AN LED PLUG

The present invention relates to plug for mounting in a socket of a substrate, the socket comprising bottom and top connection sites, the plug comprising a bottom connection element complementary to the bottom connection site, the bottom connection element having a bottom inner surface and a bottom contact interface for establishing an electrical connection to the substrate; a top connection element complementary to the top connection site, the top connection element having a top inner surface and a top contact interface for establishing an electrical connection to the substrate; an assembly component separating the bottom connection element from the top connection element; a circuit board positioned between the bottom connection element and the top connection element, which circuit board has a first surface and an electrically conducting second surface and which circuit board carries an electronic component on the first surface or the electrically conducting second surface; and the electrically conducting second surface being in electric connection with the bottom inner surface and the first surface being in electric connection with the top inner surface. The plug is useful in a component fitting system.