What does the 8000 series special module mean?

In order to increase the modularity of the 8000 series, some devices have been produced in a 25x45 format (slightly larger than the standard module). These devices are installed on suitable special mounting supports (3, 4 or 5 modules) with associated plaques. Some examples of special module items include: gas detectors, thermostats, interlocked sockets, EDP sockets, portable electronic torches, UNIVERSAL SECURITY plugs and P30 outlets. The use of the special module items does not completely exclude the choice of functions available with standard modules, they can in fact be combined using the 08491 adapter on the same mounting support in special module enclosures IP40 and IP55 for the 8000 series.