, fast current transmission, and a snap connection between the plug and socket, commonly used for signal connections between telecommunication, high-speed rail, and equipment.