A jumper that has a housing and is used for bridging two modular electric terminals which are arranged next to one another and are each equipped with a busbar. At least one opening is formed in the busbars. In order to be able to easily actuate the jumper according to the invention and flexibly and easily insert the same into multiple modular terminals, two mutually insulated contact elements are arranged in the housing so as to engage into an opening in a respective busbar, and a jumper rail is movably retained in the housing. The jumper rail, which has two contact zones and a connection zone that connects the contact zones, can be moved from a first final position in which the contact zones do not contact the contact elements into a second final position in which the contact elements are interconnected in an electrically conducting manner via the jumper rail.