Hybrid and modular plug systems for electrotechnical, electronic, optoelectrical and optical apparatuses and components; modular plugs for power, data, light signals, in particular hybrid plugs for simultaneous connection of power, data and optical liber lines; plug-in connectors; insulated electrical plug-in connectors; plug-in connectors for optical fiber lines; electrical power distributor with and without measuring units; patch panels; control panels; optical waveguides; optical fiber plug-in connectors; coaxial plug-in connectors; fiber optic cables; optical fibers; power controllers; computers; control components, for or with the aforementioned goods, in particular hybrid plugs; software for controlling hybrid plugs, distributors, patch panels; control panels for hybrid plugs.