EMERSON KJ4001X1-NA1是一种改进的GTO开关特性在所谓的“硬盘驱动器”的高功率(3 kA / 4.5 kV)下，GTO输出SOA(安全操作区域)得到了显著的改进，其中一个集成的栅极驱动器在阳极电压开始上升之前将阴极电流转换为零。

It is an improved GTO switching characteristic. At high power (3 kA/4.5 kV) of the so-called "hard drive", the GTO output SOA (safe operating area) has been significantly improved, with an integrated gate driver switching the cathode current to zero before the anode voltage begins to rise.