Different country has different value of power system but same structure: such as TN-S(Single phase), TN-C(three phase), TN-S(three phase) etc.
We used the valide value to describe as Single phase value/ three phase value.
In China/Europe, it's normally 220/380VAC；and, in Malysia/USA, it's 240/415V.
According to the standard, Uc＞Un*1.15;
let's take T2-20/2P as an example,
T2-20/2P, Uc=320VAC, 220*1.15=253, 240*1.15=276.
So, CHENZHU's SPD could fully used for 220/380 V AC or 240/415V AC system.