When the Moebius Corps attacked the Terran Dominion space platform Sky Shield, they deployed several EMP scramblers in their attack. They were powered by solarite. The Daelaam under the command of Hierarch Artanis destroyed the scramblers and retrieved the solarite.
The EMP scrambler emits a pulse in a radius of 15 around it that damages the shields of protoss units by 0.05 every second. Destroying a scrambler earns five solarite as a bonus objective. There are three scramblers around the platform.