Industrial Ethernet Modular Switch functions such as the rapid spanning tree protocol and fast ring detection, with which redundant network structures from all manufacturers can be realized. The Switch has the feature that the cable outlet is either conveniently placed at the front or, to save space, at the bottom- depending on what the installation situation requires. The Switch has the feature of port mirroring. The Switch has modular design, lean managed switches and connection of expansion modules to the head station. The Industrial Ethernet Modular Switch has plug in modules for TP, fibre optic, PDF/ HCS and redundancy ring network.