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 .