A plug-in jumper for terminal blocks is provided for elastic engagement in openings in busbars and for electrical contact-making of the busbars of at least two junction and/or connecting terminals. The plug-in jumper includes a jumper bar having a bar strip and several plugs which are connected to the bar strip. Each plug has at least two contact legs located essentially parallel to one another, of which at least one is made elastic. The plug-in jumper makes it possible to electrically interconnect different busbars of different terminal blocks since the plugs have two contact areas which are located on top of one another for contact-making of two busbars of two junction and/or connecting terminals which are located next to one another, wherein the two busbars are located on a different planes.