Acronyms can be so fun...
Are you maybe referring to Portable Operator Terminals in Building Automation Systems? I've seen that term used by Siemens Building Technologies and Honeywell to describe a portable PC with BAS software installed, so that their technicians can plug into a BAS network at any point to trouble shoot it. I'm not sure how the term "cabin" would come into it however. A translation issue perhaps intended to mean a booth or something?
If so, and if by "GFCI" you are referring to a Class A Personnel Protection Ground Fault Circuit Interrupter as defined in the US National Electric Code, then the only time you might need a GFCI for a plug-in outlet is if it is in a wet (or potentially wet) environment such as a kitchen or bathroom, of if it is outdoors. The only time you need a GFCI on hard-wired equipment is if it is a swimming pool / spa or if it is a circus / carnival / amusement ride.
If you were not intending to discuss a Class A GFCI as defined in the US, then you should not use that terminology, it is very specific (despite the assertions found on Wikipedia). A Class A GFCI is set to trip at no more than 6mA, which is far more sensitive than the different levels of RCD systems sold in the rest of the world, or what we call "EQUIPMENT" ground fault protection.
"Will work for (the memory of) salami"