Plug connector system and protective device for optical plug connectors

An optical plug connector system, comprising:

• a socket part, adapter part or coupling part, the socket part, adapter part or coupling part comprising a socket housing;
• a plug part comprising a plug portion, wherein an inside of the socket housing defines an inner space, into which the plug portion may be introduced, by which means a releasable plug connection may be created between the socket part, adapter part or coupling part, and the plug part;
• and
• a switch device, by way of which a radiation power led to at least one of the plug part and the socket part, adapter part or coupling part, may be reduced or switched off, when the plug connection is released, the switch device comprising a first element being part of or being fastened or fastenable to the socket part, adapter part or coupling part, and the switch device comprising a second element being part of or being fastened or fastenable to a portion of the plug part, which portion is different to the plug portion, wherein the switch device may be actuated in that the first and the second element cooperate.