Modular system having a plurality of modules that can be electrically connected to one another

A modular system, comprising:

• a plurality of modules that can be electrically connected to one another;
• a first contact-making means;
• and
• a second contact-making means;
• wherein at least two first modules from amongst the modules can be connected to one another in series,
• wherein, in a connected state of the first modules, the first contact-making means is arranged between the first modules,
• wherein a second module from amongst the modules has the second contact-making means,
• wherein the first contact-making means and the second contact-making means are configured to make electrical contact with one another,
• wherein the first contact-making means and the second contact-making means are configured, when making electrical contact with one another, firstly to connect the first modules to the second module and then to isolate the connection of the first modules from one another.