A system comprises a first plug connector module and a second plug connector module. The plug connector modules each have at least two contact elements. The first plug connector module has at least one spring link. In the unplugged state, the at least one spring link connects the at least two contact elements of the first plug connector module electrically conductively to each other. A method for plugging a first plug connector module with a second plug connector module is based on the first and the second plug connector modules being guided toward each other in the plug-in direction. A sliding element of the second plug connector module presses against at least one spring link of the first plug connector module and, as a result, the at least one spring link is brought out of touching contact with at least two associated socket contacts.