The pulse load graph here shows the peak power as a function of pulse duration for the PR01 series that can withstand nearly 900W for 1 µs square single pulse, as per dashed line. The same type of graph can be found in the product datasheet for the PR02 and PR03, which can handle nearly 2000W and 3000W, respectively, at the same 1 µs square single pulse. Additionally, to be used along with the pulse load graph, whichever shows lesser peak voltage, mostly applicable for high resistance values, the datasheet specifies the surge voltage curve as a function of pulse duration. The PR01 can handle 1000V, whereas the PR02 withstands 1500V and the PR03 2000V for pulse durations less than 10 ms.