They are Wago 25A 2P+E connectors for the 230Vac 13A socket outlet circuit. Top left is feed from utility cupboard (runs under the raised silver trunking across the floor) , right side supplies the two outlets above kitchen worktop and the one on the outside flap. The rest of the outlets on the splitter are spare and can be used if you want to add additional outlets.You will also find black versions at various points in the van that supply the Truma heater, EHU battery charger and habitation AC.