... the power supply such as TN-S,TN-C,TT,IT 3.Rated voltage:380V surge protector1. ... the power supply such as TN-S,TN-C,TT,IT 3.Rated voltage:380V SP2 SPD, ... suppressor/electrical surge) Detailed DescriptionAmbient Temperature: -40 ~80Altitude (max): 2,000mProtection Class: IP20Applied to TT, TN-S, TN ... -S-C SystemStandard: IEC: 61643(Surge Arrester,surge protection,surge ...