31221500 - Mercury relays

CPV code 31221500 in the EU Common Procurement Vocabulary refers to Mercury relays. It sits at level 5 of the CPV hierarchy as a subcategory within the 31 division. This code is nested directly under 31221000, narrowing the broader category into the specific area of mercury relays. As a leaf code, 31221500 has no further subdivisions and represents the most precise classification available in this branch — buyers should reference it directly in tender notices when the procurement primarily concerns mercury relays. Contracting authorities across the EU use 31221500 in TED notices and national procurement portals to signal that a tender relates to mercury relays.