I peak A common measure, used by marketing people, to express the relative peak current handling capability (8/20us)of a surge suppression device. Frequently, it merely represents the peak current rating of an MOV multiplied by the number of MOV’s in parallel. The "true" peak current rating of a protector requires a careful assessment of the fuse characteristics, the number of parallel protection circuits, are all of them monitored etc. Bellcore specifications to protect their Central Offices, a highly computerized facility, have found and specified surge current values of 20kA, (8/20 us) waveform, to be satisfactory.