Er, ..., Um, ..., You provided what appears to be a lot of site-specific information about some kind electrical safety device (often called a "barrier" or more commonly called an "intrisically safe barrier") used in industrial applications where there is some risk of fire or explosion which might be caused by a spark of sufficient intensity to ignite a flammable or explosive atmosphere, gas or substance. We have ZERO idea of what any of the mumbers means, nor what a Gemu project is. You didn't provide a photo of a drawing or the name of the barrier manufacturer, nor what the model number of the barrier is (it's just a bunch of numbers to us lay persons), so we can't provide a whole lot in the way of information.
BUT, using Google Search and the search term: "What is the purpose of an electrical safety barrier in industrial applications" (without the double quotation marks), the third result was this:
which is a link to a white paper on the website https://zeroinstrument.com. There were many others but this one I skimmed through and talks about the various types of intrinsically safe barriers (the more commonly-used and correct name for this type of safety device widely used in industrial applications world wide) and provides some good, basic information. In a nutshell intrinsically barriers try to limit the amount of current (and in some cases voltage as appropriate) to prevent a short or ground of some sort in the wiring between a control system input or output and the field device which may be in a hazardous location where a spark could be catastrophic or even deadly.
You can use your own preferred World Wide Web search engine/application and get more details and in-depth descriptions if needed. I would also suggest obtaining the intrinsically safe barrier's manufacturer name and model number and looking at the manufacturer's website for a data sheet about the device in question which will probably have some useful information as well.
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