English translation: shield (with key) for glue pump computer housing
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Explanation: It most likely contains the PLC controller specifically for the glue pumps. "Enclosure" would be more appropriate. "Compartment" would indicate a section or part of an enclosed space (i.e. luggage compartment), but considering that it is already protected by a physical lock and key, this enclosure would probably be outside of the line's main electrical cabinet and located closer to the glue injectors/guns. "Enclosure" would be even more reasonable if it is one out of a series of items in that list.