The Phoenix Contact PV sets combine two MPP (maximum power point) trackers for surge protection.
Each individual MPP tracker is responsible for extracting the maximum power from the connected strings. The new device in the PV set can simultaneously protect two MPP trackers via two separate plus and two separate minus inputs.
Both trackers split the path to the protective conductor in the V circuit. This not only reduces surge protection costs, but also the manufacturing costs for the PV set itself. In addition, only one protective conductor connection is needed for both MPP trackers.