The invention relates to a plug-in housing module and a switchgear/switchboard. The plug-in housing module is used for forming an especially explosion-proof switchgear/switchboard comprising a number of plug-in points. When the module occupies the plugged-in position thereof, it is brought into contact with electrical connection devices and is detachably fixed to carrier rails or the like of a frame of the switchgear/switchboard. The aim of the invention is to improve such a plug-in housing module in such a way that, without switching the entire panel off circuit, a plug-in housing module can be inserted into a corresponding plug-in point or removed therefrom even by an untrained person. To this end, the plug-in housing module comprises at least one switching device which is accessible from the outside for switching between a locking position and a release position and which, in the release position, can be moved out of the plugged-in position into a separation position. In the separation position, the contact with the electrical connection devices is interrupted, while maintaining a flameproof mechanical connection and the separation position is determined in relation to the plug-in point by means of an especially mechanical locking device. Once the locking device has been released, the plug-in housing module can be fully removed from its plug-in point.